Chucks are heavy! Get assistance when installing or removing the chuck from the lathe. Wear heavy duty leather boots for foot and toe protection, and keep hands and fingers away from all pinch points. Ignoring this warning can lead to a severe crushing injury or finger amputation!

Specifications• OD Clamping ........... 0.59"–8.46" (15–215mm)• ID Clamping ............ 2.95"–9.45" (75–240mm)• Chuck Bore Diameter ................2.16" (55mm)• Chuck Outer Diameter ............9.84" (250mm)• Maximum Speed ...........................2750 RPM*• Mounting Type ......................... D1-5 Camlock• Construction ..................Fine-GrainCast-Iron• ChuckWeight ......................................... 50lbs• ChuckShippingWeight ......................... 51lbs• Country of Origin ................................ Taiwan

* ThemaximumspeedlistedaboveisONLYpossiblewiththechuckjawsandtheworkpieceincompleterotationalsymmetry.Theworkpieceweightmustbewithinthelimitsofthelathe,andtheworkpiecemassmustbeofequaldensitythroughouttopreventcentrifugalimbalanceorradialrunout—evenifatailstockorothersupportisusedforadditionalsupport.

Instruction SheetPHONE: (360) 734-1540 • www.southbendlathe.com

MODEL SB1227 10" 4-JAW INDEPENDENT CHUCK

Copyright © October, 2010 by South Bend Lathe Co. WARNING: No portion of this manual may be reproduced without written approval.

#CR13307 Printed in Taiwan

Figure 1. Features.

IntroductionTheModelSB1227usesadirectmountD1-5camlocksystemwherethecamlockstudsaredirectlythreadedintotothechuckbodyinsteadof being threaded into a backing plate that isboltedtothechuck.Withoutusingabackplatetomountthechuck,thechuckjawsarepositionedclosertotheheadstockwhichgivesalongerdistancebetweenthejawsandthetailstock.Anotherbenefitisthatthedistancebetweenthejawsandtheoutboardspindlenoseisreduced,soifaspidersupportisusedontheoutboardspindle,shortgunbarrelsandothershorterworkpiecescanbeheldatbothends.

Manufactured with high-tech German CNC

machinery

Fine-grain cast iron body

Hardened steel jaws for durability and extreme clamping force and grip

Independent jaw screws for each

reversible jaw

Direct camlock spindle mounting

Jaw screw retaining pin with lock screws

Safety• Chuck Key Safety:Achuckkeyleftinthe

chuckcanbecomeadangerousprojectilewhenthespindleisstarted.Alwaysremovethechuckkeyafterusingit.Developahabitof not taking your hand off of a chuck key unlessitisawayfromthemachine.

• Disconnect Power: Disconnectthelathefrompowerbeforeinstallingandremovingthe chuck or doing any maintenance or adjustments.Accidentallathestartupcancausesevereinjuryordeath.

• Secure Clamping: Athrownworkpiecemaycausesevereinjuryorevendeath.Whenswappingthechuckjawpositions,keep in mind that maximum gripping forceisattainedatfulljawandjawscrewengagement. Ifonlyoneispartiallyengaged,overallclampingforceisreduced.

• Speed Rates: Operating the lathe where maximumchuckspeedisexceeded,orattoohighofaspeedforanunbalancedworkpiece,cancausetheworkpiecetobethrownfromthechuck.Alwaysusetheappropriatefeedandspeedrates.Athrownworkpiecemaycausesevereinjuryorevendeath.

• Large Chucks: Largechucksareveryheavyanddifficulttograsp,whichcanleadtocrushedfingersorhandsifmishandled.Getassistancewheninstallingorremovinglargechuckstoreducethisrisk.Protectyourhandsandtheprecisiongroundwaysbyusingachuckcradleorpieceofplywoodoverthewaysofthelathewhenservicingchucks.

• Safe Clearances: Oftenchuckjawswillprotrudepastthediameterofthechuckandcancontactacoolantnozzle,tooling,toolpost,orsaddle.Beforestartingthespindle,makesuretheworkpieceandchuckjawshaveadequateclearancebyrotatingthenbyhandthroughitsentirerangeofmotionbyhand.

• Stopping Lathe By Hand: Stopping the spindlebyputtingyourhandontheworkpieceorchuckcreatesanextremeriskofentanglement,impact,crushing,friction,orcuttinghazards.Neverattempttosloworstopthelathechuckbyusingyourhand.Allowthespindletocometoastoponitsownorusethebrake(ifequipped).

• Long Stock Safety: Longstockcanwhipviolentlyifnotproperlysupported,causingseriousimpactinjuryanddamagetothelathe.Reducethisriskbysupportinganystockthatextendsfromthechuck/headstockmorethanthreetimesitsowndiameter.Alwaysturnlongstockatslowspeeds.

