128
HIGH S'PEEO RANGE atalogue H4/2 "MINOR" PRECISION LATHE Max. length between centres 20" (508 mm) Max. swing over bed . . .' 10" (254 mm) Max. swing over carriage " 5i" (137 mm)
HIGH S'PEEO RANGE
":atalogue H4/2
"MINOR" PRECISION LATHE Max. length between centres 20" (508 mm)
Max. swing over bed . . . ' 10" (254 mm)
Max. swing over carriage " 5i" (137 mm)
j I j I
1 !
•
HOlBROOK 'MINOR' High-Speed lathe
The traditional association of the name Holbrook with the ideals of craftsmanship in the sphere of precision lathe manufacture has been continued by the introduction of the 'M' range of high -speed machines. A policy of continuous research and progressive development upheld by a Company alive to the changing needs of industry and backed by Herbert resources, has resulted in the successful combination of well-proved, basic principles with the use of modern devices. The alliance has been achieved with the added advantages of contemporary design.
The 'MINOR' is, at present, the smallest machine in the range and has been designed to close the gap between the precision bench lathe and larger precision lathes such as the others in the Holbrook range. Retaining the adaptability and degree of accuracy associated with the former type, this machine inherits also the rigidity and rugged operational characteristics of the latter. The provision of infinitely-variable speeds and feeds plus the facilities for accurate threading ensure the success of this machine in the efficient production of small precision components particularly for the electrical and instrument manufacturing industries.
The easily-accessible spindle drive, housed in a well-ventilated compartment, consists of a motorised variable drive into a two-speed gearbox which incorporates an instantly-responsive clutching and braking device. Final drive is transmitted through multiple-vee belting which ensures maximum grip to produce smooth, vibrationless operation.
The headstock is manufactured from a one-piece casting for maximum rigidity and supports the 01-4" Cam-lock nosed, forged-steel spindle in prec',sion taper-roller bearings. Infinitely-variable forward or reverse spindle speeds from 80 to 3000 r.p.m. are available in two ranges through electra-magnetic clutch operation and the speed is indicated on a large tachometer mounted on the face of the headstock.
One of the many outstanding features of this machine is the conveniently-placed panel carrying controls such as the variator knob for feed rates, high or low speed range selector, leadscrew or feeds haft direction of rotation selector and a short joystick for spindle rotation control. Forward or reverse movement of this lever produces the corresponding direction of spindle and feedshaft rotation, with an efficient braking effect in the centre position. A "spindle free" position is also provided on this control.
The range of infinitely variable speeds is controlled from the handwheel .mounted on the front of the base cabinet.
The taper�turnjng attachment and the coolant arrangements illustrated are available as extra equipment.
The totally-enclosed gearbox IS used only for threading and is engaged by a push-in knob on the end of the headstock. By combination dial selection, thirty changes from 8 to 64 t.p.i. can be made. Other ranges can be supplied if requested at time of order and special threads or metric pitches obtained by change gears on an adjustable quadrant can also be arranged. Micrometer-adjustable stops facilitate length control and allow the production of threads at high speed with accuracy.
The apron, incorporating double-supported shafts, carries controls for the instantaneous and smooth face-clutch engagement of sliding and surfacing feeds. A push-in knob on the apron face can be used to increase or decrease feeds by a ratio of 6:1. A safety clutch, incorporated in the feed and threading motions is designed to prevent damage by overloading. The carriage, guided by hardened and ground raised vee and flat bedways, supports the surfacing slide which is designed to accommodate front and rear tool boxes with traverse over the full faceplate diameter. The swivel toolslide can be rotated through 360' and, as standard, is fitted with a toolblock and tool holders. Indexing square turret or drop-on types can also be supplied. Where the lathe is to be used for frequent threading operations a quick-action tool-withdrawal attachment can be fitted to the toolslide if requested at time of order. The machine is equipped with large, graduated handwheel dials which can be quickly and accurately read: each division on the apron handwheel dial represents 0·005" travel and one complete revolution gives 0·5" travel.
The rugged tailstock is fitted with a hardened steel spindle and is efficiently clamped to the bed by a lever-operated eccentric. The base cabinet. an essentially robust part of any precision lathe, is designed to satisfy this requirement and also to provide accommodation for the coolant pump (when fitted), motor drive and electrical sw·ltchgear. The doublediagonal bracing of the bed combines rigidity with good swarf clearance characteristics. The standard electrical arrangements for this machine require a supply of 380/420 volts 3-phase, 50 cycles. The control circuit uses a 110 volt arrangement. Provision is made for connections to a machine light when this is required and customer's special electrical arrangements can be considered.
The wide range of ADDITIONAL EQUIPMENT available for this lathe includes: Hydraulic Profiling, Taper Turning or Spherical Turning Attachments, Automatic Feeding and Threading Stops, Micrometer Bed Stops (Single or Turret), Collet Equipment. Indexing Flange, Rear Toolholder, Coolant Arrangements and Metric/English Travel Dials. Fully Metric machines can be supplied.
the l1olbrook 'M!NOR' Precision Lathe
Cam-lock p ,625" 15·875 mm.
Nose Q 1 �" 38'10 mm. R H' 11-11 mm. S H" 41·27 mm. T 1-4375" 36·51 mm. U 2·500" 63·50 mm. V 4i" 117·47 mm. W +t" 20·63 mm. X tt" 17-46 mm .
.. y 3 3 Z tr 16·66 mm.
Threads
Q R �
--- -r-� --!1�+- �--RsJ y/ /' "" "" -G6� }cl: U V lA DIA D
Y HOLES REAM Z DIA
60
100
90
Id. �.
ir It:�
Range
Headstock
Gearbox
Tailstock
Overall Dimensions
Weights
Standard Equipment
Length between centres Height of centres above flat way Swing over bed Swing over carriage Top slide travel Max. Tool section
N umber of spindle speeds "Range of spindle speeds r.p.m. Motor H.P. Spindle bore diameter Centre sleeve bore taper (Morse) Cam·lock spindle nose "Alternative speed ranges available to special order
Number of pitches Range of pitches t.p.i. Number of feeds Range of feeds (independent) Leadscrew diameter Leadscrew t.p.i. Leadscrew nut length
Quill diameter .. Quill travel Merse taper of bore
Approx. It:llgth width height
Standard lathe and equipment Standard lathe and equipment (boxed) "
Knock�out Bar, Operator's Instructions,
'MINOR' PRINCIPAL DATA
20" (508 mm.) 5" (127 mm.)
10" (254 mm.) 5." (137 mm.) 2�" (57 mm.)
-!" x f" (13 mm. x 9 mm.)
(Infinite) 80-3000
3-960 r.p.m. 11;" (29 mm.)
No. 2 DI-4"
30 8-64
(Infinite) 1<" -8" (6-203 mm.) per min.
1" (25 mm.) 8
2" (51 mm.)
Oil Gun,
1 I,' (32 mm.) 4" (102 mm.)
No.2
5' 6" (1676 mm.) 2' 5" (737 mm.)
3' 11" (1194 mm.)
1680 lb. (760 kg.) 1950 lb. (890 kg.)
Necessary Wrenches
INDEX
General View of the 'MINOR' Lathe Pr incipal Data
INSTALLAT ION SE CTI ON
Cleaning Ele ctrical Conne ction Foundation Inspe ction Report Levelling Lifting W e ight
Illustrati ons F ig . l General View of the Lathe Fig . 2 Foundation Diagram F ig . 3 F itting the Special Jack F ig . 4o The Watts Pre cision 12 " Blo ck Level
Method of Levelling F ig . 5 Fig . 6 Fig . 7 Fig . 8
Part of the Ins pe cti on Report Ele ctri cal Panel
& 9 Wiring Diagrams
LUBRICAT ION SE CT ION
Ap r on Filt e r , Gearbox Headstock Kopp Unit Leader End Thrust Mounting Lub ricating Oil Saddle Tailstock T o p Slid e Va r ii',to r Unit Vis co s ity
III u s t ration
Fig . 1 0 Oilin g D iag ram
. . ',
PA GE N O.
7 & 8 9
10 - 17
12 13
10 & 11 14 12 11 11
7 10 11 12 13 14 1 5
1 6 & 1 7
2 1 20 19 19 2 0 2 1 19 2 1 2 1 21 2 0 19
18
1
2 INDEX
DESIGN 8. CAPACI T Y SECTI ON
(Note: I n this se ction much of th e equ ipment I nstru ctions for operation of th e main items s e ction ) .
Apron Automatic Length Control Stops Base Cabinet 8. B ed Cabinets (Tool) Cam- lock No se D imensions Capa city Carr iage Centr e Dimensions Chas ing Attachment Drive Equipment Cabinets Extra Equ ipment Follow Steady Gearbox Headstock Hydraulic Pr ofiling Equipment Leader Thru st Compensation Unit Multi-Index Plate Multi-tool Holde r Steadies Swing T ailstock T aper Turning Attachment Thr ead Chasing Atta chment Thr eading Dial Thr eads Three -point Steady Thru st Compensation Unit Tool Cabinets
i s mer ely descri bed. ar e given in th e subs equ ent
PAGE NO.
2 3 - 24
2 6 3 1 29 3 3 24 24 2 6 24 3 1 25 3 3
30 - 34 32 2 6 25 3 0 2 8 32 32 32 24 2 8 3 1 31 34 24 32 2 8 3 3
INDEX
DE SIGN AND CAPACITY SECTIO N (cont'd. ) Illu s trations F ig . 1 1 Main Controls Fig . 1 2 Final Dr ive & Gear Tr ain Fig. 1 3 Standard Apron & Carriag e with s ome Fig . 1 4 Standard T ailstock F ig . 1 5 Bed Stru ctur e Fig. 1 6 Pr ofiling Equ ipment Fig. 1 7 Thr ead Chasing Equipment Fig. 1 8 Th e Tri-pan Toolh older Fig. 1 9 Multi -index Plate Fig . 2 0 Th e Univer sal Cabinet
O PE RATION SECTION
Alignment Ch eck Appr oved Cutting Emu ls ions Automatic Length Control Stops Change Gear s Ch as ing Attachment Copy Turning Cutting Flu id s Diametr al Pitch e s Feed Control Formulae General Pr ecautions Contr ol of F e ed Contr ol of Spindle Rotation Control of Spindle Speed Hydr aulic Pr ofiling Metr ic Thr eads Module Pitch e s Pr of iling
Accur acy Blending Cau s e s of Faults Commis sioning th e Unit C ontrol Valve Facing Beam
3
PAGE NO .
2 3 2 6
extr a s 2 7 2 8 29 3 0 3 1 32 32 3 3
35 - 73
3 6 6 7 64 41 49
47 - 63 66 - 69
43 39 42 35 39 3 7 3 8
47 - 6 3 4 1 & 44
44 47 - 63 55 & 57
54 59 52 47 52
4 INDEX
OPE RAT ION SE CTION (cont 'd . )
Pr ofiling (cont 'd. ) Faults. Cause s and Remedies Fitting to Lath e Fo rm Turning Limitations General Periorm2.nce Hyd raulic C ircuit Limitation of Form Turning Maintenance Measuring Slide Fr iction Operating Profile Unit P ump
,Set
Rear Beam Remedy of Faults Respons e Accuracy Retraction Handle Scr ew Cutting Slide Ass embly Specification Stylus Lever Toolbox
Spe cial P itche s Spindle Speed Control Spindle Rotation Control T aper T urning T hr ead Chas ing Attachment T hr e ad Cutting Instruct ions Thr eading Dial T urning T est
I llustrations Fig. 2 1 T urning T est o f Alignment Fig. 22 Movement of Joystick-type Swit ch Fig . 23 Layout of Control P anel Fig. 24 T he Control P anel Fig. 25 Gearbox Contr ols Fig . 26 Standard D iame tral Pit ches Fig. 2 7 Standard Metr ic & Module P itches
42,
PAGE NO .
59 52 5 7 55 5 1 5 7 5 7 5 7 54 52
52 & 58 52 & 5 1
59 55 49 55 47 5 8 4 7 49 41 38 37 65 45 40 42 36
36 3 7 38 39 40 43 44
OPE RATION SECTI ON (cont 'd . ).
INDEX
Fig. 2 8 T he T h read Chasing Attachment Fig . 29 Rear View of Thread Chasing Attachment (rais e d ) Fig . 3 0 Pipe Connections on Hydraulic Prof iling Unit Fig . 3 l Hydraulic Circu it f o r Prof iling Equ ipment Fig . 32 Shaft Tu rning Fig . 3 3 Blending Machin ing Fig . 34 - 37 Form Tu rning Limitations Fig. 3 8 The P r of ile Unit Fig . 39 ' T a ils tocks Fig . 4 0 T he Hydraulic Power Unit Fig.4l The Prof iling Toolholde r Figs . 42 , 43 & 44 Automatic Length Control Stops Fig . 45 T ape r Tu rning Attachment
MA'NTENANCE SE CT ION
Belt T e ns ion Adjustment Gearing Arrangement Headstock Spindle Bear ing Adjustment Independent Feed Motor Kopp Variator Unit
Adjustment Ass embly Dismantling
Leads c r e w T hrust Adjustment Saf ety Clutch T wo Speed Gearbox Wo rking T empe r ature of Var iator
Illustrations F ig . 46 Rear View of Lathe Fig . 4 7 Gearing Arrangement Fig . 48 The Kopp Var iator
5
PAGE NO.
45 46 4 8 5 0 5 3 5 3 5 () 6 0 6 1 62 63 64 6 5
70 7 3 70 7 0 72 76 74 74 72 72 72 72
7 1 7 3 7 7
PRINCIPAL
Range
Headstock
Gearbox
Tailstock
Overall Dimensions
Weights
Standard Equipment
HOLBIlOOK 'MINOR' PRECISION LATHE
DATA
Length between centres Height of centres above flat' way Swing over bed Swing over carriage Tap slide travel Max. Tool section
Number of spindle speeds Range of spindle speeds r.p.m. Alternative speed range f.p.m. Motor H.P. Spindle bore diameter Centre sleeve bore taper (Morse) Cam· lock spindle nose
Number of pitches Range of pitches tp.i. Number of feeds Range of feeds (independent) Leadscrew diameter Leadscrew t.p.i. Leadscrew nut length
Quill diameter Quill travel Merse taper of bore
Approx. length . width . . height .
Standard lathe and equipment . . Standard lathe and equipment (boxed)
Face-plate, Knock-out Bar, Operator's Instructions,
9
20" (508 mm 5" (127 mm
10" (254 mm 5i" (137 mm
21" (57 mm !" x j" (13 mm. x 9 mm
Oil Gun,
,. �.
(Infinite 80-300( 80-400(
3-960 r.p.m 1�" (29 mm.
No. : DI-4'
3C 8-64
(Infinite) -1:"-12" per min
1" (25 mm.) C
2" (51 mm.)
1-1:" (32 mm. 4" (102 mm.
No ..
5' 6" (1676 mm. 2' 5" (737 mm.
3'11" (1194 mm.
1680 lb. (760 kg. 1950 lb. (890
, kg.
Necessary Wrenche
, 7" 3-(10 92·2mm)
3'- 11" (11 94 mm)
HOLBROOK 'MINOR' PRECISION L A THE
f---------,- S�3r _______ "'1 663-7mm) S·
(1 27mm)
I� In """.�nmllL7Z�_._-_ 3'-32 ----+l_J,.--(SO'8mm) (1008'3 mm)
(SO'8mm) S'·O"
\------- --------4 I. (IS24mm) 2�4:j 2 0· r--<s08mm) �-;--I (717· SSmm)
� IJ!i!
�
a..,.,
b
,-J
I 11 c� q r ". 11 I: 1?_ :1 , __ .....J
Ii .JfIf � "\JI/ -� ., I---
-4> I�r+ If Iv-rr � I,
Lm,' C U
�
I' 3'-3 Z (1008'3mm)
3.J ',....7;; (196' 8Smm)
1 0
2" (SO'8mm) 2"
(SO·8mm) Fig . 2 Foundation Dia gram
INSTALLATION
Fig . 3 Fittin g the Special J ack
LIFT ING T HE MACHINE
The approximate weight of the 'Min or ' lath e is 1St cwts ( 760 kg) .
A liftin g jack has be en d e,o eloped by th e makers spec ifically for us e wh en ins tallin g or movin g this lath e . This devic e, illustrated in Fig . 3, is available for h ir e on r equ est an d its use is str on gly r ec ommen d ed . Th e top plate of th e jac k should be plac ed on th e bedways of th e lath e clos e to th e s pin dle n os e with pr otectin g c an vas pads between th e surfac es . Th e lock bolt , pass in g through this top plate , c arries a 1. 5/8" Whit . thr ead on its lower en d an d on this th e bottom plate should be affixed to bear firmly on th e underside of the bed. The machin e should be c arefully lifted an d the state of balance asc ertain ed . Slight tiltin g can often be corrected by slight r e-position in g of the s addle an d tailstoc k.
FO UNDATION
An e laborate or spec ial foun dation is not n ec ess ary for th e installation of th e Holbrook ' Min or' Lath e . A level c oncr ete s ite approx. 4 " in depth will be adequ at e .
The actu al floor s pac e requ ired an d th e pos itions o f th e levellin g bolts ar e sh own on th e foun dation diagram (Fig . 2 ) .
11
12 HOLBROOK 'MINOR' PRECISION LATHE
C LEANING
On d e s patch from the make r s , all bright and machin ed su rfaces are covered with a ru st preventative. Befo re any machin e m em b e r s are moved this protection should be rem oved with wipers soaked in paraffin o r petrol and the m achin e levelled and thoroughly lu bricated.
