Southbend SB1231 User manual

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...... 0.69"–10.04" (17.5–255mm)

•ID Clamping.......... 3.74"–10.83" (95–275mm)

•Chuck Bore Diameter ................2.56" (65mm)

•Chuck Outer Diameter ..........11.81" (300mm)

•Maximum Speed ...........................2500 RPM*

•Mounting Type ......................... D1-8 Camlock

• Construction..................Fine-GrainCast-Iron

• ChuckWeight......................................... 80lbs

• ChuckShippingWeight......................... 85lbs

•Country of Origin ................................ Taiwan

* ThemaximumspeedlistedaboveisONLY

possiblewiththechuckjawsandthe

workpieceincompleterotationalsymmetry.

Theworkpieceweightmustbewithinthe

limitsofthelathe,andtheworkpiecemass

mustbeofequaldensitythroughoutto

preventcentrifugalimbalanceorradial

runout—evenifatailstockorothersupport

isusedforadditionalsupport.

Instruction Sheet

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

MODEL SB1231

12" 4-JAW INDEPENDENT CHUCK

WARNING: No portion of this manual may be reproduced without written approval.

#CR13310 Printed in Taiwan

Figure 1. Features.

Introduction

TheModelSB1231usesadirectmountD1-8

camlocksystemwherethecamlockstudsare

directlythreadedintotothechuckbodyinstead

of being threaded into a backing plate that

isboltedtothechuck.Withoutusingaback

platetomountthechuck,thechuckjawsare

positionedclosertotheheadstockwhichgives

alongerdistancebetweenthejawsandthe

tailstock.Anotherbenefitisthatthedistance

betweenthejawsandtheoutboardspindlenose

isreduced,soifaspidersupportisusedonthe

outboardspindle,shortgunbarrelsandother

shorterworkpiecescanbeheldatbothends.

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:Achuckkeyleftinthe

chuckcanbecomeadangerousprojectile

whenthespindleisstarted.Alwaysremove

thechuckkeyafterusingit.Developahabit

of not taking your hand off of a chuck key

unlessitisawayfromthemachine.

•Disconnect Power: Disconnectthelathe

frompowerbeforeinstallingandremoving

the chuck or doing any maintenance or

adjustments.Accidentallathestartupcan

causesevereinjuryordeath.

•Secure Clamping: Athrownworkpiece

maycausesevereinjuryorevendeath.

Whenswappingthechuckjawpositions,

keep in mind that maximum gripping

forceisattainedatfulljawandjawscrew

engagement. Ifonlyoneispartiallyengaged,

overallclampingforceisreduced.

•Speed Rates: Operating the lathe where

maximumchuckspeedisexceeded,orattoo

highofaspeedforanunbalancedworkpiece,

cancausetheworkpiecetobethrownfrom

thechuck.Alwaysusetheappropriatefeed

andspeedrates.Athrownworkpiecemay

causesevereinjuryorevendeath.

•Large Chucks: Largechucksareveryheavy

anddifficulttograsp,whichcanleadto

crushedfingersorhandsifmishandled.

Getassistancewheninstallingorremoving

largechuckstoreducethisrisk.Protectyour

handsandtheprecisiongroundwaysby

usingachuckcradleorpieceofplywoodover

thewaysofthelathewhenservicingchucks.

•Safe Clearances: Oftenchuckjawswill

protrudepastthediameterofthechuckand

cancontactacoolantnozzle,tooling,tool

post,orsaddle.Beforestartingthespindle,

makesuretheworkpieceandchuckjaws

haveadequateclearancebyrotatingthenby

handthroughitsentirerangeofmotionby

hand.

•Stopping Lathe By Hand: Stopping the

spindlebyputtingyourhandonthe

workpieceorchuckcreatesanextremerisk

ofentanglement,impact,crushing,friction,

orcuttinghazards.Neverattempttoslow

orstopthelathechuckbyusingyourhand.

Allowthespindletocometoastoponits

ownorusethebrake(ifequipped).

•Long Stock Safety: Longstockcanwhip

violentlyifnotproperlysupported,causing

seriousimpactinjuryanddamagetothe

lathe.Reducethisriskbysupportingany

stockthatextendsfromthechuck/headstock

morethanthreetimesitsowndiameter.

Alwaysturnlongstockatslowspeeds.

-2-

Mfg.Since5/10

Model SB1231 INSTRUCTIONS

Camlock Stud Installation

Thecamlockstudsthatareshippedwiththis

chuckmaybepre-installedfromthefactory.