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Camlock Stud InstallationThecamlockstudsthatareshippedwiththischuckmaybepre-installedfromthefactory.IfsoskipthissectionandcompleteChuck Installation and Removal on Page 4; otherwise,installthecamlockstudsasoutlinedbelow:

1. Oilandthreadeachcamstudintothechuckuntilthealignmentgrooveisflushwiththechucksurface,asshowninFigure 2.

2. Installandtightenthelockingcapscrewforeachstud,makingsurethatthecamlockstudscanslightlyrotatebackandforth.

Figure 2. Camlock stud installation.

Figure 3. Camlock stud adjustment.

Camlock Stud AdjustmentIfthecamlockstudshavebeenpre-installedatthefactory,orifyouareinstallingthemforthefirsttime,slightmachiningdifferencesbetweenthelathespindleandchuckcancauseoneormorecamlockstolockattheincorrectlocation.

If any cam line stopsoutsideofa “V” mark when allofthecamlockshavebeentightened, removethechuckandadjusttheheightoftheoffendingstud one full turn up or down asillustratedbelow.Afterallcamlocksoperatecorrectly,stampalignmentmarksinthechuckandspindletoensurethatthechuckcanbere-installedinthesamepositionafterbeingremoved.

Camlock Stud Must Slightly Rotate Back/Forth

Cap ScrewInstalled & Tight

Initial Adjustment: Camlock Stud Alignment Groove is Flush with Chuck Surface

Alignment Marks

Spindle LineCORRECT

The Camlock Mark Stops Between the

“V” Marks.

To Correct:Turn Stud One Turn In

To Correct:Turn Stud One Turn Out

INCORRECTThe Camlock Mark Stops Before the

“V” Marks.

INCORRECTThe Camlock Mark Stops After the

“V” Marks.

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6. Withthehelpofanotherperson,orwiththehelpofachuckcradle,alignthechuckwiththespindlesothestudsandcamlockboresarealignedcorrectly,andcarefullyslidethechuckontothelathespindle.Neverrestthechuckonitslowerstuds,asshowninFigure 5,androllorpushthetopofthechuckintoplaceonthespindle.Thisisabadpracticethatmaydamagethestudsandcamlockbores.

Do not install the chuck without having the camlock cap screws in place or fully tightened. Otherwise, the camlock studs may turn with the camlocks on release, resulting in the chuck being permanently locked onto the spindle.

Figure 5. Typical alignment of studs and camlock bores.

3. Cleanawaydebrisandoilysubstancesfromthematingsurfacesofthespindleandthechucktoensurethebestfitpossible.

4. Inspectandmakesurethatallcamlockstudsareundamaged,clean,andlightlyoiled.

5. Makesurethatthecamlockstudretainingcapscrewsaresnug,butstillallowthestudstoberotatedbackandforthslightlybyhand.Thisfree-playiscriticaltoensurethatthecamlockstightenandlockwiththestudscompletely,andwillreleasewithoutbinding.

—Ifaproblemisfoundwiththecamlocklockingorrelease,removetheoffendingstudandcleanitwithmineralspirits.Compareitwithagoodstudforanyinconsistencies,andreplaceitifaproblemisfound.Inspectthebore,capscrew,seatdepth,andthreadswithothersthatareknowntobecorrect.Chaseallthreads,andremoveanyburrsordingsintheseat.Dryouttheborewithcompressedairandlightly re-lubricate with a drop or two of machine oil or way oil.

Figure 4. Wooden chuck support cradle.

Before turning the lathe ON, make sure the chuck key is removed! A thrown chuck key can cause serious injury or death to the operator or bystanders.

1. DISCONNECTLATHEFROMPOWER!

2. Layachuckcradle(seeFigure 4) or plywoodunderthechuckandoverthebedwaytoprotecttheprecisiongroundsurfacesfromdamageandreducetheriskoffingersgettingpinched.

Chuck Installation and Removal

INCORRECTCORRECT

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7. Tightencamlocksinastarpatterntodrawthechuckinevenlyandreducethechanceofmisalignment.Makesuretotightencamlocksinanincrementalmannertoensurethatonecamlockdoesnotgetfullytightenedbeforetheothers(i.e.,snugthecamlocksonthefirstpass,thenmoderatelytightenonthenextpass,thenfullytightenonthethirdpass).

Asyoutightenthecamlocks,thechuckwillseatwiththespindlenose.Whenfullytightened,thecamlinewillfallbetweenthetwo"V"marksonthespindlenose,asshownin Figure 6.