Particular attention should be paid to the cleanin g of the lead e r. Greas e left on this component m ay be carried into the follower and either bl o ck the oilways which feed lubricant from the apron to the follower or a s s ist the in g r e s s of swarf and con s equ ent s c o ring of the lead e r .
LE VE LLING T HE MACHINE
The u s e of a Watt s Precision 12" Blo ck Level (F ig. 4) is recomm end ed. This in strum ent has a s en s itivity of 10 s e cond s per d ivi s ion which is equal to a grad ient of 0. 0005" per 10 in ches o r 1 in 20,000. T he refo r e by e stim atin g on e fifth of a d ivis ion on the tube (which is quite feas ible ) , a deviation from the ho rizontal of a s little a s 1 in 100,000 m ay be obs e rved .
Care should be taken that the vial of the in s trum ent i s not tou ched with the hand , otherwi s e a local in c r e a s e in temperatu re might be su stained which could affe ct the read ing .
The lathe which i s fitted with fou r levellin g s c rewS should be initially levelled lengthwi s e . The n ext and most im portant step is to elim inate cros s-wind o r twist in the bed . T he level should be po s itioned on parallel strips to straddle
Fig . 4 The Watts Precis ion 12" Blo ck Level
INSTALLATION SECTION
Fig . 5 Method of Levelling
the bed as clos e to the heads tock as poss ib le (Fig. 5 ) and the levelling s crews at that end of the machine adjusted to obtain a level reading . T he strips and level s hould then b e transfe r r ed to t he extreme tailstock end and the s c rews at that end us ed to obtain a s imilar reading .
It may b e found that the b as e of the machine is clear of the floor and uns upported b etween jacking points . T herefo r e , slow taper (0 . 01 0 " t o an inch) wedges s hould b e ins e rted front and rear . T he us e of wedges is recommended even if the machine is to be g r outed in.
Finally the levelling procedure s hould b e r epeated to check readings in each pos ition.
E LE C T RICAL CONNE C TI ON
The standard ele ctrical arrangements fo r this machine require a s upply of 440 volts 3 phas e, 5 0 cyc les . The.v control circuit us es a 110 volt arrangement. Provis ion is made for connections to a machine light when this lS
re quired and c ustome r 's s pecial elect r ical arrang ements must b e cons id e red .
The is olator in the cab inet at the headstock end of the machine s hould b e connected to the mains supply. Care must b e taken to ensu re that the conduit e ntry port is completely sealed against the ingress of s warf, dust and mo is ture.
T he machine is energis ed by switching the isolato r lever at the headstock end (Fig. 7 ) to the ' ON' position. This will caus e the illumination of the g reen light in the centr e of the main control panel to indicate that power is available at the machine .
13
14 HOLBROOK 'MINOR' PRECISION LA THE
HOLBROOK MACHINE TOOL CO. LTD. Model.. INSPECTION REPORT
No ..... . ALL MODELS
Bed, to be levelled transversely . " ... ... . " .. . .. .
Spindle, Parallel with Top of Bed, or rising towards free end
Spindle, Parallel to Front of Bed or inclined towards tool pressure
Spindle axial float . .. ... . .. ... . " ... . ..
Spindle nose to run true . .. .. . ... . .. .. .
Centre point to run true . " . .. . . . ... .. . ...
Centre sleeve hole in. Spindle. Check with standard test bar, at nose
Centre sleeve hole in Spindle. Check with standard test bar, 12" out
Faceplate to be correct or concave ... . . ' .. , ' .' .. , . . '
Tallstock plunger parallel with Top of bed or rising at centre end. Plunger fully extended ... ... .. . . ... . . . .
Tailstock plunger parallel with Front Bed or inclined towards tool pressure ... ... .. ' ... . . . . .. ... .. . . ..
Taper bore of plunger parallel with Top of Bed or rising towards free end ," ," ," ," .. ' .. . . . . . . ' . "
Taper bore of plunger parallel with Front of Bed or inclined towards tool pressure ... ... . .. ... . .. . . '
Tailstock centre to be same height or higher than Fast Head
Leadscrew, vertical and horizontal alignment with Bed
Leadscrew deflection, vertically and horizontally when closed, Carriage in centre of Bed . .. .. . ...
Leadscrew, Pitch error over any 3" . . .
" " " " " 12" . ..
Nut . ..
. ..
.. ' " " " " " total length equals, feet times
Turning Test
Round Turning in Chuck, Maximum ovality . . ,
Parallel turning in Chuck . ..
All Limits et 68· ".
. . .
...
is
.. .
.. ,
.. '
Permissible Error
(in inches).
.0005" per 3ft.
o to .0004" per ft.
o to .0002" per ft.
.0002"
.0002"
.0004"
.0003"
.0006"
o to .0005"
per ft. dia.
o to .0008"
o to .0002" per ft.
o to .0008" per ft.
o to .0004" per ft .
o to .0008"
.004"
.006"
.0003"
.0005"
.0005"
.0001"
.0003" per ft.
Batch No .....
Cons. No ....
Permissible Error
(in m/m) .
. 0137 per metre
o to .0098 per 300
o to .UO 19 per 300
.005
.005
.01
.0075
.015
o to .0074 per
300 dia.
o to .02
o to .0049 per 300
o to .0197 per 300
o to .0098 per 300
o to .02
.10
.15
.0075
.0125
.015
.0025
.0197 per 300
I
Recorded Error
I Fig . 6 Part o f the ins pection repo rt completed befo r e d espatch of the lathe.
A copy o f this should be received by the custo m e r .
INSTALLATION SECTION
HOLBROOK MACHINE TOOL CO, LTD, Model..
No ....... .
INSPECTION REPORT
ALL MODELS
Penn.laaible -
(iD iDehe.).
Bed, to be levelled transversely . .. . . . . . . ... . " . . . .0005' per 3ft.
Spindle, Parallel.lllith Top of Bed; or rising towardS free end o to .0004' ... per ft .
Spindle, Parallel to Front of Bed or inclined towards tool pressure o to .0002' per ft.
Spindle axial !loat .. ' ... ... .. . ". . . . .. . . .. .0002'
Spindle nose to run true . . . .. . ... ... . .. . " . U' .0002'
Centre point to run true . . . .. . ... . .. . . . ." . .. .0004'
Centre sleeve hole in, Spindle. Check with standard test bar, at nose .0003'
Centre sleeve hole in Spindle. Check with standard test bar, 12" out .0006'
. . ... .
Faceplate to be correct or concave ... .. . '"'' . . . . ,. .. . o to .0005'
per ft. dl •.
Tai1j!�g���"; =d� wi� Top.��})".�.
or rising a�.�en� .. nd .... o to .0008"
Tailstock plunger parallel with Front Bed or inclined towards tool o to .0002' pressure . .. . .. ... ... .'., ... . . . . " . .. per ft.
Taper bore of plunger parallel with Top of Bed or rising towards o to .OOOS' free end ... .. . ... ... , . .. .. . ... .. . ... per ft.
Taper bore of f
lunger parallel with Front of Bed or inclined o to .0004' towards too pressure .. . .... . .. ... ... .. . . .. per ft.
Tailstock centre to be same height or higher than F!l;! Head .. . o to .OOOS'
Leadscrew, vertical and horizontal alignment with Bed ... ... .004'
Leadscrew deflection, vertically and horizontally when Nut is .006' closed, Carriage in �entre of Bed ... ... ... ... . . .
Leadscrew, Pitch error over any 3" ... ... .. . . . . .0003'
" " " " " 12" ... ... .. . .. , ... .0005'
" " " " " total length equals, feet times .0005'
Turning Test Round Turning in Chuck, Maximum ovality . .. ... .. . .0001'
Parallel turning in Chuck '" .. . ... ... . . . . . . .OOOS' per ft.
All Limits at SS'F. .
Botch No ....
Cons, No ....
Permtaaible
� lCrrw (in m/m) .
. 0137 per metre
o to .0098 per 300
o to .00 19 per 300
.005
.005
.01
.0075
.015
o to .0074 per 300 dia.
O'to .02
o to .00-19 per 300
o to .0197 per 300
o to .009S per 300
o to .02
.10
.15
.0075
.0125
.015
.OO� ~ .0197 per 300
..
I I Fig. 8 . Part of the inspection report completed before despatch of the lathe.
A copy of this should be received by the customer.
17
HOLBROOK MODEL "H" PRECISION LA THES
. . . : .. .
, .
. : : .
. : .
:: ::"
� .
. : .
18
INSTALLATION SECTION
Fi g . 7 Elect rical Panel
,::::Uj ,,[u: .,-:�r-" �F,S�
15
Befo r e operating the machine to c hec k the di r ection of s pindle ro tation, the lubric ation requ ir ements as desc ribed in the follo wing s ection of this bock s hould be fully met .
The direc tion of s pindle rotation should be in acco rdanc e with the r elevant s ymbo ls o n the front control plate , i. e . fo rward rotation should be ant ic loc kwis e and r e v e rs e rotation c lockwise when vi ewed from the t ailstock. This be ing co r r ect , other mechanisms, including coo lant pump when fitted , will be co r rect . If the spindle is found to run in the wrong direction, the leads into the iso lato r must be r eve rs ed.
HOLBROOK • MINOR' PRECISION LA THE
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INSTALLA TION SEC TION 17
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18
OIL S IGHT GLASS.
HOLBROOK • MINOR' PRECISION LA THE
PRESS TO OIL
IS TIMES DAILY.
OIL FILTER.
OIL RETURN FROM
HEAD STOCK & GEAR BOX.
(£) USE SHELL ENSIS 30
@ DRAIN PLUG.
FILTER CLEAN EVERY TWO WEE KS.
OIL FILLER FOR
TWO SPEED
GEAR BOX,
HEADSTOCK & GEAR BOX
USE SHELL
TELLUS 29
-t1�!tl:¥�t=t��REDUCTlON UNIT.
KOPP VARIATOR UNIT.
MAIN OIL FEED TO
HEAD STOCK & GEAR BOX.
Fig. 1 0 Oiling Diag ram
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, , ( ",
r " \ .-----..-..... ' . ....--..-.-. __ ._--,-,._--_._. -
LUBRICATION Befo r e the lathe is u s ed , e ac h unit mu st be carefully and c o r r ectly
lu bric ated. T he ope rator should make him self familiar with the po s ition and requ irements of all lu brication points (s e e Fig . 10) and asc ertain that they rec eive r e gular attention.
Henc eforth, lu brication of the machine mu st be c ar ried out at frequ ent inte rvals and with unfailing regularity.
At least 800/0 of repairs and replac ements on machine tools , are du e to lack of lubrication . Many of the lar g e r and mo re e fficient production shops recognise this and find the solution in removing the re sponsibility of machine lu bric ation from the ope rator and plac ing it in the hands of a central lu bric ation s e rvicing body. T his body, operating on a planned schedu le , ensu reS that every u nit in the entire plant r ec eives c o r r ect and r e gular lu brication.
The outlay involved on this scheme will qu ic kly be r ec ove red by the saving in time , material and man hou r s , with the near elimination of s e izu r e s and breakdowns in the plant through inadequ ate lu bric ation.
LUBRICATING OIL
T rouble s are s ometimes encountered owing to the u s e of inferior oils
19
in mac hine tool s . If animal or vegetable oil is u s ed , gummy products du e to oxidation are formed. Soap, which is s ometime s u s ed to thicken the oil, tends to produc e a depo s it by dec omposition. Such depo s its will u sually choke both the filt e r and pump, c au sing a breakdown in the lubric ating system.
Oil for h eadstocks, feed boxe s and for general lu brication of machine tool s , should c on s ist of pu re mineral base o il with no vegetable of animal oil , o r any form of soap o r s olid matter such a s g raphite in su spension.
The visc o s ity of a lu bricating oil is of vital impo rtanc e . If the oil film is too thin, it breaks down und e r pre s su r e c au s ing wear; if too thick, a heavy s tres s is impo sed upon the pump and in cold weath e r parts of the mac hine which are r emote from the pu mp will b e inadequ ately lub r ic ated .
Whe r e the machine is u s ed in a cold c lim,.te the temperatu re at which the oil s ets to a s emi-solid mass i s impo rtant.
HEADS T O C K AND GEARBOX
The mac hine incorporate s a p r e s su rised lubric ation system which , having been drained for transport from the make r s , will require refilling on installation. The r ec o mmended lu bricant is S hell T ellu s 29 or equ ivalent oil.
20 HOLBROOK 'MINOR' PRECISION LA THE
Removal of the cover at the lower rea r of the ma chine will allow a c c e s s t o the res ervoir filler whe re the level o f oil should b e regula rly inspected before the ma chine power is switched on and preferably afte r the ma chine has been sta nding idle fo r at lea st thirty minute s . This precaution will ensure the time required for the oil to drain ba ck and thus will avoid overfilling.
The r e s e rvoir oil level should be just b elow the top of the fille r spout and , under no rmal working conditions , will b e found to require 'topping up ' approximately every two weeks.
The level indicated by the oil sig ht on the f ront of the h eadstock s hould also b e regularly ob s erved .
A filt e r , cons isting of magnetic and gauze elements, is fitted in the sy stem and is eas ily a c c e s s ible at the rear of the headsto ck. Removal of the unit (by uns crewing ) will cause the e s cape of a quantity of oil and care should b e taken to replenish the sy stem on repl acement of the filter before the la the is used. Initially the element should b e removed and washed in paraffin af ter approximately three day s u s e; sub s equently it should b e cleaned every fortnight.
At approximately s ix -month intervals the sy stem should b e completely drained and replaced by fr esh oil of the correct grade.
The flow of oil should b e ob s e rved through the s ight glass fitted to the top right-hand front face of the gearbox. Approximately one to two minute s may elapse after the ma chine is started b efo re oil is s e en flowing; if this period is greatly extended, the powe r to the machine should be switched off and an inve stigation made .
K OPP VARIAT OR UNIT
A spe c ial lub ricant "Mob ilfluid 62" is s upplied for use with this unit and it is vital that the correct level is ma intained.
Do not overfill. T he level of the o il should never b e above the centre of the oils ight when the variator mechanism is stationary . Failure to use the
I l .
I , I
c o r r e ct quantity or the spe cified quality of oil will se riously impair the efficiency ( . of the unit and may cause permanent damage .
T he variator unit should b e drained , flushed out with the spec ial oil a nd re -filled to the correct level with fre s h oil after the initial 100 hours of ope ration. Sub sequent drainage , flushing and changing of the oil is recommended at 1 00 0 -hour interval s .
LUBRICATION SECTION 21
The oil level should be inspected at regular int e rvals with the variator stopped; s eriou s damage w ill be inevitable if the re is insufficient lu bricant. At each inspection. it should be as ce rtained that the breather hole , in the top of the output e nd co ver , is f r ee of obstru ction.
APRON AND SADD LE
Shell "Ensis " 30 oil o r equ ivalent should be u sed in this unit.
Lubricant should be applied throu gh the filler on the top face of the unit until the correct level indicated on the sight glass on the front of the apron is attained . Ove rfilling will cause leakage.
From the apron r e s e rvoir, oil is distributed thr ou g h the unit by a ctu ation of a hand -operated pump plunger on the apron fac e . T his s hould be depres sed approximately 15 time s daily, preferably before commencement of work.
The apron should be d rained and replenished with fresh oil of the correct g rade every six months .
OT HE R P OINTS , including the leader end thru st mounting , the top slide s crew and the tailstock me chanisms etc . , should r e c eive occasional attention u s ing Shell "Ens is" 30 o r equ ivalent applied by oil gu n .
SP�)ID LE: SPESD
r ACHOl\lSTER
GS, .. \RBO:\ E::JG.:',GE.\;';:::'iT
HCADSi,:::<c: ,.)(:.... !......::::�n:::.:..., �>:�lCAT,JR
LEV:::'P .
.?i T CH SE L.::: eT >:.YN l;"�r �;:'
SW��CH
FEED CONTROL
:eE:ED W . .l,.R NINCi ;"'GHT (RSD)
MAINS W .. --\RNING LIGHT (GREEN)
DESIGN & CAPACITY
INFINITELY - VARIABLE SPEED CONT ROL
SP�NDLE ROTATiON CONTROL
FEED DlRECTION
SELECTOR
SPEED RANGE SELECTOR
FOR ''IV ARD / REVERSE LEADER CONTROL
Fig . 1 1 Main Controls
This s e ction is intended to aquaint the operator with the dEls ign features and operational capacity of the Holbrook 'Minor ' lathe . This machine is
23
the product of many years experience in the d evelopment and manufactu re o.� p r e cision lathes . While many of the controls will be found to be natur<ll and ins tinctiv e to us e , it is ess ential that the ope rator should be fully awaT e of the many advanc ed features incorporated in the lathe .
24 CAPACITY A STD. BED.
Centres
Swing
Cam-lock Nose
Threads
A D E F G H I J
K L N 0
p Q R S T U V W X y Z
�
F SIZE OF CAMLOCK I
MORSE TAPER
JDIA
k -I+ll>'-. D DIA
P TAPER PER FOOT INCLUSIVE
'MINOR'
English Metric 20" 508'00 mm, ,700" 17·78 mm.
DI-4" DI-1 01·6 mm, 4" 101·60 mm. 2." '57·15 mm. No. 2 No. 2 1 t" 28·575 mm.
10" 254·00 mm. 5i" 136·52 mm. 5" 125·41 mm. 5" 127·00 mm.
'625" 15'875 mm. 1 i" 38'10 mm.
