Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. इंटरनेट मानक “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda “Invent a New India Using Knowledge” “प0रा1 को छोड न’ 5 तरफ” Jawaharlal Nehru “Step Out From the Old to the New” “जान1 का अ+धकार, जी1 का अ+धकार” Mazdoor Kisan Shakti Sangathan “The Right to Information, The Right to Live” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 12295 (2000): Acceptance Conditions for External Cylindrical Centreless Grinding Machines - Testing of the Accuracy [PGD 3: Machine Tools]
Transcript
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 12295 (2000): Acceptance Conditions for ExternalCylindrical Centreless Grinding Machines - Testing of theAccuracy [PGD 3: Machine Tools]
Indian Standard
ACCEPTANCE CONDITIONS FOR EXTERNALCYLINDRICAL CENTRELESS GR-INDING
MACHINES -TESTING 0-F TH-E ACCURACY
( First Revision )
ICS 25080.50
0 BIS 2000
B U R E A U O F INDIAN STA~NDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
July 2000 Price Group.7
Machine Tools Sectional Committee, BP 03
NATIONAL FOREWORD
This Indian Standard which is identical with IS0 3875 : 1990 ‘Acceptance conditions for external cylindricalcentreless grinding machines - Testing of the accuracy’ issued by the International Organitation forStandardization (ISO) was adopted by the Bureau of lnidan Standards on the recommendation of theMachine Tools Sectional Committee (BP 03) and approval of the Basic and Production EngineeringDivision Council.
This standard was first issued in 1988 based on 1980 version of IS0 3875. IS0 Standard has sincebeen revised which necessitated the revision of the standard. The standard was earlier titled as: “Testchart for external cylindrical centreless grinding machines”. The title has been changed to bring it in linewith IS0 title.
The text of the IS0 Standard has been approved as suitable for publication as Indian Standard withoutdeviations. Certain conventions are, however, not identical to those used in Indian Standards. Attentionis particularly drawn to the following:
a)
b)
cl
d)
Wherever the words ‘International Standard’appear referring to this standard, they should be readas ‘Indian Standard’.
Comma ( , ) has been used as a decimal marker in the International Standard, while~in Indian Standards,the current practice is to use a point ( . ) as the decimal marker.
Inch dimensions as given in the above IS0 standard have not been included as the same are not-prevalent in the country.
French, Russian, German designations in Table 1 have been deleted while adopting it as IndianStandard.
In this adopted standard, reference appears to certain International Standards for which Indian Standardsalso exist. The corresponding Indian Standards which are to be substituted in their place are listedbelow along with their degree of equivalence for the editions indicated.
International Standard Corresponding Indian Standard Degree ofEquivalence
IS0 230-l : 1986 Acceptancecode for machine tools - Part 1 :Geometric accuracy of machinesoperating under no- load orfinishing conditions
IS0 1101 : 1983 Technicaldrawings -Geometrical toleranc-ing - Tolerancing of form,orientation, location and run-out -Generalities, definitions, symbols,indications on drawings
IS 2063 : 1988 Acceptance code for machinetoois - Geometric accuracy of machinesoperating under no-load or finishing conditions( first revision )
Identical
IS 8000 ( Part 1 ) : 1985 Geometrical toleranc-ing on technical drawings : Part 1 Tolerancingof orientation, location and run-out andappropriate geometrical definitions
do
IS 12295 : 2000IS0 3075 : 1990
Indian Standard
ACCEPTANCE CONDITIONS FOR EXTERNALCYLINDRICAL CENTRELESS GRINDING
MACHINES -TESTING OF THE ACCURACY
( First Revision )
1 Scope IS0 1101 : 1983, Technical drawbgs - Geometrica/ toleranc-ing - Tolerancing of form, orientation, tocation and run-out -
This international Standard describes, with reference toIS0 230-1, both geometrical and practical tests on generalpurpose and normal accuracy external cylindrical centrelessgrinding machines and gives the corresponding permissibledeviations which apply.
Generalities, definidons, symbols, indications on drawings.
3 Preliminary remarks
It deals only with the verification of accuracy of the machine. Itdoes not apply to the testing of the running of the machine(vibrations, abnormal ‘noises,-stick-slip motion of componentsetc.), or to its characteristics (speeds, feeds etc.) which shouldgenerally be checked before the accuracy is tested.
3.1 In this International Standard, all the dimensions and per-missible deviations are expressed in millimetres and in inches.
3.2 To apply this International Standard, reference should bemade to ISO 230-l especially for the installation of the machinebefore testing, the warming up of spindles and other movingparts, the description of measuring methods and the recom-mended accuracy of testing equipment.
This International Standard also gives the nomenclature usedfor the principal parts of the machine.
NOTE - In addition to terms used in the three official IS0 languages(English, French and Russian), this International Standard gives theequivalent terms in the German language; these are published underthe responsibility of the member body for Germany, F.R. (DIN).However, only the terms given in the official languages can be con-sidered as IS0 terms.