Figure 6. Camlock is fully tightened with the camlock line positioned between the "V" marks.

— Ifthecamisfullytightened,butthecamline ispositionedoutsideofthe“V”marks,removethechuckandadjusttheheightofthe offending camlock stud,asoutlinedinCamlock Stud Adjustment on Page 3.

8. Wheninstallationiscompleteandyouaresatisfiedwiththeresults,lightlystampasetofalignmentmarksonthechuckandspindle.

Note: Alignmentmarksensurethatthechuckcanbere-installedinthecorrectpositioneverytimeforconsistentchuckandspindlealignment.Italsoallowsforthesamecamlocksandstudstooperatetogetherforconsistentlockingandunlocking.

Cam line is between the "V" marks

PINCH HAZARD! Protect your hands and the precision ground bedways with plywood or a chuck cradle when removing the lathe chuck! The heavy weight of a falling chuck can cause serious injury.

To remove the chuck:1. DISCONNECTLATHEFROMPOWER!

2. Layachuckcradleorplywoodunderthechuckandoverthebedwaytoprotecttheprecisiongroundsurfacesfromdamageandreducetheriskoffingersgettingpinched.

3. Loosenthecamlocksbyturningthekeycounterclockwiseapproximatelyone-thirdofaturnuntilthemarkonthecamlockalignswiththespindlemarkonthespindlenose(seeFigure 7).Ifthestuddoesnotfreelyreleasefromthecamlock,wigglethecamlockuntilitstudreleases.

Note:Camlockscanbecomeverytight.Acheaterpipemaybeusedtoaddleveragewhenloosening.

Figure 7. Camlock is fully loosened when the camlock line is aligned with the spindle mark.

Cam line isaligned with the

spindle mark

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CAUTION: During the next step, the chuck may come off suddenly, so it is important that you are ready to support its weight with a chuck cradle to prevent crushing your fingers or dropping the chuck.

4. Usingadeadblowhammerorothersoftmallet,lightlytaparoundtheoutercircumference of the chuck body to break the chuckfreefromthecamlocksandthespindlenosetaper.

5. Usearockingmotiontocarefullyremovethechuckfromthespindle.

—Ifthechuckdoesnotimmediatelycomeoff,rotatethechuckapproximately60˚andtapagain.Makesureallthemarksonthecamsandspindleareinproperalignmentforremoval.

OperationNon-cylindricalpartscanbeheldandbroughtintothespindlecenterlineforfacingorboringTheotherbenefitisthatthemajorityofworkpiecescanbepositionedoutofthespindlerotationaxisifabore(seeFigure 9)orastepneedstobecutintoaworkpieceonanoutlyingedge.Forthebestgrippossibleonodd-shapedworkpieces,oneormorejawscanalsoberotated180°tograbmoresurfaceareaforclamping.Ifallfourjawscannotbeusedtoholdtheworkpiece,youmustusefaceplatetoreducetheriskofaworkpiecebeingthrown.

To clamp a workpiece in the chuck:1. DISCONNECTLATHEFROMPOWER!

2. Installacenterinthetailstock.

3. Retracteachjawand place the workpiece flatagainstthechuckface.

4. Slidethetailstockforward,sothetipofthedeadcenterappliesenoughpressureagainsttheworkpiecetoholditinplace,andthenlockthetailstockinposition.

5. Moveeachjawuntilitmakeslightcontactwith the workpiece.

Figure 8. Tightening sequence.

7. Aftertheworkpieceisheldinplacebythejaws,turnthechuckbyhandandpayattention to the workpiece alignment.

—Iftheworkpieceisnotcorrectlyalignedforyouroperation,turnthechuckandmakefineadjustmentsbyslightlylooseningonejawandtighteningtheopposingjawuntiltheworkpieceiscorrectlyaligned(seeFigure 9 for an example).

1

2

3

4

Hole to be bored into workpiece

Figure 9. Non-concentric workpiece correctly clamped in the 4-jaw chuck.

6. FollowingthesequenceshowninFigure 8,tighteneachjawinsmallincrementstomovetheworkpieceintotherequiredposition.Checkfrequentlytomakesuretheintendedcenterpointoftheworkpiecehasnotwanderedawayfromthespindlecenterlinewhilethejawsarebeingtightened.

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Jaw screw retaining pinSet screw

a

Figure 10. Chuck sequence of disassembly.

Care & Maintenance

Always disconnect machine from power before performing maintenance or serious personal injury may result.

!

b. Backthejawsoutofthechuck

c. Removethefoursetscrews.

d. Putonsafetyglasses,anduseahammer anddriftpunchtotapouteachjawscrew retaining pin.

e. Slidethejawscrewsoutoftheirbores.