. r.-" 11·11 mm. 1 i" 41·27 mm. 1'4375" 36·51 mm. 2·500" 63'50 mm. 4i" 117-47 mm. tt" 20·63 mm. tt" 17·46 mm. 3 3 #" 16·66 mm.
c::::::J
�TRAVEL G
TRAVEL
I MORSE TAPER
I I I I I I I
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N TR AVEL
Q R �-
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Y HOLES .IIL --le.
REAM Z DIA
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DEIIBN AND CAPA CITY IECTION 2 5
The 'MINOR ' i s at pre s ent, the smallest machine i n the ' M ' range and has been d e si gned to close the gap be twe en the pre ci s ion bench lathe and larger pre ci sion lathe s su ch as the oth e r s in the Holbrook range . Retaining the adaptability and de gree of accu racy associated with the fo rme r ty pe , this machine inhe rits also the ri gidity and ru gged operational characted sti c s of the latte r. The provi sion of infinitely- variable speeds and feeds plus the facilitie s for accu rate threading ensu re the su cces s of thi s machi ne i n the effi ci ent produ ction of small preci sion "omponents parti cularly for the ele ctri cal and instrument manufactu ring indu stries.
HEAD ST OC K
The he adstock i s m anufactured from a one -pie c e casting fo r maximum ri gidi ty and supports the harde ne d and g r ound forged steel spindle in pre cisi on tape r rolle r bearings whi ch are pre -loaded during a s s embly to give optimu m pe rformance . A ce ntre , chu ck o r faceplate can be qui ckly and accu rate ly located on the Dl. 4" Cam-lock nose of the s pindle.
Infinite ly -variable forward or re verse spindle s pe eds from 8 0 to 3 000 r. p . m. a re available in two ranges throu gh ele ctro -magneti c clutch ope ration and the s peed i s indi cate d On a large ta chomete r mounted in the face of the he adstock.
One of the many outs tanding fe atu re s of thi s machine is the conveni entlyplaced pane l carrying controls su ch a s the variator knobs for spee d and feed rat e s, hi gh or low s peed range se lector , le ads c r ew o r feedshaft di r ection of rotation s ele cto r and a s hort joysti ck for spindle rotation control. Forward or rev e r s e movement of thi s leve r produ c e s the corresponding di re cti on o f s pindle and fe eds haft rotation, with an e ffi ci ent b raking e ffe ct in the centre position. A "spindle free" position i s also provided on thi s control.
T he s e controls are de s c ribed in more detail in the "Operation" s e ction of thi s book.
D RIVE
From a constantly running motor ( 1 440 r. p. m. ) the--d rive is taken throu gh a K opp variator to a two -speed gearbox whi ch incorporate s instantly r e s ponsi ve ele ctro -magneti c clutche s and a b raking de vi ce . Final drive to the s pi ndle is throu gh multi -rib bed ve e b e lti ng speci ally de si gne d for maximum power transmis si on and stnooth, vibrationle s s operation.
The whole of the moto r dri ve , hou sed in a well ventilated compartme nt i s desi gned as a unit to simplify mai ntenance and i s easi ly acce s si ble.
2 6 HOLBROOK 'MINOR' PRECISION L A THE
F ig . 12 Final D rive and Gear T rain
GEA RBOX
T he totally-enclo sed gearbox is used only for thr eading and is engaged by a push-in knob on the end of the headstock. By comb ination dial sele ction, thirty change s from 8 to 64 t . p. i. can b e made . Other range s can be supplied if r eque ste d at time of ord e r and spe cial threads or m etric pitche s , obtained by change gears on an adjustable quadrant, or the supply of a full metric gearbox can also b e arranged. See Threadcutting detail s in the "Operation" section of thi s b ook.
A P RON A ND CA R RIA GE
The apron which is a totally-enclos ed unit driven eithe r by the inde pendent feed motor o r by the threading gearbox in conjunction with the leader nut , inco rporates double- s upported shafts and ca rrie s controls for the instantaneous and smooth face -clutch engagement of sliding and surfa cing feeds . A push-in knob on the apron fa ce can b e us ed to incr ea s e a r decrease feeds by a ratio of
6 : 1 . A safety clutch, incorpo rated in the feed and threading motions is des igned to prevent damage b y overloading.
T he carriage , guided by hardened a nd g round rais ed vee and flat bed ways , supports the s urfacing s lide which is des igned to ac commodate front and
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PC Lt.. '"JUT ,(."\'00 ro DiSENGAGE RACK
DESIGN AND CAPA CITY SECTION
iJ tu! R.-'l.fU) FE.20 K;"J08
."PR');" )lL
. �.PRON OlL
DRAiN PLUG
DC:T:\C-L�]L\:: SQl:.-l.lfE: rC,_)l .. i{I)L.CH:r·: (r:�.'\rltA)
SLIDING &: SURF.-\C::<G .
FEED CONTROLS
LEVEL LND[CATI)R PC�,IP PLUNGER
30\/ .c,',V: \'�i.. r')<)L;:....:J2
.-'l.OJCSTA3LZ
;:J:.-\LS
F ig. 1 3 Standard Apron and Carriage with Three- point Steady and Square Turret (extras )
rear toolboxes with traver s e over the full faceplate diamete r . The slide is fitt ed with a wear adjustment device. The surfacing s creW is supported in two thrust bearings and the saddle can be clamped .
2 7
The 3 600 swivelling toolslide i s also provided with a means of adjustment for wear and, a s standard, is fitted with a pillar-type toolbox. Square turret o r drop-on toolt- oxes can also be supplied . Where the lathe is to be u s ed for fr equent threading operations a quick-action tool-withdrawal attachment c an be fitted to the toolsli. de if reque sted at tim e of o rde r . The machine is equipped with larg e , g raduateu handwheel dials which can be quickly and accurately read : each divis ion on the apron handwheel dial represents 0 . 005" trav el and one complete rev olution g ives 0 . 5" travel.
2 8
TAILST OCK
HOLBROOK 'MINOR' PRECISION LA THE
•. ,' LoO [',.le :::, [llcD
'� L.\,\\ P 1�,: \ ' E lt
' ::" · · · .; r .".,,u:
---"--_ DL)\- ;::, .-\ ' L Z D
3.-.';<:
:"::.".':' :;; '[ �'!-lRl;3T �':J : : ?!:�::jA:',G" -: :[T
0664
Fig. 1 4 Standard T ailstock
T h e standard tailstock, illustrated in Fig . 1 4, accommodat e s a No . 2 Mo r s e taper centre which is automatically ej ected when the hardened steel quill i s fully r etracted. T he quill has a stroke of 4 " and is controlled through a sc rew and handwheel. T he knurled handwheel is fitted with a barrel-type knob for rapid o pe ration and the collar of the wheel carries an adjustable microm eter-graduated dial.
Lar ge easily-ope rated lever s are arranged for quill to 'tailstock and
tailstock to bed clamping . The dovetailed bas e of the tailstock allows a generous degree of set-over for the produ ction of som e tape red wo rk.
LEAD E R T HRUST C OMPENSAT ION
The lathe is fitted with a leader thrust com pensation unit. T his patented d evice absorbs and nullifie s thrust on the face of the lead e r .
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DESIGN AND CAPA CITY SECTION 2 9
Fig. l S Bed Structure
BASE CABINE T AND BED
The robust base of this machine provid e s accommodation for the coolant pump (when fitted ) . the motor drive and ele ctr ical switchgear. T he top face of the base is designed for fast drainage of any coolant used and to allow easy removal of swarf.
T h e swarf problem has also received special cons ide ration in the d e s ign of the bed which. with double -diagonal bracing. combines rigidity with minimum impedance of swarf.
3 0 HOLBROOK 'MINOR' PRECISION L A THE
Fig . l 6 Profiling Equipment
EXT RA EQUIPMENT
The inhe rent accuracy and g eneral rigidity of Holbrook lathes allow the use of a wide range of attachment s without detriment to prec ision. Some of the s e attachments are illustrated and d e s cr ibed in the following pag e s .
HYD RA ULIC PROF ILING EQUIPMENT
Various types of profiling equipment can be supplied . The Hepworth T ype 1 5 0 Hydraulic Unit is illustrated and des cribed in this book. T his equipment is primarily de s igned to give low cost production of small components with a high degree of accuracy.
A univ e rsal mounting arrangement make s this equipment capable of longitudinal copy turning at e ithe r a 60
0 or 90
0 angle of approach according to the
work required . Face profiling is pe rformed with the unit s et parallel to the lathe axis , utilising a facing beam to s e cure flat template s to the saddle extens ions .
F itting of the eq'tipment in no way int e rfe r e s with the normal operation of the lathe . Detailed instructions are g iven in the ' Ope ration ' s e ction of this book.
DESIGN AND CAPACITY SECTION
F ig . l 7 T hr ead Chas ing Attachment
T HREAD CHASING ATTACHMENT
The Holb rook Chas ing Attachment Fig . 1 7 , has been developed for the e c onomical production of ac curate fine pitch threaded c omponents on the 'MINOR' lathe . Easily s et and s imple to u s e , this attachment facilitates the chasing of high precision external and internal, r ight- o r left -hand thread s of all forms . The ac curacy of the unit and its obvious advantages on work turned or bored in the same chucking, rend e r s it equally applicable to toolroom o r precis ion production work. Single-point tools o r cha s e r s can be us ed and taper threads can also be produced when r equired.
TAPE R T U RNING ATTACHMENT
This equipment (illustrated and de s cr ibed in the "Operation" s ection of this book) consists of an adjustable slide mounted on a robust bracket which bolts dir ectly on to the rear of the machine bed. The slide can be s et up to 2 00
included angle and the attachment has a length capacity of l O " .
AUT OMATIC LENGTH C ONT ROL ST OPS
3 1
Where extra a c curacy o f c ontrol is required, for instance in the threading of blind bor e s , a stop us ing micro -switche s c an be obtained as additional equipment.
This equipment (s e e page 64 )incorporate s plunger -operated (adjusta.ble ) micr o - s witches in conjunction with length rod and an adjustable device on the end bracket which allows the rod to c entralize when not in u s e .
32 HOLBROOK 'MINOR' PRECISION LA THE
T
Fig . 1 8 T he T ri-pan Toolhold e r
MULTI-T OOL HOLD E R
The "T r ipan" patented toolhold e r is an alte rnative t o the pillar type and is of advantage in general cent r e -lathe work. T he triangular clamping blo ck is ar ranged to accommodate a wide range of interchangeable toolhold e r s which allow r apid , po s itive re -lo cation of a number of pre -set tools . As the holde rs can be adjusted ve rtically, the need for c o r rect pa cking to obtain centre height is eliminated. T he des ign of the toolholde r affords maximum support to the tool and consequently can be used und e r heavy cutting conditions .
The des ign of the hold e r minimis es tool overhang and e liminates the n e ce s s ity of c ranked tools .
MULTI- INDEX PLATE
Allows dire ct, ac curate indexing for the cutting of multi - start threads and is normally a rranged with s ixty division s . The cam-lock s pindle no s e of the plate is identical with that of the lathe to allow the normal fitting of a chuck 0 r fixture .
STEADIE S
A bed mounting 3 -point steady (Fig. 1 3) o r a follow type , which bolts directly on to the machined face of the carr iage , can be supplied.
Fig . 1 9 Multi-index Plate
I r
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DESIGN AND CAPA CITY SECTION 33
Fig . 20 The Universal Cabinet
EQUIPMENT CABINET S
A wide range of equipment cabinets can be supplied. Of welded, heavygauge sheet metal construction, the s e cabinets will withstand .the abuse and strain of the normal workshop . They will provide a degree of fire prote ction and , by hous ing equipment in such a manne r that any item o c cupies the least space cons istent with e a s e of removal, will reduce time wastage due to mislaid items .
Use o f the s e cabinets permits tools for a particular machine to b e kept ready at hand so that, in many instance s , less time is abs orbed in s etting operations .
T he Universal Cabinet (Fig. 20) is designed principally for use with modern lathe s . C ompris ing s ix open compartments and four drawe r s , the largest o f which hous e s a baize lined instrument tray, this cabinet incorporates a dool'mounted spanner rack and a pocket for drawing s , etc . The handle of the cabinet is fitted with a barrel-type lo ck for which two keys are provided.
34 HOLBROOf( 'MINOR' PRECISION LA THE
OTHE R EQUIPME NT available for the 'MINOR' lathe includes : -
5" 3 -jaw s elf centring chuck with two sets of jaw s .
8 " 4 -jaw independent chuck with reversible jaws .
Plain toolholde r .
Plain toolhold e r (with vee)
Double toolholde r .
Cutting -off toolholder (with blade ) .
D rill holder .
Boring -bar hold e r .
D r aw-in collet equipment with set of collet s .
Additional collets .
Q uick- change toolbox including two inte rchangeable toolholders and one interchangeable boring bar hold e r .
T ranspos ing g e a r s for diametral, module and B. A. pitche s .
Inte rnal o r external step chuck with blank and clo s e r o r expander . 3 s izes range : i" - 2 " , 2" - 3 " , 3 " - 4 " .
Live centre (ball b earing ) for tailstock.
Spherical tu':"ning s lide for concave and convex turning .
Rear toolholder (with o r without bas e ) for surface s lide .
Square turret (detachable)
Topslide quick withdrawal unit.
Coolant pump and fitting s .
Electric lamp with Lo -vo -lite transforme r .
Threading Dial (for the machining of extra long thread s ) - s e e page 42 .
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OPERATION GENE RAL PRE CAUTIONS
Follow lub rication requirements clos ely and us e oil specified o r equivalent.
It is absolutely e s s ential that work whether in a chuck or on an arbo r b e held firmly.
3 5
In arbor work, the dr iving medium must b e slip-and -creep-proo£' If a carner is used , it must be lo cked to the driving pin by s et - s c rew o r s imilar mean s .
The starting clutch should neve r b e jerked into ope ration. The dr ive must be allowed to engage evenly.
When reversing from forward motion avoid pushing lever direct through stations i. e . brake into revers e . If this action is d elib e rate i. e. po s itive motion into brake po s ition pause and then into alte rnative r otation r equired, exce s s ive strain on switch gear and variable speed mechanism will be avoided.
Ensure that if supply is cut off at source or thermal overloads operate that clutch leve r is moved into braked po sition before opening switch gear cabinet ( Isolato r Inte rlocked) to release ove rload s . This will avoid any damage to work etc . , by s pindle rotating .
FEED D RIVE Switch off with sele ctor switch (Red Light) when not in u s e . Do not t urn variable feed control below ' l O O ' .
D o not use dead stops (When supplied) when threading, as s evere damage to gearbox will o ccur.
Disengage thread in g dr ive when us ing high speed range 5 0 0 - 3 000 or at any time when feed drive only is required.
Do not fo rce s election dial before disengaging lowe r LH leve r on thread cutting gearbox.
Damaged drill s ocket s , sleeves or other toolholders must not be used 111 the tailstock as thes e may rotate and s core the tapered bore .
When u s ing 4 -jaw chuck, spindle speed must not exceed 750 r . p . m.
3 6 HOUROOl '.'lIoR' PRECISIOII LA THE
ALIGNMENT CHE C K
After thorDugh initial lubrication o f the lathe , it is r ecommended that a turning test be made to confirm alignme nt of the bed . For thi s , a bar of mild s t eel approximately 2 " diameter x 6" long should be firmly gripped in the chuck and rough turned to the form shown in Fig . 21 . Using a ke en tool, a s e ries of light cuts (approx . 0 . 002 " depth ) .hould then be take n over the large diamete r s to allow che cking by micrometer for parallelism. Any e r r o r evident from this test will mo st probably be due to incorrect levelling or unstable foundations .
"'"
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: . .
Fig. 2 l Turning T e st of Alignment
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OPERA TION SECTION
FORWARD �-- - A
1-::"-- - -
Fig . 22 Movement of Joystick-type Switch
Control of Spindle Rotation
, FREE X ,
/
Fo rward and reve r s e rotation of the s pindle is synchronised with the feed drive and is controlled by the sho rt joystick-type switch On the extreme right
3 7
of the control panel. As a safety feature the collar of this switch must be lifted s lightly to allow movement. As shown by the symbolised instructions on the panel movement of the switch towards the head stock caus e s forward rotation of the spindle and movement in the oppo s it e dire ction eff"cts rever s e rotation. Movement of the s witch to the centre applies a brake and a ' spindle f r ee ' po s ition is lo cated at right o f cent r e .
T he operator will quickly appreciate the r e s ponse o f this control and will find that its convenient po sition and 'fee l ' allow its use instinctively. Howeve r th e unit is not d e s igned to withs tand c ontinual abus e by being fo rced e ithe r from a fast forward po s ition directly into reve r s e o r vice ve r sa . Exc e s s ive strain on the s witch gear and variable speed mechanism will be avoided if the ope rator cultivates the habit of moving the control po s itively into the b rake pos ition and paus ing before moving it carefully into the alte rnative po s ition .
3 8
F E E D
HOLBROOK ' MINOR' PRECISION LA THE
M A I N C O N T R O L PA N E L .
VAR I A B L E S P E E D C O N T R O L .
MAI N S WA R N I N G L I G H T. ( G R EE N )
F E E D S WAR N I N G L I G H T. ( RE D )
rB RA K E O N .
S P I N D L E FORWA R D.
BRA K E O F F.
R E V ER S E . C O O L A NT P U M P
C O N T R O L . S P I N D L E C O N T ROL . SPEED R A N G E C O N T RO L .
STEPL E S S REG U L AT I ON . F E E D D I R E C T I O N I N
FOR WARD M O T I O N .