3.3 The sequence in which the geometrical tests are given isrelated to the sub-assemblies of the machine, and this in noway defines the practical order of testing. In order to make themounting of instruments or gauging easier, tests may be ap-plied in any order.
2 Normative references
The following standards contain provisions which, throughreference in this text, constitute provisions of this InternationalStandard. At the time of publication, the editions indicatedwere valid. All standards are subject to revision, and parties toagreements based on this International Standard are encouragedto investigate the possibility of ap $$ng the most recenteditions of the standards indicated below. Members of IEC andIS0 maintain registers of currently valid International Stan-dards.
ISO 230-l : 1986, Acceptance code for machine tools -Part 1: Geometric accuracy of machines operating under no-load or finishing conditions.
3.4 When~inspecting-a machine, it is not always necessarytocarry out all the tests described in thii International Standard. Itis up to the user to choose, in agreement with the manufac-turer, those relating to the properties which are of interest, butthese tests are to be clearly stated when ordering a machine.
3.5 Practical tests shall be made with finishing cuts and notwith roughing cuts which are liable to generate appreciablecutting forces.
3.6 When the tolerance is established for a measuring rangediiarent from that given in this International Standard JseeIS0 230-l : l!BS, 2.311) it should be taken into considerationthat the minimum value of tolerance is O,OlX! mm (O,ooO OS in).
1
IS 12295 : 2000IS0 3875 : 1990
4 NomenclatCIre
See figure 1 and table 1.
2
Table 1
Zeterencs Designation
1 Bed
2 Saddle. slide
3 Saddle guideway
4 Grinding spindle head
5
6
7
8
9
10
11
12
13
14
15
16
17
Grinding wheel
Regulating wheel spindlehead
Regulating wheel
Work rest
Work rest support
Wheel guard
Coolant pipe
lnfeed handwheel
Adjusting lever
Control panel
Dressing attachment forgrinding wheel
Dressing attachment iOr
regulating wheel
Angular housing - Bearinganal0
IS 12295 : 2009IS0 3875 : 1999
3
IS 12295 : 2000IS0 3875 : 1990
5 Acceptance conditions and permissible deviations
5.1 Geometrical tests
No. Diagram Object
GO!I~~~\!
Levelling of the machine.
c
A - Grinding wheel dresser
Checking of movement of the dressing tool for
a) straightness of movement in the plane ofaction;
01
b) parallelism of movement to the grindingspindle axis in a plane perpendicular to theplane ~of action;
c) parallelism of movement to the grindingspindle axis in the plane of action.
NOTE - Test cl applies only for machines withfixed dresser and non-adjustable template.
-
-
4
IS 12295 : 2000IS0 3875 : 1990
Permissible deviation
mm
0,1/l ooo
0.003
for any measuring length of
0,05
for any measuring length of
300
0.W
for any measuring length of
300
Measuringinstruments
Precisionlevels
Dial gauge,test mandreland masterstraightedge
Observations and references to theIS0 230-l : 1986 acceptance code
Subclause 3.1
This test should be carried out only wheninstructions on levelling have not been pro-vided by the manufacturer.
Subclauses 5.231, 5.333 and 5422.3
The dial gauges shall be mounted on thedressing tool holder with their styli con-tacting the test~mandrel, which is insertedin the grinding wheel spindle, in the planeof action -and in a plane perpendicular tothe plane of action.
The dressing slide shall be moved with anormal working feed. The measuringdistance shall be equal to the maximumwidth of the grinding wheel.
If the machine isprovided with a copyingmechanism, the copying pin should beengaged with a normal working pressure(stated by the manufacturer) against themaster straightedge.
Indicated permissible deviations relate tothe position of the diamond point.
The measuring method gives the sum oferrors from the dressing mechanism.
5
IS 12295 : 2000IS0 3875 : 1990
62
Diagram
Alternetive type of machine
Object
8 - Regulating wheel dresser
Checking of movement of the dressing tool fol
a) straightness of movement in the plane 01action;
b) parallelism of movement relative to tkTegulating spindle axis in the plane 01action;
NOTE - Test bl refers only to machines with fixecdresser and non-adjustable template.
cl parallelism of movement relative to thework support plane.
NOTE - Test c) refers only to machines with a nongradient slide in the vertical plane.
Observations and references to theIS0 230-l : 1996 acceptance code
Subclauses 5.231, 5.233 and 5422.3
The dial gauges shall be mounted on thedressing tool holder with their styli con-tacting the test mandrel or straightedge.
The dressing slide shall be moved with anormal working feed. The measuringdistance shall be equal to the maximumwidth of the regulating wheel.
If the machine is provided with a copyingmechanism, the copying pin shall beengaged with a normal working pressureagainst the master straightedge.
Indicated permissible deviations relate tothe position of the diamond point.
The measuring method gives the sum oferrors from the dressing mechanism.
7
IS 12295 : 2000IS0 3875 : 1990
-
Duo.-
03
8
Diagram
Alternative type of machine
Object
C - Wlork rest blade location
a) Checking of parallelism of the worksupport plane to the grinding spindle axisin the vertical plane.
bj Checking of paralleliim of the verticaldatum face to the regulating spindle axisor the grinding spindle axis in the hori-zontal plane.