IfsoskipthissectionandcompleteChuck

Installation and Removal on Page 4;

otherwise,installthecamlockstudsasoutlined

below:

1. Oilandthreadeachcamstudintothechuck

untilthealignmentgrooveisushwiththe

chucksurface,asshowninFigure 2.

2. Installandtightenthelockingcapscrew

foreachstud,makingsurethatthecamlock

studscanslightlyrotatebackandforth.

Figure 2. Camlock stud installation.

Figure 3. Camlock stud adjustment.

Camlock Stud Adjustment

Ifthecamlockstudshavebeenpre-installedat

thefactory,orifyouareinstallingthemforthe

rsttime,slightmachiningdifferencesbetween

thelathespindleandchuckcancauseoneor

morecamlockstolockattheincorrectlocation.

If any cam line stopsoutsideofa “V” mark when

allofthecamlockshavebeentightened, remove

thechuckandadjusttheheightoftheoffending

stud one full turn up or down asillustrated

below.Afterallcamlocksoperatecorrectly,

stampalignmentmarksinthechuckandspindle

toensurethatthechuckcanbere-installedin

thesamepositionafterbeingremoved.

Camlock Stud

Must Slightly

Rotate Back/Forth

Cap Screw

Installed & Tight

Initial Adjustment:

Camlock Stud Alignment

Groove is Flush with Chuck

Surface

Alignment Marks

Spindle Line

CORRECT

The Camlock Mark

Stops Between the

“V” Marks.

To Correct:

Turn Stud One Turn In

To Correct:

Turn Stud One Turn Out

INCORRECT

The Camlock Mark

Stops Before the

“V” Marks.

INCORRECT

The Camlock Mark

Stops After the

“V” Marks.

Mfg.Since5/10 Model SB1231

-3-

INSTRUCTIONS

6. Withthehelpofanotherperson,orwiththe

helpofachuckcradle,alignthechuckwith

thespindlesothestudsandcamlockbores

arealignedcorrectly,andcarefullyslidethe

chuckontothelathespindle.Neverrestthe

chuckonitslowerstuds,asshowninFigure

5,androllorpushthetopofthechuckinto

placeonthespindle.Thisisabadpractice

thatmaydamagethestudsandcamlock

bores.

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. Cleanawaydebrisandoilysubstancesfrom

thematingsurfacesofthespindleandthe

chucktoensurethebestfitpossible.

4. Inspectandmakesurethatallcamlock

studsareundamaged,clean,andlightly

oiled.

5. Makesurethatthecamlockstudretaining

capscrewsaresnug,butstillallowthestuds

toberotatedbackandforthslightlybyhand.

Thisfree-playiscriticaltoensurethatthe

camlockstightenandlockwiththestuds

completely,andwillreleasewithoutbinding.

—Ifaproblemisfoundwiththecamlock

lockingorrelease,removetheoffending

studandcleanitwithmineralspirits.

Compareitwithagoodstudforany

inconsistencies,andreplaceitifaproblem

isfound.Inspectthebore,capscrew,seat

depth,andthreadswithothersthatare

knowntobecorrect.Chaseallthreads,

andremoveanyburrsordingsintheseat.

Dryouttheborewithcompressedairand

lightly 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. DISCONNECTLATHEFROMPOWER!

2. Layachuckcradle(seeFigure 4) or

plywoodunderthechuckandoverthe

bedwaytoprotecttheprecisionground

surfacesfromdamageandreducetheriskof

fingersgettingpinched.

Chuck Installation and Removal

INCORRECTCORRECT

-4-

Mfg.Since5/10

Model SB1231 INSTRUCTIONS

7.  Tightencamlocksinastarpatterntodraw

thechuckinevenlyandreducethechance

ofmisalignment.Makesuretotighten

camlocksinanincrementalmannerto

ensurethatonecamlockdoesnotgetfully

tightenedbeforetheothers(i.e.,snugthe

camlocksonthefirstpass,thenmoderately

tightenonthenextpass,thenfullytighten

onthethirdpass).

 Asyoutightenthecamlocks,thechuck

willseatwiththespindlenose.Whenfully

tightened,thecamlinewillfallbetweenthe

two"V"marksonthespindlenose,asshown

in Figure 6.

Figure 6. Camlock is fully tightened with the camlock

line positioned between the "V" marks.

— Ifthecamisfullytightened,butthecam

line ispositionedoutsideofthe“V”marks,

removethechuckandadjusttheheightof

the offending camlock stud,asoutlinedin

Camlock Stud Adjustment on Page 3.