Fig . 2 3 Layout of Control Panel
Cont rol of Spindle Spe ed
Infinitely-variable forward o r reverse spindle spe eds from 8 0 - 3 0 0 0 r . p . m. , a r e available in two ranges s ele cted b y ope ration of a thr e e -po s ition switch on the control panel. The centre position of the switch applie s a spindle brake and this can be used in preference to the brake in the s pindle fo rward / reve r s e switch previously d e s c r ibed.
Within e ach range , s pindle spe ed is variable by r otation of the large fluted knob above the speed ran g e s ele cto r . IT IS INiPORTANT THAT SPEED SHOULD B� VARIED ONLY WHILE SPIND LE IS RUNNING : damage may o c cur if this val'iato r knob is turned when brake is on .
. Spindle spe ed in e ithe r range and in fo rward o r reve r S e direction is indicated on the heads tock tachometer .
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OPERA TION SECTION 3 9
Control o f Feed
The inde pendently-variable fe ed me chanism is ene r gis ed by ope ration of the three -po s ition switch on the main control panel. Symbols on the panel denote the manner of s ele ction for either f e ed direction r elative to forward spindle rotation and engagement of the circuit is indicated by illumination o f the red warning light nearby.
Rate of feed is c ontrolled by rotation of the fluted knob on the extreme left of the control panel but can also be decreased in the ratio of 6 : 1 by use of the push-in knob on the face of the two -speed apron. T he combination of the s e features produce s an overall range of feed from -i- " to 1 2 " pe r minute .
Br ie fly, the method of ope ration is a s follows : -
(a) With spindle rotating in direction required and at pre -dete rmined speed, ene rgise feed circuit in dir ection of travel r equired.
(b) Select a suitable fe ed rat e .
( c ) Engage the r equired surfacing o r sliding feed b y ope rating the appropriate control on the apron.
When us ing the forward / reverse joystick s witch the direction of feed is synchronised with the spindle rotation . When using the high/low speed range s witch, the fe ed and s pe ed motions are not s ynchronis ed .
T HE VARIAB LE FEED C ONT ROL SHOULD N O T BE T URNED BE LOW ' 1 0 0 ' .
Fig. 24 The Control Panel
40 HOLBROOK 'MINOR' PRECISION LA THE
) _ .J r. "
• _ _ ..... ' d
- -._ -. r,_ • !_:. '.�
Fig . 2 5 Gearbox Controls
Feed motion can be stopped independently of spindle rotation, by use o f the apron control. Feed motion should be stopped befo re a change in dir ection is made and the feed se lector switch should be in the 'off ' ( central) po s ition when the feed drive is not required.
T HREAD C UT T ING
IMPORT ANT The lowe r range of speeds ( 80 - 5 0 0 r . p. m . ) only should be used for threading ope r ations .
The totally enclo s ed gearbox of this lathe is de s igned only fo r u se when threading and allows the machining of thirty pitches from 8 to 6 4 t . p. i.
T he d rive to the gearbox is engaged by a pus h-in knob (Fig. 2 5 ) at the left end of the headstock.
Refer ence to the threading plate on the upper s urface of the gearbox will allow the appropriate leve r and dial s etting s to be determined. It is mo s t
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OPERA TION SECTION 4 1
impo rtant that the interlock leve r i s pulled out and upwards to its full extent before the s election dial is turned ; rotation of the dial othe rwis e may caus e se rious damage .
The po s it ion of the lever o n the right of the thread s election unit dete rmin e s the fo rward or reve r s e dir e ction of the leade r and thus the direction of carriage t ravel. Any of the above selections can be made or changed while the lathe spindle is running at a speed within the lower range ( 8 0 - 5 0 0 r. p . m. ) if the g e arbox is disengaged by pulling out the knob on the left of the headstock (Fig . 2 5
For ext r a pre cision during thr ead cutting ope rations the dis engagement of the rack pinion is recommended. This is achieved by pulling out the knob in the centre of the apron handwh e el .
MET HOD
The spindle spe ed and dire ction should be se t and the ge arbox controls adjusted to suit the characte ristics of the thread to be cut . Then the tool should be se t to the r equired depth fo r the initial cut and the leade r nut engaged by moving the apron lever firmly down.
Ope ration of the joystick control lever on the main control panel (Fig . 2 2 ) will cause spindle rotation and s imultaneous traverse o f the carriag e . When the tool has travelled the required d istance , the joystick leve r should be us ed to stop s pindle rotation and carria ge movement . The tool should then b e withdrawn clear of the work before the joystick lever is us ed to reve rse the car riage to it s or iginal po s ition to allow r epetition of the cycle with an increased depth of cut .
ME T RIC OR SPE CIA L PIT C HE S
The quadrant ins ide the gearbox is a rranged t o accommodate a 1 2 7 -tooth g ear fo r the produ ction o f a small range of metric threads from 0 , 3 7 5mm to 3mm. If other pit che s are r equired se ts o f change gears fo r module , metric and diametral pitch e s , o r a complete metric g earbox can be supplied .
When fitting, all inne r change gears must be mounted with the longer bo s s on the inside and all out e r change gears mounted with this bo s s on the outs ide .
42 HOL8ROOl 'MINOR' PRECISIOII LA THE
F ORMU LA F OR SPE CIAL PIT C HE S
N Form ula = =--..,---.,----,----:----,
T hread per inch required
A 60 Where : -
B : 1 2 0 = Constant
= A x C B x D
and whe re N = number of thread s to which gearbox must be s e t (given on threads per inch s e ction of the thread plate ) . F ORMU LA FOR ME T RIC PIT C HE S
Pitch required to mm. N
A x C whe re A = B x D D
= 6 0 = Constant 1 2 7 N . is given on threads pe r inch s e ction of the thread plate .
T HREADING DIAL
For the ma chining of extra long threads a threading dial can be supplied. One complete revolution of the dial, which has two main divisions and two sub -divis ion s , represents 2 " travel of the leads crew.
To cut E VE N numbers of threads , e . g . 1 6 threads per inch, the lead s crew nut may be engaged by any divis ion on the dial.
To cut ODD numbers of threads , e . g. 1 5 threads per inch, the leads c rew nut must be engaged only at the main divisions on the dial.
To cut F RACT IONA L thread s , e . g . 1 6i threads per inch, the leads crew must be engaged only at the main division 1 .
D. P. A
1 6 60 1 8 6 0 1 9 60 2 0 60 2 2 60 2 3 60 24 60 2 6 6 0 2 8 60 3 2 6 0 3 6 6 0
OPERA TION SEC TION
S TA N DA R D D I A M E T R A L P I T C H E S
A
) ./
G E A R ' A I S 60.T. T H I S IS CON -
S TA N T .
/' � ! \ . � C
) ) //- ---Z , ""' . /1/ �
� , �. If 100 .T. /' �--+--¥�'=P===W;iI-I \ --t---t---�\ ) "
/
S TA N DA R D C H A NG E
2-90, 1 2 0 & 1 2 7. T.
\
N - G E A R B O X S E TT I N G
B C D N D.P. A B C D N
1 2 0 1 1 0 70 8 3 8 6 0 1 20 1 1 0 70 1 9 1 20 1 1 0 70 9 40 60 1 2 0 1 1 0 70 2 0 1 2 0 1 1 0 70 9 - 5 4 4 6 0 1 20 1 1 0 70 2 2 1 2 0 1 1 0 70 1 0 4 6 60 1 20 1 1 0 70 2 3 1 2 0 1 1 0 70 I I 4 8 6 0 1 20 1 1 0 70 24 1 20 1 1 0 70 1 1 - 5 5 2 60 1 20 1 1 0 70 2 6 1 2 0 1 1 0 70 1 2 6 4 60 1 20 1 10 7 0 3 2 1 20 1 1 0 70 1 3 7 2 60 1 20 1 10 70 3 6 1 20 1 1 0 70 1 4 60 60 1 2 0 1 1 0 7 0 40 1 2 0 1 1 0 70 1 6 8 8 60 120 1 1 0 70 44 1 2 0 1 1 0 70 I S
G EA R S R E QU I RED FOR A L L PI TC H E S : -
55, 60, 63,65, 66, 70, 75, BO, B4, B8 , 96, 98, 99, 100, 1 04, 105 & 1 1 O.T .
F ig . 2 6
43
/' --- /
44
�T�H A B 0· 3 5 6 0 1 2 7
·375 60 1 2 7 0·4 6 0 1 2 7
0· 45 60 1 2 7 0· 5 60 1 2 7 0 · 6 60 1 2 7 0 · 7 6 0 1 2 7 p·75 60 1 2 7
PI�CH M M A B
0·5 60 1 2 7 0·7 5 60 1 2 7 1 · 0 60 1 2 7
1 ·2 5 6 0 1 2 7
1 ·5 60 1 2 7 1 · 75 6 0 1 2 7 2· 0 6 0 1 2 7
2· 2 5 6 0 1 2 7 2· 5 6 0 1 2 7
HOLBROOK 'MINOR' PRECISION LA THE
S TA NDAR D M E T R I C P I T C H E S
N - G E A R B O X S E T T I N G
C D N ITSH M M A B C 0 N
8 4 9 0 6 4 0 · 8 60 1 2 7 1 0 4 6 5 4 8 9 0 9 0 6 4 1 · 0 6 0 1 2 7 9 0 9 0 2 4 8 4 9 0 5 6 1 ·2 6 0 1 2 7 9 0 9 0 2 0
9 6 80 6 4 1 · 5 6 0 1 2 7 9 0 9 0 1 6
9 0 9 0 4 8 2 '() 6 0 1 2 7 9 0 9 0 1 2
9 0 9 0 4 0 2 · 4 6 0 1 2 7 90 90 1 0
1 0S 7 5 4 8 2 · 5 6 0 1 2 7 1 0 5 6 3 1 6 9 0 9 0 3 2 3 ·0 6 0 1 2 7 9 0 9 0 8
STA N DA R D M O D U L E P I TC H E S
N .. G E A R B O X S E T T I N G C D N 't'�WH A B C D N
9 0 9 0 4 8 2 ·7 5 6 0 1 2 7 1 1 0 60 1 6 1 1 0 5 5 6 4 3 ·0 6 0 1 27 9 0 9 0 8
9 0 9 0 2 4 3 · 5 6 0 1 2 7 9 8 8 4 8
1 00 80 2 4 4· 0 6 0 1 2 7 1 0 0 75 8
9 9 6 6 2 4 4 · 5 6 0 1 2 7 9 9 6 6 8 9 8 8 4 1 6 5 · 0 6 0 1 2 7 1 0 5 6 3 8 9 0 9 0 8 5 · 5 6 0 1 2 7 1 1 0 6 0 8
9 9 8 8 8 6 · 0 6 0 1 2 7 1 1 0 5 5 8 7 5 9 0 8
Fig . 2 7
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OPERA TION SEC TION
'[ RIGG E R :"' ! E C H ANISM ( F ) F O R D iSE NGAGiNG T O O L F R O i\'! W U R K
A D J U ST A B LE LENGT H STOP ( G )
S P R i N G PRESSURE ADJUSTM£�T (H)
D E P T H S T O P (L)
F E E D LL'J DIAL ( /vr)
LOCKNUT (K) I � , �
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Fig. 2 8 T he T hread Chas ing Attachment
USE OF T HREAD CHASING ATTACHMENT
45
This attachment (Fig s . 2 8 & 2 9 ) allows the production of various external o r internal thr eads without engagement of the machine leadoT or feedshaft . Appropriate master thre ad forms are arranged on the end o f the m'lcr,,; ne spindle and on the thread chasing arm of the attachment to act as lead e r and followe r ( ' D ' and ' E ' ) r e spe ctively.
It is of the utmo st importance that the roller blo ck (A) is pe rfe ctly level b efo re commencing any thread. The rolle r block adjustm ent s c-,' ew (B ) is e c centric fo r the purpo s e and should b e adjusted accordingly and s ecurely lo cked afte r a djustment.
The attachment lever (C ) is held down so that leader (D) and followe r (E ) a re in contact and, with the dr ive to the apron disengaged, s low spindle r otation commenced. The predetermined length of thread is then cut complete , the
46 HOL8ROOI 'MINOR' PRECISION L A THE I
r (
F ig . 29 Rear View of Thread Cha sing Attachment (rais ed) I , tool b eing lifted clear of work automatically by the trigger mechanism (F ) . Thr ead l ength is adjus table by s etting of a stop (G) . l :
The trigger a ction may be prevented if required , by fully lo cking down s c rew (L ) .
Further adjustments are po s s ible t o suit coars e and fine thread s : s c r ew (H) may be us ed to increase o r d e c rease tension on spring ( J ) ; lock when adjusted by nut (K) .
The toolbox slide has fine adjustment (M) to . 0 01 " divisions to feed on the cut.
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OPERA TION SECTION
USE OF HYDRAU LIC PROFILING EQ UIPMENT
Hepwo rth type 1 5 0 copying equipment consis ts of the following five a s s emblies : -
pondence .
1 . Profile slide 2 . Swivel - mounted toolbox 3 . Rear beam and tailstock 4 . Pump s et and flexible pipe s 5 . Facing beam (optional extra ) The s e rial number of the equipment should be quoted m any corr e s -
PROFILE S LIDE ASSEMBLY
47
This a s s embly s lid es on a base which can be attached to the lathe in one of five alternative po sitions viz . , parallel to , or at an angle of 3 0 , 4 5 , 60 or 90 degrees to the lathe centre line .
The profile s lide inco rporates a hydraulic actuating cylinder , with a fixed ramshaft attached to the bas e slide , and a hydraulic control valve cartridge with all neces sary internal po rting . It als o carries the s tylus lever bearing a s s embly and the retraction as s embly.
Precision ground V- slides are u s ed and rigid strips are fitted for wear adjustment. An adjus table retraction stop is provided .
The upper surfac e of the profile slide carries entry connections to the hydraulic system. For installation purpo s e s , Fig. 30 identifies the three hydraulic s upply lines at 'the profile s lide and pump s et .
C ON T ROL VALVE
Car ried in a flanged hous ing and s e cured in the profile slide , with suitable s eals , the control valve is a s elf- contained a s s embly. Every valve is calibrated at the wo rks and pe rformance details are individually recorded. A complete r eplacement can be obtained but component s pa r e s are not supplied .
ST Y LUS LEVER
The s tylus lever is rigidly attached to a vertical po int shaft mounted on pre - s et angular contact bearings within the profile s lide casting . The outer end of the s tylus lever embodie s a mounting hole fo r the 'vertical stylus rod , which is adjustable in height. The rod in turn carries the s tylus it s elf. An ope rating tappet for the control valve is carried on the pivot shaft.
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POWER
UNIT 8
�--
A
PROFILE
UNIT
A
�. A 10 A 1 6 SORE PRESSURE
8 10 8 If SORE RETURN �.
C 10 C I . BORE LEAK
Fig. 3 0 Pipe Connections on Hydraulic
P rofiling Unit.
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OPERATION SECTION 49
RET RACTION HAND LE
This a s s embly consists of a manually ope rated e c c entric acting on the valve leve r . Control is through a hand lever conveniently s ituated at the s ide of the unit. The retraction handle is provid ed with dead stops at the ON and OFF po sitions .
T OOLBOX
The equipment is supplied with a Dickson -type int e r changeable toolholder blo ck mounted in a V-s lide to an"indexing bas e . Lead s c r ew and dial system provid e s adjustment in one plane .
The ba s e slide is s wivel mounted to the unit, and has pre - s et swivel adjus tments to co rre spond with tho s e provided on the profile ba s e . The unit is supplied with one No. 1 s iz e toolholder and all standard Dickson toolhold e r s can b e filted as neces sary .
A tool up to 5 / 8 in . x 1 / 2 in . s e ction can be r e commended .
RE AR BEAM
T he r'ear beam is carried on two brackets which are pe rmanently affixed to the lathe bed. Adjustments can be made, r elative to t" ,e lathe cent re line to provide compensation fo r change in stylus pos ition due to s wivelling through the range of angular s ettings of the profile s lide a s s embly.
The beam can also be manually adjusted to this relative pos ition, whils t an e c c entric stud at the tailstock end allows fine adjustment fo r parallelism,
T ailsto ck type model and template carriers can be fixed at any po s ition throughout the beam length, thus making provis ion fo r models of length up to the full capacity of the lathe . T he model carrier at the heads tock end of the lathe incorporates a spring -loaded c ent r e , while the oppo s ite carrier is provided with s c rew adjustment to centre to give final longitudinal s etting of model r elative to workpiece .
Each tailstock hous ing carr i e s a flat machined platfo rm to accommodate t emplat e s , which are also longitudinally adjusted through the s c r ewed tailsto ck c entr e .
PUMP SET
The s elf- contained tank a s s embly inco rpo rat e s a motoris ed rotary pump of 0 . 3 g . p. m. capacity, with an in-built relief valve s et at the facto ry to 3 0 0 p. s . i . A mic ronic filter is inco rpo rated in the pres sure line of the piping , which is grouped within a cir cular bo s s on the upper s urface of the lid .
5 0 HOLBROOK 'MINOR' PRECISION LATHE
G
PIVOT
STYLUS
PUMP
REL!EF VALVE
Fig. 3 1 Hydraulic Circuit for Profiling Equipment
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OPERA TION SEGTION 5 1
Mounted on the top of the motor is a dire ct-on-line push-button start er . As with the motor its elf, alte rnative type s a r e available t o suit the spe cified ele ctrical supply. All motors and s tarters comply with C . S . A. requirements if specified .
HYDRAULIC CIRCUIT
As illustrated in Fig . 3 1 pres sure oil from the pump pas s e s through the relief valve , ent e r s the control valve at annulus A, and flows dir ectly to the ramshaft end of the cylinde r F. In addition, pressure oil from annulus A pas s e s through two drilled ports (B ) to the valve spool chamber C and thence into annulus D through the firs t r e striction, which is formed by the valve spool and the line r end . A s e cond r e striction is interpo s ed befo re the pre s sure oil r eaches the v"lve spool chamber E, which is c onnected to tank. Annulus D is connected to the cylinde r at G.