NOTE - Test b) applies only for machines withfixed work rest blade, fixed dresser and non-adjustable Iemplate.
-
Permissible deviation
mm
al
b)
0.05
for any measuring length of
300
0.W
for any measuring length of
300
Measuringinstruments
Diil gaugeand test mandrel
IS 12295 : 2oooIS0 3575 : 1990
Observations and references to theIS0 230-l : 19B6 acceptance code
Subclauses 5.412.1 and 5.412.4
The dial gauge shall be mounted on thework rest blade location surfaces with thestylus contacting the test mandrel.
IS 12295 : 2000IS0 3875 : 1990
INo. Diagram Object
a)
D - Regulating spindle
Measurement of run-out of the wheelmounting diameter.
04
b) Measurement of periodic axial slip of thespindle.
b)
Cl Meyuiement of run-out of the spindlebearings.
NOTE - Test cl is to be carried out where appli-cable.
1
10
IS 12295 : 2oooIS0 3875 : 1990
Permissible deviation
mm
0.01
Measuringinstruments
Diil gaugeand measuringballs
Observations and references to theI80 230-l : 1988 acceptance code
a) Subclauses 5.612.1 and 5.612.2
In addition to the specifications given in theIS0 230-l acceptance code, .checking shallbe carried out at both ends of the conical orcylindrical regulating wheel mounting sur-face.
The dial gauge shall be set normal to thesurface which is to be checked.
When measuring the conical surface nocorrection in reading of the dial gauge shallbe carried out.
b) Subclauses 5.621.2 and 5.622
The force F shall be determined by themachine manufacturer. The force shall beapplied in that direction which correspondsto the normal working condition of thespindle.
cl Subclauses 5.612.1 and 5.612.2
This check shall be carried out on measur-ing balls located in the centre on the freeends of the spindle.
11
-IS 12295 : 2oooIS0 3875 : 1990
MO. Diagram Object
E - Grinding spindle
-al Measurement of run-out of the wheelmounting diameter.
NOTE - Test al does not apply to machines withautomatic wheel balancing.
b) Measurement of periodic axial slip of thespindle.
c) Measurement of run-out of the spindlebearings.
NOTE - Test cl is to be carried out where appli-cable.
-F - Feeding device
IMeasurement of accuracy of repetition of thefinishing approach of +he wheel positioning.
NOTE - This test applies only for machines equip-ped for infeed grinding operations.
IS 12295:2000IS0 3875:1990
Permissible deviation
mm
0,005
0,005
0,002
Measuringinstruments
Dial gaugeand measuringbalk
Dial gauge
Observations and references to theI80 PO-1 : 1988 acceptance code
I) Subclauses 5.612.1 and 5.612.2
n addition to the specifications given in theSO 230-l acceptance code, checking shall,e~carried out at both ends of the conical or:ylindrical grinding wheel mounting sur-‘ace.
The dial gauge shall be set normal to thesurface which is to be checked.
Nhen measuring the conical surface, no:orrection in reading of the dial gauge shall38 carried out.
31 Subclauses 5.621.2 and 5.622
The force F shall be determined by themachine manufacturer. The force shall beapplied in that direction which correspondsto the normal working conditions of thespindle.
cl Subclauses 5.612.1 and 5.612.2
This check shall be carried out on measur-ing balls located in the centre on the freeends of the spindle.
Subclause 3.22
Six consecutive tests of the wheel position-ing shall be carried out, the movementbeing obtained by a quick approach fol-lowed by a slow approach.
13
IS 12295 : 2000IS0 3875 : 1990
5.2 Practical test
No.
Pl
Diagram and sizes of test pieces
L
Dimensions in millimetres
nI
Dimensions in inches
11
Material : steel.
Nature of test
lnfeed grinding of acylindrical test piece.
Checks to be applied
a) Consistency of diameter
b) Circularity
he IS0 1101 : lS3,14.3)
I S 1 2 2 9 5 : 2 0 0 0IS0 3875 : 1 9 9 0
Permissible deviation-
mm
0,002for B < 100
0.00
for 100 < B < 2 0 0
0.004
for 200 < B < 300
0,005
for B > 300
0.002
Measuringinstruments
Suitableprecisionmeasuringinstruments
Observations and references to theIS0 239-l : 1986 acceptance code
Subclauses 3.22 and 4.1
Machines equipped solely for through feedgrinding shall be checked by a manualfeeding movement of the infeed grinding.
The consistency of diameter shall bechecked for each 25 mm (1 in) length ofthe test piece or at three equispaced pos-itions along the length of the test piece.
The greatest difference shall be noted.
An additional optional test may be carriedout for through feed grinding to the sametolerances and test piece sizes.
Practical test Pl shall be carried out withfinishing cuts under conditions specified bythe manufacturer.
15
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Review of Indian Standards
Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issueof ‘BIS Handbook’ and ‘Standards : Monthly Additions’.
This Indian Standard has been developed from Dot : No. BP/PE 03 ( 0197 ).
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
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