8. Wheninstallationiscompleteandyouare

satisedwiththeresults,lightlystampaset

ofalignmentmarksonthechuckandspindle.

Note: Alignmentmarksensurethatthe

chuckcanbere-installedinthecorrect

positioneverytimeforconsistentchuckand

spindlealignment.Italsoallowsforthesame

camlocksandstudstooperatetogetherfor

consistentlockingandunlocking.

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. DISCONNECTLATHEFROMPOWER!

2. Layachuckcradleorplywoodunderthe

chuckandoverthebedwaytoprotectthe

precisiongroundsurfacesfromdamageand

reducetheriskoffingersgettingpinched.

3. Loosenthecamlocksbyturningthekey

counterclockwiseapproximatelyone-thirdof

aturnuntilthemarkonthecamlockaligns

withthespindlemarkonthespindlenose

(seeFigure 7).Ifthestuddoesnotfreely

releasefromthecamlock,wigglethecamlock

untilitstudreleases.

Note:Camlockscanbecomeverytight.Acheater

pipemaybeusedtoaddleveragewhen

loosening.

Figure 7. Camlock is fully loosened when the camlock

line is aligned with the spindle mark.

Cam line is

aligned with the

spindle mark

Mfg.Since5/10 Model SB1231

-5-

INSTRUCTIONS

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. Usingadeadblowhammerorother

softmallet,lightlytaparoundtheouter

circumference of the chuck body to break the

chuckfreefromthecamlocksandthespindle

nosetaper.

5. Usearockingmotiontocarefullyremovethe

chuckfromthespindle.

—Ifthechuckdoesnotimmediatelycome

off,rotatethechuckapproximately60˚

andtapagain.Makesureallthemarks

onthecamsandspindleareinproper

alignmentforremoval.

Operation

Non-cylindricalpartscanbeheldandbrought

intothespindlecenterlineforfacingorboring

Theotherbenetisthatthemajorityof

workpiecescanbepositionedoutofthespindle

rotationaxisifabore(seeFigure 9)orastep

needstobecutintoaworkpieceonanoutlying

edge.Forthebestgrippossibleonodd-shaped

workpieces,oneormorejawscanalsoberotated

180°tograbmoresurfaceareaforclamping.

Ifallfourjawscannotbeusedtoholdthe

workpiece,youmustusefaceplatetoreducethe

riskofaworkpiecebeingthrown.

To clamp a workpiece in the chuck:

1. DISCONNECTLATHEFROMPOWER!

2. Installacenterinthetailstock.

3. Retracteachjawand place the workpiece

flatagainstthechuckface.

4. Slidethetailstockforward,sothetipofthe

deadcenterappliesenoughpressureagainst

theworkpiecetoholditinplace,andthen

lockthetailstockinposition.

5. Moveeachjawuntilitmakeslightcontact

with the workpiece.

Figure 8. Tightening sequence.

7.  Aftertheworkpieceisheldinplaceby

thejaws,turnthechuckbyhandandpay

attention to the workpiece alignment.

—Iftheworkpieceisnotcorrectlyaligned

foryouroperation,turnthechuckand

makefineadjustmentsbyslightly

looseningonejawandtighteningthe

opposingjawuntiltheworkpieceis

correctlyaligned(seeFigure 9 for an

example).

Hole to be

bored into

workpiece

Figure 9. Non-concentric workpiece correctly clamped

in the 4-jaw chuck.

6. FollowingthesequenceshowninFigure 8,

tighteneachjawinsmallincrementstomove

theworkpieceintotherequiredposition.

Checkfrequentlytomakesuretheintended

centerpointoftheworkpiecehasnot

wanderedawayfromthespindlecenterline

whilethejawsarebeingtightened.

-6-

Mfg.Since5/10

Model SB1231 INSTRUCTIONS

Jaw screw retaining pin

Set screw

Figure 10. Chuck sequence of disassembly.

Care & Maintenance

Always disconnect

machine from power before

performing maintenance or

serious personal injury may

result.

b. Backthejawsoutofthechuck

c. Removethefoursetscrews.

d. Putonsafetyglasses,anduseahammer

 anddriftpunchtotapouteachjawscrew

retaining pin.

e. Slidethejawscrewsoutoftheirbores.

4. Usingmineralspirits,cleananddryall

parts.Inspectandxallbores,teeth,pins,

andmatingsurfacesforwear,burrs,galling,

rust,orcracks.