The supply pres sure thus pas s e s to sump through two variable o r ifi c e s . Longitudinal defle ction o f the valve spool in the direction of the spring inc reases the pr e s sure drop from chamber C to annulus D . Conver s ely, defle ction against the spring decreases the pres sure drop. Since the supply pres sure is ultimately d ropped to sump, a longitudinal po s ition of the valve spool can be achieved at which the pres sure drop is equal across each or ifice : in this po s ition, pres sure in annulus D is half the supply pres sure .
The cylinde r is so arranged that the area of the end of the ramshaft F is half the area of the end of the piston G. Since supply pres sure ope rates on half the area of F while only half supply pressure ope rates on the full area of G, the for c e s on the piston are equal and oppo site : cons equently, the cylinde r is at r e s t in a pres sur e -balanced condition.
The contact of the leve r -mounted s tylus on the model maintains the unit in this balanced condition until a d efle ction of the valve re sults from an increase o r decrease in model diamete r being encountered during a longitudinal feed . D efle ction caus ed by an increase in model diamete r will produce a cylinder movement t o the r ight, taking with it the pivot of the stylus lever and thus enabling the valve spring to r e store the balanced c ondition at a new diameter . In a s imilar mann e r , a de crease of model diameter will result in defle ction of the valve away from the spring and the movement produced will r e store balance at the reduced d iamet e r .
External ove r-r iding defle ction of the valve spool produced b y the me chanical r etraction system against the spring move s the cylinder away from the model to the limit of cylind e r stroke.
52 HOLBROOK 'MINOR' PRECISION LA THE
FACING BEAM
Available as optional extra equipment is a facing beam of simple design, compnslllg a flat template carrying bar attached to the saddle of the lathe at right angles to the lathe axi s . No s etting adjustment is provided on this facing beam; depth of form is set by moving the complete a s s embly of saddle , copying unit and template towards the fa ce plate of the ma chine .
FIT T ING T O LATHE
REAR BEAM
The two beam b ra ckets provided are permanently bolted to the rear of the lathe bed so that the machined top facings are square and level with the lathe centre line . The brackets are fixed at c entres to suit the clamping po sitions of the beam. As fixing d.etails vary cons ide rably from lathe to lathe, the company undertake s to provide detail drawings o f the ne ces sary fitting arrangements relative to any model .
Slots in the beam brackets allow for po sitioning in ac cordance with model diameter , sele ction of the beam po sition also depending on the angle at which the profile unit is to be operated .
When setting the beam fo r aprallelism it is recommended that a dial indicator be travelled along the outer datum edge of the beam from a fixed pos ition on the lathe sadele . The eccentric stud previously referred to gives the nec e s sary fine adjustment for final parallel s etting s .
PROFILE UNIT
This unit lS provided with a mounting flange at the front end and is s e cured to the extended cross slide of the lathe by two 5 / 1 6" UNC bolt s . Alternative tappings in the c ros s slide enable the unit to be mounted in the other ope rating po s itions .
PUMP SET
The tank of the power unit (capacity approximately 2 Impe rial gallons ) s hould be filled to dipstick indicator level with Shell T ellus 33 hydraulic fluid or eq ui valent .
Commiss ioning the Unit
On starting the unit, the following simple check should be mad e : -
( 1 ) That the unit reacts a ccordingly when the retraction level is moved away from the operator , L e . towards the lathe headsto ck, and advances when the lever is moved in the oppo s ite direction. The s e functions a r e r elated to the po s ition of the valve s pool and are s et at the factory.
I
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OPERA TION SEC TION
STYLUS
TOOL
�::�� UT
UT
UT G3rd C FINISH C UT WITH
OllOWING STYLUS F
COpy
Fig . 32 Shaft T urning
I I +--t----1f--- --- -- -- -- -- ---t--+-+ L I WORKP1ECE
'A'
--- ---MODEL
TRUE LENGTH TRUE LENGTH + r TRUE LENGTH
Fig . 3 3 Blending Machining
5 3
54 HOLBROOK • MINOR' PRECISION LA THE
It is advisable to start up with the unit in the r etracted po sition.
(2) That there is no air in the system. Air is bled from the s ystem by eas ing the bleed plug at the rear of the unit. This ope ration should take place with the unit fully advanced. B e tween each bleeding the unit should be moved ba ckwards and fo rwa rds . This sequenc e of operations should be r epeated until all air has be en expelled and the unit moves smoothly. The ble ed plug should be firmly tightened befo r e the unit is run.
( 3 ) That the wo rkpiece and model are mounted and that the tool is se t to c entre he ight. The longitudinal po s ition of the model should be s et with the stylus in contac t with the end of the model and the tool contacting the component at the co r r esponding point.
OPERAT ING T HE UNIT
The method of turning the component down to s iz e can be varied but it l S sugge sted that the c ros s slide be taken towards the rear of the lathe with the unit fully advanced : this leaves the full stroke available fo r profiling . Us ing the no rmal c r o s s slide handwheel, the tool can then be brought to the workpie ce and turning commenced with the tool s lide on the unit se t back to the full extent of its adjus tment.
At this point the stylus may not be in contact with the model. In this ca se , success ive cuts should be taken in the manner d e s cribed (Fig. 3 2 ) until the s tylus picks up the model along all it s diameters . When this has b e en achieved, final s etting of one diameter is obtained by means of the depth-of- cut slide provided on the toolbox . Longitudinal s etting of shoulders to the model is effected by turning the handwheel on the adjustable model tailsto ck.
T he tool should always be retracted from the wo rkpie ce before the s addle is returned.
B LENDIN G PROCED URE
As mo st shafts involve diameter steps at each end and have a parallel po rtion at the maximum diameter , it is usu,,-lly neces sary at some stage of the machining operation to turn the wo rkpie ce end-fo r - end in the lathe .
As it is not des irable to blend the machining along the central diameter , it is suggested that this po rtion b e turned to a point beyond its firs t r ever s e shoulder . In o rder that this can be a chieved without the tool plunging (as it would on a s iz e fo r - size model) , the length o f the model is inc reased , as shown in Fig . 3 3 by approximately 3 / 8 " , in o rder to enable the operato r to retract the tool aft e r it ha s turned beyond the t rue component length. When the workpie ce and model have been revers ed , the shoulde r is s et to give the correct length and the tool is r etracted b efo re it travels along the top dialneter - which has previously been machined.
[ , . I I
[ :
OPERATION SECTION 5 5
SCREW C UT T ING
Use of the copying equipment enables imp roved s c r ew threads to be cut by a s ingle -point tool mounted in the toolbox of the profile unit.
With the unit in the fully advanced position, a 90 degrees run-out face is arranged on a model , the longitudinal setting being arranged to coincide with the s crew cutting withdrawal point. T his arrangement, re lieves the operator of the need to withdraw the tool manually from c ritical und e r cuts , e tc . , at the end of the cut . Not only doe s this ena1:le fast speeds to be us ed, but it also re sult s in a corresponding improvement in finish.
GENE RA L PERF ORMANCE
The quality of reproduction is determined by the ac curacy of re sponse from the copying unit and the accuracy of alignment of the axis of the workpie ce to that 01 tlle model . Should the quality of work be unsatisfactory , the following notes g ive guidance as to pos sible s ources o f trouble and the corrective measur e s which should be applied .
( 1 ) RESPONSE ACCURACY
In principle , the c opying mechanism is so des igned that the hydraulic cylind e r moves as nearly a s po s s ible in the exact path followed by the stylu s . Valve movement required t o produce change in the po s ition o f the cylinder must the refore be made as small as po s s ible . (It is of inte r e s t to note that, in common with all s e rvo-mechanisms , the system is "error-ope rated " in that it depends on a difference o c curring between the actual cylinde r po s ition and the pos ition demanded by the model to produce valve defle ction and consequent correcting movement of the c ylinde r ) .
Should the unit be found to be faulty, a che ck should be made with the unit in a free state ( i. e . tool not cutting ) by means of a micrometer spindle which is rigidly clamped to the base slid" . The end of this s pindle contacts the s tylus at an intermediate point in the stroke . At this po int of contact a dial indicator from a fixed datum is s e t to the front of the tool slide .
The micrometer spindle enable s small defle ctions to be applied to the valve and the r e sponse measured on the dial indicato r . The unit must produce a definite r espon s e within a deflection of O . O D D S " , so that two distinct and s eparate movements can be obse rved within 0 . 0 0 1 " deflection taken in backward and forward steps .
This check c ove r s the overall assembly s ince it takes into acc ount the inte rnal alignment of the unit a s sembly and the tightne s s of the slide as well as the actual re sponse character istics of the hydraulic valve and cylinde r , and also a s c e rtains that the valve is not sticking .
TURNING
�" >S"
I � . � I� 11 i\
20" DIRECTION Of fEED
Fig " 34
fACING
£l
1 1 "
Fig " 3 6
10"
DIRECTION OF FEED
Turning-Unit respectively at 60 degrees and at right angles [0 lathe axis. Fig. 3 5
i l � "
Facing-Unit respectively at 30 degrees to and parallel with lathe axis. F i g " 3 7
1.11 '"
.-. ��
OPERA TION SECTION 57
( 2 ) ME CHANICAL ACCURl', C Y
Hilving e s tablished that the unit is ope rating corre ctly, a che ck o f model pa rallelism should be made in relation to a te st bar be tween centre s . Other gene ral po ints to check are (a) that the tool radius is equal to the stylus radius , (b) that the s tylus edge is vertical, and (c ) that the s tylus leve r move s freely in it s bearings without end play.
( 3 ) MEASURING SLIDE FRICT ION
In orde r to be able to check that the friction of the controlled slid e is within pe rmis s ible limit s , a pres sure gauge can be mounted in the rearmo st of the two vents provided in the hydraulic cylinde r .
U s ing a reliable 0-400 p . s . i . gaug e , the copying system should b e actuated b y pulling back the s tylus with gentle finge r pre s sure until the s lide move s through the full stroke of the cylinde r . Reduction of finge r pre s sure at the extent of the cylinder st roke will cau s e the s lide to move s lowly in the r eturn dire ction.
At no time during the cylinde r travel through its forward and r eturn stroke should the variation in maximum and minimum gauge r eadings exceed 3 0 p. s . i .
F ORM T URNING LIMITATIONS
Figure s 34 to 3 7 show diagrammatically the limits on fo rms which can be turned in relation t" the direction of feed indicated at the unit angle s spe c ified. The rate of longitudinal feed s hould be r educed s lightly when turning r ever s e taper s o r curve s up t o maximum angle , s ince the forward travel of the unit due to hydraulic s troke is in the s am e direction a s the longitudinal feed .
MAINTENANCE
A simple maintenance routine should be obse rved daily. The only requirements are that the slid e s should each be given a shot of o il through the nipple s provided and that the hydraulic oil should b e kept t o dipstick level. Shell T ellus 33 o il should be used for topping-up purpo s e s and the level s hould not be allowed to fall more than 1 /4" .
At approximately s ix -monthly inte rvals the pump unit should be r emoved from the oil tank. A r eplac ement element should be fitted in the line filte r and the o il renewed if it is noticeably dirty. Air must be bled from the system aft e r thi s ope ration.
5 8 HOLBROOK 'MINOR' PRECISION L A THE
ABRIDGED· SPE CIFICAT ION
Cylinder bore
C ylind e r stroke
System pres sure at balanc e
Theore tical maximum stalled effo rt . . .
Maximum diamet e r of model
Maximum approach and retraction speed
PUMP SET
·Pump
Motor
Starter
Pre s sure filt e r
Oil capacity
Relief valve s etting
1 . 3 / 8 "
3 0 0 p . s . i. (approximately) 2 00 1bs .
3 "
1 1 0 in/min.
Barne s GC - 1 5 0 7 /A /40/EA 1 / 3 g . p . m.
1 / 3 h. p . , 1 44 0 r. p . m. flange mounted
Crabt r e e D . 6 D . O. L. pushbutton type , fitted with the rmal ove rload relea s e .
Purolator M. F . 3 9 1 5
2 impe rial gallons
3 0 0 p. s . i.
r
I L
I l .
INACCURATE RE PROD U CT ION
(a) Unit fails to turn pcrallel.
(b) Unit fails to climb shoulders .
( c ) Unit "floats : ' away from model .
E RRATIC PERF ORMANCE
(d) Slow or sluggish unit.
( e ) Unit o s c illates .
OPERA TION SECTION 59
FAULTS - CAUSE S AND REMEDIE S
CAUSE
Malalignment of model or workpiece with axis o f lath e .
1 . O're rload due t o depth of cut and / o r tool rake (with po s itive rake ) . 2 . Exce s s ive length o f stylus or loo s e stylus . 3 . Longitudinal feed too fast .
Sticking valve o r stylus leve r .
CAUSE
1 . Cold oil.
2 . T ight s lid e .
1 . Slide too free .
2 . Stylus or s tylus leve r loo s e .
3 . Air in hydraulic circuit.
REME D Y
Check by means o f tes t bar and correct .
R educe cut or adjust tool rake .
B r ing to 5 / 8 " length and/ o r tighten. Reduce feed rate .
Remove valve spool, clean and replace , with car e .
REMED Y
Run pump s et until working temperature of 1 00-1 2 0
0F . (3 8-49
0C . ) is
obtained.
Adjust .
Adjust slide strip.
T ighten.
Bleed s ystem.
60 r "0 2 a
g i �. � i � � •
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� � ,
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8
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.9 " cif . ; �
.: � ",, ' �
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9 g�� " , .
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'OJJ 'M r". [
-,
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\
AOJU5TA8lE CENTRE
A 205904
AD.JUSTlNG SCREW
.4. 20593
/ ADJUSTABLE TAllSTOCK
C 25686
OPERA TION SECTION
"I._----"OJUSTA8LE TAllSTOCK
C 25686
SEAM
'J,.lfJ"'� _________ SETT I NG DEVICE
BEAM BRAClI:ET
C 25685
SPRING CENTRE
A 20596
C 25685
Fig . 39 Tailstocks
ANOERlON CIRCLIP
CLI P N' 62 TAILSTOCK S�ING
S l8Sn
END PLATE
.4. 20571
SEAM
SPRING TAILSTOCK
C 25687
6 1
62
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TOOLHOLDER
B . 2 5 7 1 0/ �. B . 2 5 7 0 9/ 1 11 No 10 UNe. SKT. CAP5CREW X l2 LG.
3{/ DIA. DOWEL X �" LG.
A . I B 9 7 5 .
A. 2 2 1 49.
A.2 2 0 8 S .
"
'I � 'I 3 11
f � �6 DIA. STEEL BALL
I �iTt A. 2 2 0 B7.
No 10 UNCX \I;{' LG. SOCKET GRUBSCREW
5 . 2 5 7 1 3 . N o 10 UNC SOe. CAPSCREW X 12" LG.
C. 2 2 0 B 4.
A. 2 1 8 1 2
L-. --.J
No 6 UNe. RD. HD. SCREW X %" LG.
mE £':_ . S . I B 470.
. .J � ¥ 11 'u, 32 SPRING PIN X 01 LG.
L II 1 11 SPRING PIN YB DIA. X � LG.
A. 1 7 7 6 S .
F ig . 4 1 T h e P r ofiling T oo1ho1d e r
I I1 I 11 SPRING PINYS DIA.X IYS LG.
�" DIA. SPRINGWELL OILt':R
I 11 3 1I \:i UNe. GRUBSCREW X YS LG.
A . 2 5 9 3 3.
0"V>
64 HOLBROOK 'MINOR' PRECISION LA THE
K N U R L ED S E L EC TI O N
K N O B FOR
TRAVEL D I R E C TI O N .
· � · i + +
L E N G T H C O N T R O L S TO P
1 · -- - - ·
I I
ADJ U S TA B L E S TO P S .
F ig . 42
AUT OMATIC LENGTH C ONTROL ST OPS
This equipment (Fig. 42 ) incorpo rates plunge r-ope rated (adjustable) micro-switches in conjunction with length rod and an adjus table device on the end bracket which allows the rod to c entralize when not in us e .
A
+ A + v
F ig . 43
the work and , cycle with the
T urn knurled knob to desired s equence for example 'A ' (Fig . 43 ) i . e . R . H. thread travelling from r ight to left with spindle running in forward dire ction. Turn unde rcutting r e c e s s a t length r equired for thread, making dummy run with tool away from work. Set L. H. stop to a ctuate when tool runs into unde r cut and s e t R. H . stop at othe r end of t ravel. T o turn thread set tool to r equired depth of cut, engage leader nut and ope rate forward lever to run onto L. H . stop which will stop the s pindle . Leaving leads crew nut engaged withdraw the tool from
us ing reve , s c , re turn carriage to R. H. stop befo r e repeatine the tool s et to the appropriate depth.
When commencing threading ope rations us ing above s tops , tighten c entralising leve r adjusting s crew against stop, the reby giving the ne c e s s ary friction if it is ne ce s sary to disengage the leadscrew nut and r eturn by handwheel . T his mus t be corre ctly adjusted so that when apron is moved away from s top, no lateral movement occur s in shaft. If incorre ctly adjusted s pindle will commence turning in dire ction previously s topped. It is impo rtant that exces sive speeds are not used when us ing the s e stops . V.fhen not us ing stops , loo s en adjusting s crew 2.llowing s top s h2.ft to centralize .
( l . r I .
r I , r .
