Kitagawa HW-08 User manual

4-JawClosedCenterPowerChuck
・This instructionmanual is for production engineers and
maintenancepersonnelinchargeofoperationofthisproduct.
Whenabeginnerusesthisproduct,receiveinstructionsfrom
experiencedpersonnel,thedistributororourcompany.
・Before installing, operating or maintainingthis equipment,
carefully read this manual and the safety labels attached to
theequipment.Failuretofollowtheseinstructionsandsafety
precautions could result in serious injury, death, or property
damage.
・Storethismanualnearequipmentforfuturereference.
・If any questions related to safetyarise about this manual,
pleaseconfirmthemwiththedistributororourcompany.
INSTRUCTIONMANUAL
HW 
type
Version 1.08 (2019.09.03)
Original instructions
DANGER
77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan
Te l .[phone]
Fax.[phone]
KitagawaCorporation
https://www.kitagawa.com
https://www.kiw.co.jp
■ JAPAN DOMESTIC
■ OVERSEAS
Tokyooffice
Sendaioffice
Nagoyaoffice
Osakaoffice
Hiroshimaoffice
Kyushuoffice
Overseasoffice
TheproductshereinarecontrolledunderJapaneseForeignExchangeandForeignTradeControlAct.Intheeventofimportingand/orexportingtheproducts,
youareobligedtoconsultKITAGAWAaswellasyourgovernmentfortherelatedregulationpriortoanytransaction.
Kitagawa Corporation KitagawaGlobalhandCompany
77 - 1 ,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan Tel.[phone] Fax.[phone]
F2020.03.300
KITAGAWA-NORTHTECHINC.
TECNARATOOLINGSYSTEMS,INC.
KITAGAWAEUROPELTD.
KITAGAWAEUROPEGmbH
KITAGAWAEUROPEGmbHPolandOffice
KITAGAWAEUROPEGmbHCzechOffice
KITAGAWAEUROPEGmbHRomaniaOffice
KITAGAWAEUROPEGmbHHungaryOffice
KITAGAWAINDIAPVTLTD.
KITAGAWA(THAILAND)CO.,LTD.BangkokBranch
KitagawaCorporation(Shanghai)
KitagawaCorporation(Shanghai)GuangzhouOffice
DEAMARKLIMITED
KITAGAWAKOREAAGENTCO.,LTD.
DIMACTOOLINGPTY.LTD.
301E.CommerceDr,Schaumburg,IL.60173USA
12535McCannDr,SantaFeSprings,CA.90670USA
Unit1TheHeadlands,Downton,Salisbury,WiltshireSP53JJ,UnitedKingdom
Borsigstrasse3,40880,RatingenGermany
44-240Zory,ul.Niepodleglosci3Poland
Purkynova125,61200Brno,CzechRepublic
StradaHeliului15,Bucharest1,013991,Romania
DeryT.u.5,H-9024Gyor,Hungary
PlotNo.42,2ndPhaseJiganiIndustrialArea,Jigani,Bangalore
 −  560105,Karnataka,India
9thFL,HomePlaceOfficeBuilding,283/43Sukhumvit55Rd.(Thonglor13),Klongton-Nua,Wattana,Bangkok10110,Thailand
Room3083FBuildingB.FarEastInternationalPlaza,No.317XianXiaRoad,ChangNing,Shanghai,200051,China
B07,25/F,WestTower,YangchengInternationalTradingCentre,No.122,EastTiyuRoad,TianheDistrict,Guangzhou,China
No.6,Lane5,LinSenNorthRoad,Taipei,Taiwan
803Ho,B-Dong,WoolimLion'sValley,371-28Gasan-Dong,Gumcheon-Gu,Seoul,Korea
69-71WilliamsRd,DandenongSouth,Victoria,3175Australia
Tel.[phone]
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AmericaContact
EuropeContact
AsiaContact
OceaniaContact
http://www.kitagawa.us
http://www.tecnaratools.com
http://www.kitagawa.global/en
http://www.kitagawa.global/de
http://www.kitagawa.global/pl
http://www.kitagawa.global/cz
http://www.kitagawa.global/ro
http://www.kitagawa.global/hu
http://www.kitagawa.global/in
http://www.kiw-sh.com
http://www.deamark.com.tw
http://www.kitagawa.co.kr
http://www.dimac.com.au
1-405-1,Kita-ku,Yosino-cho,Saitama-shi,Saitama,331-9634,Japan
4-15-13,Yamatomachi,Wakabayashi-ku,Sendai-shi,Miyagi,984-0042,Japan
2-62,Kamitakabata,Nakagawa-ku,Nagoya-shi,Aichi,454-0873,Japan
3-2-9,Kitakagaya,Suminoe-ku,Osaka-shi,Osaka,559-0011,Japan
77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan
7-6-39,Itazuke,Hakata-ku,Fukuoka-shi,Fukuoka,812-0888,Japan
77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan
Tel.[phone]
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Tel.[phone]
Fax.[phone]
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1
2
Thismanualprovidesdetailedinformationabouthowtosafelyandcorrectlyusethepowerchuck(HWtype)foralathe.