5. Withoutchangingthedimensionofanypart,

useawirebrush,emerycloth,ordressing

stonestoremoveallrust,burrs,oranyhigh

spotscausedbygalling.

6. CoatallpartswithanyautomotiveNLGI#2

grease,andcarefullyre-assemblethechuck

inthereverseordershowninFigure 10.

7.  Rotatethechuckkeyclockwiseuntilthe

leadthreadofeachjawscrewisseenjust

enteringthejawguide,theninserteach

numberedjawintoitsnumberedslot.

8. Oneatatime,holdeachjawagainstitsjaw

screw,androtatethechuckkeyclockwiseto

engagethejawscrewwiththejaw,thenfully

threadthejawintothechuck.

9. Alignandre-installthechuck.

Foroptimumperformancefromyourchuck,

followthemaintenanceschedulebelow.Never

hammeronthechuck,jaws,oraworkpiecethat

isclampedinthechuck;andneversubjectthe

chucktoabrasives,ame,orwater.

Daily:

• Check/correctloosemountingbolts.

•Keep the chuck clean and oiled.

•Useavacuum,rag,orbrushtocleanthe

chuckafteruse. Neveruseairpressureto

cleanchipsawayfromachuck.

• Avoidleavingthechuckclampedona

workpiece,unloadthechuckjawsdaily.

• Makesurethechuckkeyisremovedfrom

thechuckwhennotinuse.

Ifthechuckeverbecomesstifftooperate,

itmayhavebeencontaminatedwithmetal

chipsorabrasivesfromincorrectorinfrequent

maintenanceintervals.Ifthisisthecase,the

chuckmustbedisassembled,cleaned,andre-

lubricated.

To disassemble the chuck for a full cleaning

and lubrication service:

1. DISCONNECTLATHEFROMPOWER!

2. Verifythatchuckalignmentmarksare

presentsothechuckcanbere-installedin

thesameposition,andremovethechuck.

Stampthemarksiftheydonotexist.

3. Leavingthecamlockstudsinplace,

disassemblethechuckinthesequencelisted

belowandshowninFigure 10.

a. Placeasetofwoodenblocksunderthe

 chucksothecamlockstudsdonotreston

 thetable,andclampthechucktothe

 tableasshowninFigure 10.

Mfg.Since5/10 Model SB1231

-7-

INSTRUCTIONS

Troubleshooting

Symptom Possible Cause Possible Solution

Thechuckhas

hardspotsorbinds

completely.

1. Jawisinapoorpositionfor

clamping.

1. Re-installjawsformaximumengagementwithjaw

slotandjawscrew.

2. Lackoflubrication,rust,burr,or

metalshavingsinsideofchuck.

2. Disassemble,de-burr,clean,andlubricatechuck.

3. Brokentoothonthejaworthejaw

screw.

3. Disassemblechuckandrepair/replacebrokenpart.

Theworkpieceslips

inthejaws.

1. Incorrectjaworworkpiececlamping

position.

1. Re-installjawsformaximumengagementwithjaw

slotandjawscrew.

2. Chuckisbindingbeforefull

clampingforceisachieved,orajaw

orjawscrewisbinding.

2. Chuckisloadedupwithcontaminants.Disassemble

andservicechuck.Loosenandretightenthechuck

keyseveraltimestodistributelubricant.

3. Cuttingoverload. 3. Reduce cutting depth or feed rate.

Clamping accuracy

ispoor.

1. Workpieceimproperlyclampedor

workpieceismisaligned.

1. Removejaws,clean,de-burr,andre-install;verify

accuracyandrecalibratetest/dialindicator.

2. Chuckloose;mountingisoff-center,

orisimproperlyseated.

2. Removechuck,cleanandde-burrmounting;adjust

camlockstuds,andre-installchuck.

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 Diagram

REF PART # DESCRIPTION

1 PSB1231001 REVERSIBLE CHUCK JAW

2 PSB1231002 CHUCK BODY

3 PSB1231003 JAW SCREW

4 PSB1231004 JAW SCREW PIN

5 PSS02 SET SCREW 5/16-18 X 3/8

6 PSB1231006 CHUCK KEY

7 PSB1231007 D1-8 CAMLOCK STUD

8 PCAP09 CAP SCREW 5/16-18 x 5/8

If you need help with your new chuck,

PHONE: (360) 734-1540

FAX: (360) 676-1075 (International)

FAX: (360) 734-1639 (USA Only)

EMAIL: [email protected]

-8-

Mfg.Since5/10

Model SB1231 INSTRUCTIONS

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