OPERA TION SECTION 6 5
When using alte rnative s equenc e , i . e . L. H . thread turning from r ight to left with spindle turning in forward direction,
o turn indexing knurled knob through 1 80 to r B r (Fig . 44) and repeat above s equence of ope rations . + +
B
Fig. 44
TAPER T URNING
T his equipment is bolted to the rear of the lathe bed and is eas ily fitted or removed.
To engage the equipment the procedure is as follows : -
T he r etaining s crew in the surface slide nut s hould be removed and pla ced in the slot at the end of the surfacing slide . In conjunction with the top slide movement , the best po sition for the required wo rk should be dete rmined and the retaining s c rew fitted into the sliding blo ck. By rele a s ing the clamping .olts at each end of the taper turning s lide , this should be se t to the required angle and the bolts r etightened.
S U R FA C E S L I D E N U T
RETA I N I N G S C R EW S L I D I N G B LO C K .
. "'" �. , -l&- '
C LA M P I N
/ B O LT S .
/ � t--
\ ' ' / 1 � \ I , f / . � /
n r.;/;" f---\ H-I It: 'h ij �� I \. J I I"! P
� Fig. 45 Taper Turning Attachment
G
66 HOLBROOK 'MINOR' PRECISION L A THE
CUTTING F LUIDS
Cutting fluids for machining ope rations should be carefully cho s en. Tho s e of infe rio r quality or tho s e which are not used in the recommended manne r may cause corro s ion of the work and machine tool.
Cutting fluids for g ene ral machining purpo s e s a r e usually of the iollowing type s : -
1 . Straight Oils . These are bas ed on mine ral o ils re info rced with various additives cho s en to suit the operation for which they are des igned . Stra ight cutting o ils are unlikely to caus e corros ion if the o il companies ' r e commendations are followed.
2 . Wate r -based Cutting Fluids These are usually soluble oils which, when added to wate r , form emulsions with the cooling prope rtie s of water and the ability to s uppre s s corro s ion. Also used to a limited extent are fluids which dis solve in water , forming s olutions of corrosion inhibitors and other additive s . The pro po rtions of water to neat fluid vary between 2 0 : 1 and 40 : 1 fo r general machining purpo s e s but emuls ions as strong as 1 0 : 1 are used in spe cial cas e s .
r
C o r r o s ion of the machine and wo rk may be caused by water -based fluids and if this is to be avoided it is important that they are carefully chosen and prope rly used . T he choice of a suitable g rade and dilution will be dictated by the apPlication
dand to s ome extent by the lo cal water conditio
fn s . The manufacture r
fs '
ll l , re commen atlOn as to strength and the correct mann e r 0 mixing must be care u y obs erved. Unle s s the manufacturer specifically state s otherwi s e , the oil should be added carefully to the water when making an emuls ion ; if the water is added to the I . o il an unstable emulsion, which may be corros ive, will result .
During u s e the inhibitor and emulsifier content of the fluid will be depleted and topping up of the machine sumps should follow the manufacturer s ' in structions in order that the s e deficiencie s are corrected.
Ac cummulation of dirt and fine metal particle s in the sump and pipe s of the machine will contaminate the fluid and may make it unstable . Cleaning of the I coolant system at inte rvals is des irable , particularly when a change is made from l , one grade of fluid to another .
If the s e precautions a r e observed, satisfactory r e sults will be obtained with wate r -based cutting fluids .
WATER- BASED CUTTING F LUID S FOR GENERAL MACHINE SHOP USE
The products s hown in the following list have been te sted and found
OPE-RA TION SECTION 67
durins extended practical tests to be satisfacto ry and free from c o r r o s ive tendencie s at the dilutions listed . In s eve ral instances an addition of common washins soda in the propo rtions stated befo r e mixing the emuls ion was found bene ficial. The need for such water treatment and the amount of soda required depend s on local water conditions . The advice of the cutting fluid supplier should always be obtained before making the addition.
The He rbert corrosion test enable s the corrosive behaviour of emuls ions to be evaluated. It can e a s ily be carried out in a wo rk- sho p and details will be s ent to intere sted firms on application . Copies of the He rbert publication, " C o r r o s ion Control and Lubrication of Machine Tools " which deals mo r e fully with cutting fluids , may also be obtained on application.
T he products marked ' C ' in the following list are clear type cutting fluids , tho s e marked ' M ' are milky g rade and tho s e marked ' I ' are inte rmediate type .
LIST OF APPROVED CUTTI NG EMULSIONS
Soluble Oils s uitable for General Machine Shop U s e .
Conditions o f T e st T r ade Name T ype D ilu- Soda %
"Kalsol" Clear "Kalsol" AR. (New)
Ac cool 2 .
Hexol S 3 7 8 Hexol ST R
C M
M
M I
Batoyle S . 1 2 T r anslucent I Batoyle S. 7 M
Chevron Soluble C Chevron Soluble M
Kutmo 1 4 6
C M
C
tions (Weight)
4 0 - 1 2 0- 1
2 5 - 1
2 0 - 1 4 0 - 1
4 0 - 1 2 0- 1
4 0 - 1 2 0 - 1
40-1
Nil Nil
1 %
1 % Nil
Nil Nil
1 % 1%
1 %
Supplied by
K. AlIen & Co. Ltd . , Alanzol Refine ry, B ream, Nr . Lydney, Glouceste rshire .
Amber Oils Ltd. , l 1 A , Albermarle St. , London, W. 1 .
Ayrton & Co . Ltd . , Beech Street Works , Halifax.
D . Battye & Son Ltd. , Henry St. , Uppe rhead Row, Huddersfield.
Be rry Wiggins & C o . Ltd . , Field Hous e, B reams B uildinss , Fette r Lane, London, E . C . 4 .
B rett ' s Oil & Grease Co . Ltd . , High Level Wo rks , Gateshead 8 . Co . D urham.
6 8
T rade Name
T rans cut 50 T rans cut HM
Kleresol RSK
Kutwell 40
Clearedge
T ranslucol 1 00
F ilmis M F ilmis T F ilmis T CF Filmis 5 0
Gulf E mulsil NT
Se cto sol T Se ctosol 0
Duplex
Cler emo r Solumor A
Maxima Al
Soluble Oil "C "
HOLBROOK 'MINOR' PRECISION LA THE
C onditions of T e st T ype Dilu- Soda '70
tions (Weight) C C
C
M
C
C
M C I M
C
C M
C
C M
C
C
40- 1 40 - 1
40 - 1
40 - 1
40 - 1
40 - 1
2 0- 1 40 - 1 40 - 1 40 - 1
40 - 1
40 - 1 2 0- 1
3 0 - 1
40- 1 2 0 - 1
40- 1
40- 1
Nil i'70
1 0/0
Nil
Nil
N il Nil Nil Nil
N il
Nil N il
Nil
Nil �'70
1 '70
Nil
Supplied by
Alexander Duckham I\t Co . Ltd. , Hamrnel' smith, London, w. 6 .
Engelber t & C o . ( Lubricating Oil) Ltd . , Balfour Hou s e , 1 1 9 & 1 2 5 , Finsbury Pavernent, London, E . C . 2 .
E s s o Petroleum Co . Ltd. , E s s o Hall, Little Aston, Sutton Coldfield , Warwicks .
Fletcher Mille r Ltd . , Alrna Mills , Hyde , Cheshire .
F o rward Lubricants Ltd. , Ault Street , West B rornwich.
Gerrn Lubr icants Ltd . , Bloom St. , Salford , Manchester 3 .
Gulf Oil (Great Br itain ) Ltd. , 6 , Grosvenor Place , London, S . W. l .
A. Hopps Sons & Co. Ltd. , Bel'ey ' s Building s , George St. , Liverpool .
Ingenior s firrna B . Kalveby, Box 2 0 , Varby, Sweden.
Manchester Oil Refine ry (Sale s ) Ltd . , Twining Roaq., T rafford Park, Manche ste r , 1 7 .
Maxirna Lubricants Ltd . , Upton Lodge , Reading Road , Henley-on-Tharnes .
Meteor Oil Co . , Poplar Rd. , Dorr idge , N r . Birrninghafn.
i I .
[
T rade Name
Solvac T Solvac Double One
Lion Keencol
Z alucut
Purfisol No . 1 Purfisol No. 3
Reliance IF 4 0
Royal Snowdrift No . 1
Ste rnopal
Holcut G Solcut x6 Clear D ixol Dixol 5 0
C ensol C
OPERA TION SECTION
Conditions of T e s t T ype Dilu- Soda %
tions (Weight ) Supplied by
C M
M
C
M C
M
I
C
C M
C I
C
C M I
40- 1 2 0- 1
2 0 - 1
40- 1
2 5 - 1 40- 1
2 0 - 1
3 0 - 1
40- 1
40- 1 40- 1
40- 1 2 0 - 1
4 0 - 1
Nil Nil
Nil
Nil
1 % Nil
Nil
Nil Nil
Nil
�%
Nil
Mobil Oil C o . Ltd . , Caxton Hous e , Tothill St. , London, S. W. l .
Thomas Mo s c rop & Co. Ltd. , 1 & 3 , Folds Rd. , Bolton, Lan c s .
Newton Chambers & Co . Ltd. , T ho rncliffe , N r . Sheffield .
Petrofina (Gt. B r itain ) Ltd. , 2 5 , Victoria St. , London, S. W . l .
Reliance Lubricating Oil Co. , Ltd. , Midland Bank Chamber s , 1 40 High St. , Barnet, Hert s .
Snowdrift Lubr icants Ltd . , 4, Chantrey Hou s e , Eccle ston St. , London S. W . 1 .
Sternol Ltd . , Royal London Hou s e , Finsbury Sq. , London E . C . 2 .
Edgar Vaughan & Co. Ltd . , Le gge Street , Birmingham 4.
W akefield-Dick Industrial Oils Ltd . , Castrol Hous e, Marylebone Rd. , London N . W. 1 .
Walkers (Century Oils ) Ltd. , P . O . Box 2 , Hanley, Staffs .
Clear -Type Soluble Oils Milky-Type Soluble Oil s Intermediate-Type Soluble Oils
69
These approvals are bas ed upon tests and expe rience in Coventry. T he best conditions in any lo cality should be a s c e rtained with the oil company concc e rned , supplemented from time to time with Herbert Co rros ion T e sts .
r . r
I
r
I
I . I
L l : f . I
I I _
MAINTENANCE The impo rtance of regular maintenanc e cannot b e stres sed too highly.
On it depends the accuracy, r igidity and life of the machine .
An ideal system is to have a team, working to a planned servicing s chedule , taking control of the maintenanc e of all machines in the machine shop .
All too often machines are kept in use until they finally break down or fail to produc e work within the required tole rance s . When this happens it i s mo re difficult and takes much longe r to re s to re the machine to a fully s erviceable condition.
IMPORTANT
Before any maintenanc e is unde rtaken, ensur e that power supply to the machine is dis connected.
Adjustment of Belt T ens ion
The whole moto r d rive is des igned a s a unit for eas e of maintenanc e .
7 1
Slack belting may b e tightened by lowering the motor . This i s a chieved by releasing two motor fixing studs ( see Fig . 46) , tightening the lower adjusting bolts and , after che cking that the plate is level, r etightening the fixing stud s .
HEADST OCK SPINDLE BEARING ADJUST MENT
Single spindle runs on Prec is ion ' 0 ' T imken taper roller bearing which are pre -loaded at our works to g ive optimum performance . To adjust, ease off belt adjustment, r emove s crew collar retaining driving gear and pulley, remove bearing cover to expo se adjusting collar , loos en lo cking s cr ews and adjust to g ive . 0 0 02 " end float.
It is imperative that the s e are not overadjusted, othe rwise pe rformance on the top range will be affe cted and c ertain damage to bearing s will o c cur.
INDE PEND ENT FEED MOT OR
If, after extended us e , diffic�lty in starting this motor (DC) is experienced, the following check should be mad e .
Isolate Machine. Remove rear cover after withdrawing two s c r ews , this will show the feed motor . Remove flange s c rews , withdraw motor straight out avoiding any cocking . Examine brush gear for sticking o r wear and replace if n e c e s sary, re-ass emble reve r s e of the above .
C O O LANT P U M P
W l l SN F l T T ED
L U B lU C A T I ON
P U lvl P
h'I O T ( : d ; f� I :\ ' [ ' -j ' ( -l l : 1 1
io,- D J U ;;;'!, Li l< I .! ' !
:)-,', 1 ) [ J 1 . 1'.
L: J "..l, t, [ 1-'"
V f\ J U A 'l ' O H ( I l L
J:;' l I . LJ:: I( C ., i '
F L L \. I B L I' . ( : ( ) ( 1 1-' .1 , [ I',h ,
T \\-' l ) ·- S I ' E I : 1 -) ti L :-\ !� t1 U X
tvll1 L i' I - fU jJ j -d : D D IU V E: h t·: ] . 1
}j E _L� [) .sT U C K & G !:� A R U U>': U i L Fl L J . I:;1{ C A 1J
Fig . 4 6 Rear View with lower cove r r emoved
MAINTENANCE SECTION 73
TWO SPEED GEARBOX
This contains thre e electro magnetic clutche s , one stationary with fixed te rminal, the other two energised by two brushe s . These should be examined for wear after an extended period of use and replaced if nec e s sary. A symptom 'of the above is intermittent driving given by periodic energis ation or sticking of brushe s . T o examine, isolate machine , remove rear cover and withdraw motor unit a s a whole unit after dis connecting belt and variable speed actuating drive .
LEAD SCREW T HRUST ADJUSTMENT
Leadscrew thrust adjustment is afforded by a s elf contained , self compensated arrangement built into end bracket, To adjust , unlock collar and turn ins ide sleeve with a pin spann e r until backlash is eliminated and leads crew can just be turned by hand .
SAFETY C LUTCH
This is accurately set before leaving works and s hould not require any adjustment. To examine , disengage leadscrew by removing s crew, remove end cover, withdraw feed shaft after removing end bracket collars . Withdraw thrust washer and spacer, examine spring and clutch for damage or weakn e s s before replacing in reve rse order. NB. If spring has weakened through exces s ive use do not make longe r spacer to r educe working length unles s it is pos itive that s afety clutch will still operate , and that spring is not washered up. Serious damage to fee d motor will occur if thes e precautions are not taken.
'KOPP ' VARIATOR UNIT
The 'Kopp ' variato r unit is guaranteed against faulty material or workmanship for a period of 1"z months . If trouble is experienced with this unit, Holbrook Machine Tool Co . Ltd . , or Allspeeds Ltd . , should be contacted . In any r eference the serial number , stamped on the nameplate of the unit and on the periphery of the end cover flange, should be quoted.
The principal s ervicing requirement of the variator is that of maintaining the correct level of oil in the unit and the changing of the o il at regular intervals . These points are fully d e s cribed in the ' Lubrication ' s e ction of this book.
The variator will run s atisfactorily up to a working temperatur e of 1 80
0F (8Z
oC ) . Running temperature s above this figure are usually caused by high
ambient tempe rature , overloading or slip. T he latter re sults from the use of either the incorrect quantity o r quality of oil or from the need for adjustment details of which are given on page 80 .
74
• 7 8
10 1 1 1 2 1 3 14
HOLBROOK 'MINOR' PRECISION LA THE
I
- - - -- -'
I I
I _ _ _ _ _ _ _ -.-l
18
�--!? -£i;J. I ' I
1 1 1 1 1 I B T- P I .
38 3 8 I
.----+- -1 I 1
L _ _ _ _ _ _ _ _ _ _ -1
HOFFMANN B R N G S . I N A B NGS.
R L 10 L L 1 5 S C I - 8 10 R L 1 4 L L R L S 9 TORRINGTON BR·NG. L L S 8 1 6 B R. 1 2 1 2. L S 8 A.C.D. E W 18 T I M K E N BR'NG. EW '/4 W 12 1 7 387·382 . B PREC . O .
I MATRIX M.S. 4- SINGLE CLUTCH 2 MATR I X M.S. 3 '/16"' SINGLE CL UTCH 3 'MATRI X " BRAK 4 K O P P VAR I AT R TYPF ' M '
SIZE lB. 3 H.P. 3000 R.PM. M A X . 5 DYNAMOTIVE MOTOR 0 8 7 2 /6 .
480 - 4 3 2 0 R.PM.
18 POWER GRIP C O U P -L I NG No.SS. NORTH BRITISH RUBBER CO.
F ig . 47 Gearing Arrangement for the 'MINOR ' Lathe
r ,
l, 1. 1 •
l .
MAINTENANCE SECTION 75
Dismantling the Variator (See Fig . 4 8 ) Remove the drain plug (42 ) and empty the Variato r o f oil .
Place the Variator on wood blocks so that the shafts are ve rtical. The output shaft i. e . the one ne arest the speed c ontr bl should be uppe rmo st.
Remove end cover s c rew (27) from e nd cove r (22) and with a few sharp blows on the Variato r feet with a hide hamm e r detach end cover . (Note : the shaft and bearing a s s e mbly should remain fixed to the end cover ) .
Remove U l S plate (04) by inse rting two Allen s c rews in the tapped hole s provided. T hen guide rolle r s (22 ) , guide balls (2 1 ) , preload spring(s) (34) , roller cage a s s e mbly (23 and 24) , s e c ond preload spring ( s ) (34) and drive cone ( 1 7 ) in that o rd e r .
Remove drive balls ( 1 9 ) and ball spindle s ( 20 ) . Note that drive balls are matched and MUST be kept in sets .