4. Usingmineralspirits,cleananddryallparts.Inspectandfixallbores,teeth,pins,andmatingsurfacesforwear,burrs,galling,rust,orcracks.

5. Withoutchangingthedimensionofanypart,useawirebrush,emerycloth,ordressingstonestoremoveallrust,burrs,oranyhighspotscausedbygalling.

6. CoatallpartswithanyautomotiveNLGI#2grease,andcarefullyre-assemblethechuckinthereverseordershowninFigure 10.

7. Rotatethechuckkeyclockwiseuntiltheleadthreadofeachjawscrewisseenjustenteringthejawguide,theninserteachnumberedjawintoitsnumberedslot.

8. Oneatatime,holdeachjawagainstitsjawscrew,androtatethechuckkeyclockwisetoengagethejawscrewwiththejaw,thenfullythreadthejawintothechuck.

9. Alignandre-installthechuck.

Foroptimumperformancefromyourchuck,followthemaintenanceschedulebelow.Neverhammeronthechuck,jaws,oraworkpiecethatisclampedinthechuck;andneversubjectthechucktoabrasives,flame,orwater.

Daily:• Check/correctloosemountingbolts.• Keep the chuck clean and oiled.• Useavacuum,rag,orbrushtocleanthe

chuckafteruse. Neveruseairpressuretocleanchipsawayfromachuck.

• Avoidleavingthechuckclampedonaworkpiece,unloadthechuckjawsdaily.

• Makesurethechuckkeyisremovedfromthechuckwhennotinuse.

Ifthechuckeverbecomesstifftooperate,itmayhavebeencontaminatedwithmetalchipsorabrasivesfromincorrectorinfrequentmaintenanceintervals.Ifthisisthecase,thechuckmustbedisassembled,cleaned,andre-lubricated.

To disassemble the chuck for a full cleaning and lubrication service:1. DISCONNECTLATHEFROMPOWER!

2. Verifythatchuckalignmentmarksarepresentsothechuckcanbere-installedinthesameposition,andremovethechuck.Stampthemarksiftheydonotexist.

3. Leavingthecamlockstudsinplace,disassemblethechuckinthesequencelistedbelowandshowninFigure 10.

a. Placeasetofwoodenblocksunderthe chucksothecamlockstudsdonotreston thetable,andclampthechucktothe tableasshowninFigure 10.

b

c

de

d

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TroubleshootingSymptom Possible Cause Possible Solution

Thechuckhashardspotsorbindscompletely.

1. Jawisinapoorpositionforclamping.

1. Re-installjawsformaximumengagementwithjawslotandjawscrew.

2. Lackoflubrication,rust,burr,ormetalshavingsinsideofchuck.

2. Disassemble,de-burr,clean,andlubricatechuck.

3. Brokentoothonthejaworthejawscrew.

3. Disassemblechuckandrepair/replacebrokenpart.

Theworkpieceslipsinthejaws.

1. Incorrectjaworworkpiececlampingposition.

1. Re-installjawsformaximumengagementwithjawslotandjawscrew.

2. Chuckisbindingbeforefullclampingforceisachieved,orajaworjawscrewisbinding.

2. Chuckisloadedupwithcontaminants.Disassembleandservicechuck.Loosenandretightenthechuckkeyseveraltimestodistributelubricant.

3. Cuttingoverload. 3. Reduce cutting depth or feed rate.

Clamping accuracy ispoor.

1. Workpieceimproperlyclampedorworkpieceismisaligned.

1. Removejaws,clean,de-burr,andre-install;verifyaccuracyandrecalibratetest/dialindicator.

2. Chuckloose;mountingisoff-center,orisimproperlyseated.

2. Removechuck,cleanandde-burrmounting;adjustcamlockstuds,andre-installchuck.

Parts List

Please Note: We included this parts breakdown for service purposes only. Since many of the parts shown are machined to each individual chuck, they may not be available as replacement items.

Parts DiagramREF PART # DESCRIPTION1 PSB1227001 REVERSIBLE CHUCK JAW2 PSB1227002 CHUCK BODY3 PSB1227003 JAW SCREW4 PSB1227004 JAW SCREW PIN5 PSS02 SET SCREW 5/16-18 X 3/86 PSB1227006 CHUCK KEY7 PSB1227007 D1-5 CAMLOCK STUD8 PCAP04 CAP SCREW 1/4-20 X 1/2

63

2

1

5

87

4

If you need help with your new chuck, contact us at: PHONE: (360) 734-1540 FAX: (360) 676-1075 (International)FAX: (360) 734-1639 (USA Only)EMAIL: sales@southbendlathe.com

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