Remove input drive c on e ( 1 7) preload spring( s ) (34) rolle r cage a s s e mbly (2 3 and 24) and s e c ond prelo ad spring(s ) (34). Should it be neces s ary to r e move the retaining ring ( 1 6) the input end cover (03 ) will als o have to be r emoved as the retaining ring cannot be disengaged from the output s id e .
Dismantling the Bearing As sembly
We do not re commend dismantling the bearing a s s emblie s . Howeve r , should it be found neces s ary t o break down eithe r an input o r output ' shaft a s s e mbly it is IMPORT ANT that first the outer radial bearing (30) and thrust bearing (31 ) are removed to allo'w the split c ollar (09 ) to be dis engaged. After this ha s been done the inne r radial bearing ( 30 ) and splined disc ( 1 8) can be removed.
A s s e mbly of the Variator
When ass embling the Variator , it is essential that all wo rking parts are lubricated with the specified Variator oil . GREASE MUST NEVE R BE USE D .
If the bearing a s s embly has been dismantled , reas s emble using th e rever s e procedure to that de s c ribed on the oppo s ite page . Care should be taken to ensure that the thrust bearing race with the smaller bore
7 6 HOLBROOK 'MINOR' PRECISION LA THE
is fitted to the split collar . When pre s s ing the r adial bearings On to the shafts a washer which bridge s both the oute r and inne r race should be used to prevent preloading the bearing.
Loosen lo cking screws (43 ) and s c rew back the adjusting dis cs ( 1 5 ) in the end covers until they are 1 / 1 6 " ( l . 5mm) proud of the end of the bo s s . The s haft a s s e mblies can now be pushed home into their r e s pe ctive end cove-s (02 / 0 3 ) .
Place the Variator in the s ame po s ition a s for dismantling . If the r etaining ring ( 1 6 ) has previously been removed this will fir st have to be replaced from the input end and the input e nd cover ( 0 3 ) fb:ed to the body. A good quality sealing compound should be used.
Replace Clutch Assembly in the following orde r : -
Preload spring ( s ) ( 34 ) , rolle r cage a s sembly (2 3 , 24 and 2 5 ) P r e lo ad spring ( s ) ( 3 4 ) , and drive cone ( 1 7 ) .
IMPORTANT NOT E : Refe rence should b e made to the drawing fo r the exact o r ientation of the preload spring s .
Having fir st placed a matched set of drive balls ( 1 9 ) on to the ball spindles ( 2 0 ) and ne edle bearings ( 3 3 ) lowe r the ball spindles ( 2 0 ) gently into po s ition inse rting the squar e ends of the spindle s into the input end cover ( 0 3 ) s lo t s . S e t all spindles approximately ve rtical and raise the r etaining r ing ( 1 6 ) to encompa s s the drive balls ( 1 9 ) .
Lay the output drive cone ( 1 7 ) on the drive balls ( 1 9 ) now held in po s ition by the r etaining ring .
Replace iris plate (04) thr e ading car efully over the end of the ball spindle s (2 0 ) . T hen r eplace guide balls (2 1 ) and guide rolle rs (22 ) .
Lay the first preload spring ( s ) ( 34 ) , roller cage a s s embly (2 3 , 24 and 2 5 ) and s e cond pr eload spring ( s ) ( 34 ) on top of the output drive cone taking care to centre the s e accurately with the bore of the cone .
Coat thinly the inner face of the end cover flange ( 0 2 ) with a good quality s ealing compound and or ientate the end cove r (02 ) until the dowel is in line with the lo cating hole in the body ( 0 1 ) . Now carefully ins e rt the inne r end of the output shaft a s s embly into the output dr ive cone ( 1 7 ) endeavouring to ensure at the s ame time that the clutch rollers are at the bottom of the ramps in the drive cone ( 1 7 ) and s pUned disc ( 1 8 ) . Bed the end cover down to the body and drive home the dowel ( 2 9 ) then tighten the end cove r s c rews (2 7 ) as unifo rmly as po s s ible .
r
l I
i , ,
MAINTENANCE SECTION 77
If difficulty is expe r ienced in bedding -down the end cover ( 0 2 ) gently rotate th e output shaft in both dire ctions to ensure that the clutc h rollers ( 2 5 ) are corre ctly engaged in the ramp s .
Adjus tment
Proceed to eliminate backlash as follows . Using the key provided s c r ew in both adjus ting dis cs ( 1 5 ) until they are flush with the end cover bo s se s . Rotate the output shaft by hand and carefully move the s peed control to the highest output speed po s it ion.
T e st fo r rotational backlash betwe en the input and output s hafts by rotating them in oppo s ite direction s . If this is more than two o r three degrees it must be eliminated by s c rewing in the input and output adjusting dis cs ( 1 5 ) equally. When this is done ensure that the shafts rotate free ly when turned by hand. The adjus ting d i sc locking s crews (43) should then be firnnly tightened.
Refill to the co r r e ct oil level and if po s s ible run the Variator without load for 6 hours before putting into s e rvice . After this running in period che ck the adjustment again and r e -tighten all the end cover fixing s crews .
Should the Variator have a tendency to lo se speed under load , the adjustment r equir e s tightening still furthe r and the adjusting dis c s ( 1 5) should the refore be g radually s cr ewed in until slipping is e linninated.
r
I
[ !
APPENDIX A
ERRATA
1 . Founda t ion D iagram , F ig . 2 , page 10 .
Th is is replaced by the d iagram shown on she e t ( ii ) .
2 . O i l ing D iagram , F ig . lO , page 18 .
Th is is replaced by the d iagram shown on she e t ( ii i ) .
3 . Control o f Spindle Spe e d , page 3 8 .
The var iable spee d contro l knob shown in F ig . 2 2 , 2 3 and 2 4 i s replaced by a handwhee l mounted o n the front o f the cab ine t .
( i )
To incre ase spindle spe e d , turn the handwhee l c lockwise . The max imum number o f turns availab le , from lowe s t to h ighe s t speed in e ach range , is 1 3 ;' .
4 . Formula for Spe c ia l P itche s , page 4 2 . The formula should re ad :
N =
Requ ired T . P . I . x 2 A x C B x D
5 . Formula for Me tric P itche s , page 4 2 . The formula should read :
EM/OS
p itch reguired in mm
( 1. x 2 5 . 4 ) x 2 N
whe re A = 60 B 1 2 7
cons tant
= A x C B x D
- <
� I , :::> - �
0..... I --- fr-
�-.
1 1 'I ;to; li
\( :: .. � , .. 1.'coJ1 If---
- - ---- . IAA "lU
.. -
r-. --
f&
1 I "
. .
� IV .".,
� '-'t f"
1 , I
3 � 3 2: -( I (J O B - 3 M'M)
- - - --
�
'UWJ i
App . A ( i i )
. . 5>
)
O I L S I G H T G L ASS
� �< I-�
- ---.�- .
1-- - -�
1 1
I ,
l 'L
�7
1 1 1 , I \1 1 1 " I
I:;.;:r j l 1 1 d
-= -=-::- J
O i l i ng D iagram .
A
PRESS TO OIL
IS T IM E S DAILY
� LT,
O I L FI LT E R AN D
PU M P
A
."pp . 1\ ( i i i )
K EEP FULL W I T H
S H E L L T EL L U S
c.,=,
� "1;.11 --
�
c
�
lhE;'-l)-"r R "
IP '-. r l "'"
'-- J I /
---r------. C L EAN F I LT ER
EVERY TWO WEEKS
-
�
1"".,< 1 .+ ,
U ,/
tI ® @
U S E SHE L L
E N S I S 30
DRAIN PL UG
/c � --cQ)
T l i ! F'I
r I
r l . I
i ( ,
APPENDIX B
ADDENDA
l . Lubr ica t ion, pages 19 to 2 1 .
T h e Eo L low I n cr d iagram o f the He ads tock O i l ing Sys tem is added for i n fn t1na t- .Lon .
P n?- S B u re Re le a se Valve .
( i )
'� -- - -- - - - l
....... "1,:::- _ _ __ __ _ __ _ _ "'
1 1 /1 -
- - - - - ' , 1 1 A d j u s table Re strictor .
l\ rl -j l 1 R t <=th l.p Re s t. I.' i,c tot" . " �ll __ "_
I
�-----+I �--------- P ump . 'I 1 11 l" I
J 1 1 1
:t �� ':_� _��=:;::�bJ;:..J � ( ) i I Supp J Y L..,.. __ _ __ __ __ - __ J
t " He ad £ 1'0\11 (�e a rbox .
nr; A I J S'l'nCK O H,ING SYSTEM .
"2 , AdcH t .. Lona l Eq1.1 ipme nt .
FAST C(lT,[,ET I\TTACHMENT
( 1 ) F i t f a s t collet a ttachme nt to machine . ( 2 ) se le ct collet and fit to attachment . ( 3 ) P lace workp ie ce in c o l le t .
Ad j us tab le Re str icto.r .
( 4 ) Adj u s t attachme nt by me ans o f adjus ting s le eve unt il workp ie ce is j us t be ing he ld by co l le t .
( � ) Move the adj u s t ing p late approximate ly 2 holes on the thru s t. p late by d isengag ing the locat ion p in .
( (, ) Lock in pos i t ion w ith lever arm . ( 7 ) ,:hp cJ< t o see i f: workp iece is se cure in c o l le t , i f 1101' ,
ad j u s t t he ad j u s t ing s le eve s t i l l furthe r .
App . B ( i i ) S IX STATION STOP ATTACHMENT .
w z . -- . r' I---
n 0 EEl"
I--- il -
=J '- u
IMPORTANT .
Thi s attachme nt can only be use d when the 3 - j aw chuck is in use .
S top rods can be adj u s te d , by shortening , to suit requirements .
Cap s c rews can a lso be used as stop rods , the se are � in . BSF ( For wh it machine s ) or 6mm dia . x lmm pitch ( For me tric machine s ) .
To ope rate , push handle in dire ction of arrow ' A ' towards the centre o f the machine , unt il the plunge r engage s in pos ition . The n pull the handle in dire ction o f arrow ' B ' to the next station . The handle then remains in the forward pos i t ion until i t is next require d .
An alternative s top mechanism that is fitte d to the top of the ge arbox is ava ilable for use with Colle t s .
llM/OS
APPENDIX C
METRIC MACHINE
1 . Change Ge ars and Ge a rbox Se ttings .
( i )
She e t s ( i i ) , ( i i i ) and ( iv ) conta in cha rts for E ng l ish, diame tral and me tric module p i tche s corre sponding to the cha rts g iven in F ig s . 2 6 and 2 7 .
2 . Ge ar ing Layout .
She e t ( v ) g ive s the g e a r ing layout for the m e t r i c mach ine corre s ponding to F ig . 4 7 .
BM/OS
T P I Required
64
60
5 6
5 2
4 8
44
40
3 6
3 2
Change Ge a r .s and Ge arbox S e t t .�.ngs For E ng l i s h P i tche s .
Ge arbox
Se t t ing
. 2
. 2
. 2
. 2
. 2
. 2
. 4
. 4
. 4
. 4
T rans .
B
108
108
lOB
lOB
108
10 8
108
108
108
lOB
lOB
108
C
7 5
100
100
100
100
100
100
100
7 5
100
100
100
Ge a r s D
8 4
10 5
5 8
9 1
B 4
7 7
70
6 3
84
105
98
9 1
5 6 T
140T I '",
App . C . ( i i )
60T - .3..-/' SP INDLE
1.----- 9 BT
98T
30
2 8
2 6
2 4
2 2
2 0
1 8
1 6
. 4
. 4
.108 lOO 84 c -.. ---- B
1 5
1 4
1 3
1 2
1 1
10
9
B
. 4
. 8
. 8
. 8
. 8
. 8
. 8
. 8
. 8
. B
108
l08
108
108
Loa
lUd
lOB
108
lOB
108
108 10,S
100
lOC lOO
'"/ 5 100
1.CO LOO
100
lOO 100
lOO '"1 C , -,
7 7
7 0
1 0 =';
9 f3
9 :1.
84
7 7
70
f.l4 '-------------_._----------_._--------_._._.-
U s e upper r ange o f thre a d p l a te .
+-+-+
� L .-- D . ott GEARBOX
E x tra change g'e a r s require d : 5 6 , 6 3 , 7 0 , 7 5 , 7 7 , B4 , 9 1 ,
H"M In"
9 8 , 100 , 105 ., 108 ,
D . P . Requ ired
16
1 8
2 0
2 2
2 3
2 4
2 8
30
3 2
36
40
44
46
4 8
5 6
60
6 4
7 2
80
Change Ge ars and Gearbox Se t t ings For D i ame tra l P i tche s .
Ge a rbox S e t t ing
2
2
2
1
1
1
1
1
1
1
1
. 5
. 5
· 5
. 5
· 5
· 5
. 5
· 5
Trans . B C
I I I 90
100 8 5
1 1 1 8 4
9 6 90
1 10 10 5
1 12 104
9 4 86
1 10 100
I I I 90
100 8 5
I I I 84
9 6 90
1 10 10 5
1 1 2 104
9 4 8 6
1 10 100
I I I 90
100 8 5
1 1 1 8 4
Ge a r s D
7 8
9 2
9 1
6 2 .
6 6
6 7
7 7
8 2
7 8
9 2
9 1
6 2
6 6
6 7
7 7
8 2
7 8
9 2
9 1
Use lowe r range o f thread p l ate .
C
E xt r a change ge a r s require d : 6 2 , 6 6 , 6 7 , 7 7 , 7 8 , 8 2 , 84 , 8 5 , 8 6 , 90 , 9 1 , 9 2 , 9 4 , 9 6 , lOO , 104 , lO S , l lD , 1 1 1 , 1 1 2 .
HM/OS
D
App . C . ( ii i )
SP INDLE
60T
98T
98T
B
GEARBOX
f'le t r i c Module Regu ired
2
1.,
1
k 8
Change Ge a r s and Ge a rbox Se tting s For Me tric Module P itche s .
Ge arbox Se tt ing
4
3 . 5
3 . 2 5
3
2 . 7 5
2 . 5
2 . 2 5
2
1 . 7 5
1 . 5
1 . 2 5
1
. 7 5
. 5
'rrans . Ge a r s B C D
1 2 0 7 7 98
120 7 7 9 8
1 2 0 7 7 9 8
1 2 0 7 7 9 8
1 2 0 7 7 98
1 2 0 7 7 98
1 2 0 7 7 98
120 7 7 9 8
1 2 0 7 7 9 8
1 2 0 7 7 9 8
1 2 0 7 7 9 8
1 2 0 7 7 9 8
1 2 0 7 7 9 8
1 2 0 7 7 9 8
E xt r a change ge a r s require d : 7 7 9 8
u s e lowe r range o f thr e a d p l a te .
App . C . ( iv )
60T A
SP INDLE
B
C
GEARBOX
D
E xtra ge ars requ i re d for Eng l ish D iame tral and Module P itche s :
5 6 , 6 2 , 6 3 , 6 6 , 6 7 , 7 0 , 7 5 , 7 7 , 7 8 , 8 2 , 8 4 , 8 5 , 86 , 9 0 , 9 1 , 9 2 , 94 ,
9 6 , 9 8 , 100 , 104 , 10 5 , 108 , 1 1 0 . I l l , 1 1 2 .
HM/OS I s sue 2
,, - I
_ J
__ _ _ .-I
GE.lI.RING LAYOUT
I � �
E;. 9 I,e. l / ,2-I� 2 .. � 2.' ,.
I ., �
i � !;
f-
).i O r: � ).,j.�NN 1:\ I,... � .. il L I A. L L R L S S S
e-L S e. .\C. c Ii.W SIe, IOW ::>14-i'il( 2 5 � L � I.L
I LL
App . C ( v )
MAiRI� "'� 4 SII<IGLE CLVTC� �ATR\, '" ... "1 ..... , ... t> " rl I rrr" t.<,U11IlI •
K <> PP � R I ATOR -,,1 .. A
Tt M 0 "''''
"AC." O N A L � p. l1 o,oR !<. D.M . M A rt . i," ioU>.
-"
'N 1( ... \5 �C.I � · 10 I!I!> 1oI l\. ,,\2oC 4
'"T'O�W.\M6 ON , \
M A1.
�
" M!<.EN 1'!; 12.!>Iti' r7 "!'B7-�Z. J3
\>1< SO c. ..,., I
· 'MINORJ PRECISION LATHE
SPARE PARTS LIS T
H OL B R O O K M ACH I N E TOO L CO. LTD. CAM B R I DGE ROAD, HARLOW, /27v'l a member of
ESSEX, E N G LAN D. 1Uf7.../ tM HERBERT group
GEARBOX ASSEMBLY (Plates S. P.20075-6)
MAIN SPINDLE (Place S . P.20073)
BED ASSEMB LY (Plate S.P.20070)
CHANGE GEAR ASSEMBLY (Plate S . P .20074)
APRDN ASSEMBLY (P late S. p.200n)
CARRIAGE AND SLIDE ASSEMBLY (Plate S . P .20078)
The Hol brook 'MINOR' Precision Lathe
� �
WHEN ORDERING SPARES PLEASE QUDTE INSPECTION NUMBER FDUND H E R E.
------,
'"
Bed Assem b l y ( P l ate S . P.20070)
Reduction and Variator Uni ts ( P lates S . P.20071 -2)
Main Spi ndle ( P l ate S . P . 20073)
Change Gear Assembly ( P late S . P .20074)
Gearbox Assembly ( P l a tes S . P .20075-6)
Apron Assembly ( P late S . P . 20077)
Carriage and S l ide Assembly ( P l at e S . P .20078)
C o l l e t Asse m b l i es ( P l a te S . P .2(079)
Tai lstock Assemb l y ( P late S . P .20080)
Chasing D i a l and Coolant Pump ( P l ate S . P . 2008 1 )
Taper Turning Equipment ( P l ate S . P . 20082)
I N 0 E X
I M P O R T A N T WHEN ORDERING SPARE PARTS IT IS ESSENTIAL TO QUOTE :-
1 . INSPECTION No. of the machine for which the part is required. This is stamped on the machine as shown in the illustration at the front of this book.
2. R EFERENCE No. of the part as listed in this book. The reference number i s useless a s a n identification unless the INSPECTION N U M BE R is also quoted.
3 . THE TYPE AND SIZE OF T H E MACHINE on older types where the I nspection number may have been removed during reconditioning. This information should be accompanied by a dimensioned sketch of the part required or the damaged part itself sent to us.
4. HOW MANY S I M ILAR PARTS A R E REQUIRED.
NOTE : The i l lustrations in this list are not necessarily correct in detail owing to alterations in design, but if the above information is given the correct part wil l be su pplied.
Pages
4 - 5
6 - 9
1 0 - 1 1
1 2 - 1 3
1 4 - 1 7
1 8 - 1 9
20 - 21
22 - 21
24 - 25
26 - 27
28
3
, ,
" , 05 ,
� - - - - - - - - -
66 , "
,
/
I I I
Plate S.P. 20 070
4
� ----,
BED ASSEMBLY - P l ate S.P .2Q070
Ref.No. Part Ref.No. Part Ref.No. Part 1 Screws 36 Tommy Bar 70 Screw Col l ar 2 Handle 37 Bracket 71 B a l l 3 P l ug 38 O i l Sight G l ass 72 Washer 4 Housing 39 Screws 73 Grub Screws 5 Spacer 40 Pins 74 Oi ler 6 Springs 4 1 Screws 75 Washer 7 C i rc l i p 42 Instruct ion Plate 76 Leadscrew Nut (bottom) 8 Taper Pins 43 Apron Body 77 Leadscrew Nut (toP) g Shaft 44 G i b Screw 78 P i n
1 0 Universal Joints 45 Screw 7 9 Locking Bar 1 1 Shafts 46 Oi l P l u g 8 0 Cam 1 2 Screws 47 Strainer 81 P i n 1 3 Control Plate 48 Knob 82 Taper Pin 14 Knob 49 Feed Shaft 83 Sleeve 15 Feed Warn ing Light 50 Cam Handle 84 Simpl i l i x f i t t i ng 1 6 Mains Warn ing L i gh t 5 1 Leadscrew Nut Plate 85 Copper Tube 1 7 Cover 52 Screws 86 E l bow 1 8 Cover 53 C l amp G i b 87 Bal l s 1 9 Nuts 54 Leadscrew 88 Grub Screw 20 Studs 55 Screws 89 Screws 2 1 Head 56 Bed 90 Spring 22 Rear Cover 57 Bearing 91 P l ug 23 Rack 58 Radius Washer 92 Pl unger 24 Instruction Pl ate 59 Screws 93 Grub screws 25 Name P l ate 60 Taper P i ns 94 Pump Body 26 Screws 61 Thrust Col l ar 95 Bush 27 P i ns 62 Screw 96 O i l Seal 28 Apron Front 63 Bearing 97 Handle 29 Switch 64 Cabinet 98 Screws 30 Switch 65 P l u g 99 Bal l s 31 Switch 66 Bearing 100 Grub Screw 32 Screws 67 End Bracket 1 01 Cover 33 Grub Screws 68 Cover 1 02 Adj usting Pad 34 Locknuts 69 Adj usting Cap 1 03 O i l Sight G l ass 35 Key
I M PO RTANT - W H E N O R D E R I N G S PA R E S ALWAYS O U O T E I N S P E C T I O N N U M B E R OF M A C H I N E 5
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REDUCTION AND VARIATOR UNITS - Plate S. P.20,o71
Ref-No. Part Ret.No. Part Ret.No. Part 1 1 0 Pipe 1 27 Sleeves 144 Vee Belt 1 1 1 Connector 128 Male Stud tee 145 Top cover 1 1 2 Nut 129 Cover 146 Oil ti l ler 1 1 3 Housing 130 screws 1 47 Reduction box 1 1 4 Stud 131 Bolts 1
"48 Bolts
1 1 5 Connector 1 32 Vari ator 149 Bolt 1 1 6 Tube 133 Coupling 1 50 Bracket 1 1 7 Spri n9 134 Key 1 51 Studs 1 1 8 Strainer 135 Air vent 1 52 Washers 1 1 9 El bow 136 Cover stud 153 Locknuts 1 20 Magneti c f i lter 137 P i pe 1 54 Plate 1 2 1 Cap 1 3 8 E l bow 1 55 Bolts 1 22 Seal 139 E lbows 1 56 Strip 1 23 Ball 140 Knob 1 57 Pipe 1 24 Screw 141 Bar 158 El bow 125 Cover studs 1 42 C l i ps 159 Oi l Tray 1 26 Nuts 143 Screws
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MAIN SPINDLE - Plate S. P.20073
Ref.No. Part Ref.No. Part Ref.No. Part 230 Key 243 Collar 256 Cup 231 Grub Screw 244 Grub Screw 257 Bearing 232 worm Wheel 245 Cap 258 Housing 233 Spindle 246 Pulley 259 Screws 234 Cam Lock 247 Gear 260 Pins 235 Grub Screws 248 Grub Screw 261 Plate 236 Spring 249 Tachometer 262 Washer 237 P lunger 250 Cover 263 Screw 238 Sleeve 251 Screws 264 Pin 239 Centre 252 Collar 265 Tee Bolt 240 Cover 253 Screws 266 Screws 241 Tube 254 Bearing 267 Plug 242 Connector 255 Cup
IM PO RTANT - WH E N O R D E R I N G SPARES ALWAYS QUOTE I N S P E CTION N U M B E R O F MAC H I N E 1 1
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CHANGE GEAR ASSEMBL Y - Plate S.P.2Q074
Ref.No. Part Ref.No. Part Ref.No. Part 270 Knob 288 Gear 305 Housing 271 Col l ar 289 Grub Screw 306 Gears 272 Grub Screw 290 Washer 307 Key 273 Grub Screw 291 Nut 309 Spacer 275 Washer 292 Washer 3 1 0 Sleeve 276 Spring 293 Collar 3 1 1 Washer 278 Bal l 294 Stud 3 1 2 Washer 279 Pin 295 Shaft 3 1 3 Screw 280 Shaft 296 Key 3 1 4 Rollers 281 Bracket 297 S leeve 315 P i n 282 Stud 298 Beari ng 3 1 6 Stud 283 Pin 299 Screws 3 1 7 C l ip 284 Screw 300 Quadrant 3 1 8 Rivet 285 Washer 302 Key 3 1 9 Washer 286 Needle Bearing 303 S leeve 320 Oi ler 287 Gear 304 Seal
I M PO RTANT - W H E N O R D E R I N G S PA R E S ALWAYS QUOTE I N S P E CT I O N N U M B E R O F MAC H I N E 1 3
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GEARBOX ASSEMBLY - Pl ate S.P.20.075
Ref.No. Part Ref.No. Part Ref.No. Part 325 Bear i n g 351 Knob 376 Grub screw 326 C i rc l i p 352 Pin 377 Selector 327 Gear 353 Locking P i ece 378 Tube 328 Shaft 354 Screw 379 Grub screw 329 Spacers 355 Shaft 380 Rack 330 Plate 356 Key 381 Shoe 331 B l ock 357 Grub Screw 382 Pin 332 Screws 358 Dial 383 Shoe 333 Bearing 359 Spring 384 Grub screw 334 Gear 360 Bal l 385 Spring 335 Bush 361 Screws 386 Lever 336 Gear 362 cap 387 Rack Pin ion 337 C i rcl i p 363 screw 388 Key 338 Bush 364 Gear 389 Sleeve 339 Gear 365 C i rc l i p 390 Screws 340 Shaft 366 Bearing 391 Ba l l 341 Grub Screw 367 Shaft 392 Spri ng 342 P i n 368 C l u tch 393 Grub screw 343 Bush 369 Gear 394 Shaft 344 End Cap 370 Bearing 396 Dial 345 Leadscrew 371 Shaft 396 C i rcl ip 346 Lever 372 Bearing 397 Key 347 Shoe 373 Lever 398 Dial 348 Shifter 374 Bal l 399 Screw 349 Screws 375 Gear 400 Screw 350 Bearing
I M PO RTANT - W H E N O R D E R I N G SPARES ALWAYS QUOTE I N S P ECTI O N N U M B E R O F MAC H I N E 1 5
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Plate S.P. 20 076
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GEARBOX ASSEMBLY - Plate S . P .2Cj076
Ref.No. Part Ref.No. Part Ref.No_ Part 405 Motor 428 Gear 451 O i l i te Bush 406 Sleeve 429 Spacer 452 Bearings 407 Key 430 Bearing 453 Worm 408 Seal 431 Bracket 454 Screws 409 Housin9 432 B l ock 455 Pins 4 1 0 Bearing 433 Bearing 456 Screws 4 1 1 Screws 434 Rack 457 Block 4 1 2 Bearings 435 Rack 458 Spring 4 1 3 Shaft 436 Shaft 459 Lever
· 4 1 4 Spacer 437 Key 460 Worm Wheel 4 1 5 Gear 438 Washer 451 Bush 4 1 6 Sleeve 439 Washer 462 C l u tch 4 1 7 Spacer 440 Screw 463 Knob 4 1 8 Gear 441 Key 464 Spring 41 9 Gear 442 Grub Screw 465 Sleeve 420 Gear 443 Col lar 466 Bearing 421 Gear 444 Circ l i p 467 Feed Shaft 422 Spacers 445 Spacer 468 C i rc l i p 423 Gear 446 Bearings 469 '0' R i ng 424 Gear 447 Bracket 470 O i l i te Bearing 425 Gear 448 Screws 471 Shaft 426 Gear 449 Col l ar 472 O i l i te Bearing 427 Spacer 450 Grub Screw 473 Screws
I M PO RTA N T - W H E N O R D E R I N G S PA R E S ALWAYS QUOTE I N S P E CTI O N N U M B E R OF M AC H I N E 17
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Plate S.P. 20 077
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APRON ASSEMBLY - Plate S . P .2O,077
Ref.No. Part Ref.No. Par! Ref.No. Par! 480 Screw 508 Bush 536 Cl utch Gear 481 Handle 509 Screws 537 Clutch Gear 482 Coliar 510 Bal l s 538 Screw 483 Grub Screws 5 1 1 Sleeve 539 Cap 484 Grip Shaft 5 1 2 Washer 540 Worm Wheel 485 Grub Screw 513 Screw 541 Key 486 Grip 5 1 4 Screw 542 Pin 487 Handwheel 5 1 5 Knobs 543 O i l Seal 488 Key 5 1 6 Levers 544 L . H . Sleeve 489 Housing 517 Cam Shoe 545 Washer
490 Ba l l 5 1 8 Ext Circ l i p 546 Gear 491 Spring 5 1 9 Spacer 547 Gear
492 Grub Screw 520 Cam 548 Bush
493 Dial (Metric) 521 Bush 549 O i l Seal 493 Dial (Whit) 522 Shaft 550 Button 495 Screw 523 Key 551 Plunger 496 Shaft 524 Spring 552 Washer 497 Cap 525 Gear 553 Screw 498 Bush 526 Gear 554 Gr_ub Screw 499 Bush 527 Taper P i n 555 Spring 500 Shaft SI ide 528 Shaft 556 Ball 501 Bush 529 Key 557 Taper Pin 502 Gear 530 Bush 558 Worm 503 Grub Screw 531 Gear 559 Washer 504 Gear 532 Bush 560 Sleeve 505 Taper Pin 533 Plug 561 Screws 506 Grub Screw 534 Shaft 562 O i l Seal 507 Cl utch 535 Bush
IMPORTANT - W H E N O R D E R I N G SPARES ALWAYS QUOTE I N S P ECTION N U M B E R O F MAC H I N E 1 9
®---S75 ®--576 r®YJ577 [)-578 [579 56, Q
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Plate S.P. 20 078
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CARRIAGE AND SL IDE ASSEMBLY - Plate S.P .20078
Ret.No. Part Ref.No. Part Ref.No. Pari 575 Nut 601 Taper Pins 627 Screws 576 Washer 602 Hand l e 628 Surface S l i de G i b 577 Tripan Block 603 Handle 629 Top SI ide Nut (Metric) 578 Spigot 604 Dial Sleeve 630 Pins 579 Tee-Bolt 605 Screws 631 Taper Pin 580 Pin 606 Micro D i a l (Metric) 632 Carriage 581 Saddle Clamp 607 Micro Dial (Wh i L ) 633 Surface S l i de Screw (WhiL) 582 Stud 608 D i a l Bracket 634 Surface S l i de Screw (Metric) 583 Washer 609 O i l i te Bearing 635 Gear
584 Domed Nut 6 1 0 Top S l i de Screw (WhiL) 636 Spacer 585 Top S l ide 6 1 1 Top S l i d e Screw (Metric) 637 Bearing 586 Top S l i de Screw (Metric) 6 1 2 G i b Screws 638 Bracket
587 Top S l i de Screw (WhiL) 61 3 Top S l i d e G i b 639 O i l i te Bearing
588 Key 6 1 4 Top S l i de N u t (Wh i L ) 640 Screws
589 Screw 6 1 5 Swivel S l i d e 641 Beari n9 590 S l eeve 6 1 6 011 Plug 642 Knurled Screw
591 Top S l id e Bracket 6 1 7 Locknuts .
643 Dial Sleeve
592 Quick Start Screw 6 1 8 Surface S I i d e 644 Taper P i n 593 Handle 6 1 9 swivel P i n 645 Handle 594 Sleeve 620 Screw 646 Handle 595 Grub Screw 621 Screw 647 M i cro-Dial (Wh i t .) 596 Plate 622 Surface S l i de Nut (Whit.) 648 Micro-Dial (Metric) 597 Knurled Screw 623 Surface S l ide Nut (Metric) 649 Bed Wipers L . H . 598 M i cro D i a l (Metric) 624 Screws 650 Bed W i pers R . H . 599 Micro Dial (Wh i t. ) 625 Saddle Pad 651 Screws 600 D i a l Sleeve 626 P I U9 652 O i l ite Bush
I M PORTANT - WH E N O R D E R I N G SPARES ALWAYS QUOTE I N SPECTION N U M B E R OF MACH I N E 21
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COLLET ASSEMBLIES - Plate S.P.2Q079
STANOARD DRAW COLLET EQUIPMENT FAST COLLET EQUIPMENT
Ref.No. Part Ref.No. Part Ref.No_ Part
655 screws 664 Sleeve 676 Sleeve
656 Handwheel 665 Bracket 677 Bearing
657 Pins 666 P i n 678 Shoes
658 Bearing 667 P i n 679 P i n
659 Housing 668 Locating P i n 680 Bracket
660 Sl eeve 669 Spring 681 Grub Screw
661 Grub Screw 670 Sleeve 682 Col l ar
662 S l eeve 671 Key 683 Circlip
663 Co l l e t %" to % I J 672 Rol l ers 684 Lever Arm (Please advise s i ze when ordering) 673 Ba l l s 685 Knob
674 Sleeve 686 Pin 675 Circl i p 687 Plate
688 Screws
I M PO RTANT - W H E N O R D E R I N G SPARES ALWAYS QUOTE I N S P ECTION N U M B E R OF MACH I N E 23
695 <C:::::::J:?96 697 701 700�
o 702 704 699
698
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Plate S.P. 20 080
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TAI LSTOCK ASSEMBLY - P l ate S . P .2QD80
Ref .No. Part Ref. No. Part Ref.No. Part 695 O i l Seal 7 1 1 Grip Shaft 726 Eye Bolt 696 Centre 7 1 2 Handwheel 727 Washer 697 Plunger 713 Lever 728 Nut 698 Pad Bolt 714 Plate 729 Clamp Pad 699 Pad Bush 7 1 5 Screw 730 Base 700 Cap 716 Grub Screw 731 Plunger Key 701 Screw 717 Grip 732 Screws 702 Lever 7 1 8 Grub Screw 733 Screw 703 O i ler 719 Pin 734 Body 704 Knob 820 Eccentric 735 Lead.crew (Wh i t . ) 705 Key 721 Bal l 736 Leadscrew (Metric) 706 Bearing 722 Spring 737 Screw Nut (Whit.) 707 Cap 723 Screws 738 Screw Nut (Metric) 708 Knurled Screw 724 Gib Screw 739 P i n 709 Micro Dial (Wh i t . ) 725 Gib 740 Oi ler 7 1 0 Micro D i a l (Metric)
IMPORTANT - WH E N O R D E R I N G SPARES ALWAYS QUOTE I N SPECTION N U M B E R OF MAC H I N E 25
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CHASING D I A L - Plate S . P.20,o8 1
Ret.No. 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771
part Screw Dial Circlip Washer Oi l i te Beari ngs Body Shaft Screws Stand Pipe Assy. Screws Bracket Simpl i f i x F i tt ing Pipe Simplifix Fitt ing Adaptor Bolt Rear Bracket Front Bracket Screws Pump Washer Gasket
IM PORTANT - WH E N O R D E R I N G SPARES ALWAYS QUOTE I NSPECTION N U M B E R OF MACH I N E 27
Fief.No. 772
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Plate S.p. 20. 082 T"'PEI1. iliFlNING EQUIPME;NT (A.Dorn",,, l) �"A . Plate S,P.20fJ82
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781 Nuts 782 Tee 30lts � .--.......,.-,
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