Beforestartingtousethispowerchuck,readthismanualcarefullyandalwaysfollowtheinstructionsandwarningsin
"ImportantSafetyPrecautions"and"PrecautionsforUse"atbeginningofthemanual.Failuretofollowthese
precautionscouldresultinaseriousaccident.
Inthismanual,precautionsforhandlingthatareconsideredespeciallyimportantareclassifiedanddisplayedasshownbelow
dependingonthedamageof riskincludingtheseriousnessoftheharmthatcouldresult.Pleasesufficientlyunderstandthe
meaningsofthesetermsandfollowtheinstructionsforsafeoperation.
Thetriangleisthesafetyalertsymbolusedtoalertyoutopotentialsafetyhazardsthatcouldresultininjuryordeath.
SafetyAlertSymbol
Preface
TermsandSymbolsUsedforSafetyMessages
Thisproductissuitableforgrippingaworkpieceonthelathesorrotarytables.Thisproductisequippedwiththejawsto
clamptheworkpieceandtheyoperatebymeansofarotarycylinder.Foranyotherapplications,pleasecontactus.
Ourcompany will not assume responsibility for injury, death, damage, or loss resulting from not following the
instructionsinthismanual.
Therearecountlessthingsthatcannotorshouldnotbedone,anditisimpossibletocoveralloftheminthismanual.
Therefore,donotperform any actionsunlesstheyarespecifically allowed inthismanual.Ifany questions relatedto
safetyariseaboutoperation,control,inspectionandmaintenancewhicharenotspecifiedinthismanual,pleaseconfirm
themwithourcompanyordistributorbeforeperformingthem.
LiabilityandHowtoUsethisManual
Theguaranteeperiodofthisproductis1yearafterdelivery.
Use the parts delivered by Kitagawa Corporatin for all the parts including consumable parts. We will not assume
responsibilityfor injury,death, damage,or loss causedby usageof partsnot manufacturedby Kitagawa Corporatin.
Additionally,if parts otherthan genuine parts manufactured byKitagawa Corporatin areused, thisguarantee will be
completelyinvalid.
The chuck and cylinder from Kitagawa Corporatin should be used together. If you must use a part not made by
Kitagawa,checkwithusorourdistributortobesureitissafetodoso.Wewillnotberesponsibleforinjury,death,
damageorlosscausedbyuseofachuckorcylindermadebyanothercompanyunlessthisusehasbeenapprovedby
Kitagawaoritsdistributor.
GuaranteeandLimitationofLiability
Indicatesahazardoussituationwhich,ifyounotavoided,
willresultindeathorseriousinjury.
Indicatesahazardoussituationwhich,ifyounotavoided,
couldresultindeathorseriousinjury.
Indicatesahazardoussituationwhich,ifyounotavoided,
couldresultinminorormoderateinjury.
Indicatesinstructionswhich,ifnotavoided,couldresultin
damagetotheequipmentorashortenedworklife.
DANGER
WARNING
CAUTION
NOTICE
TableofContents
1.StructuralDrawingandPartsList
1-1.Typedisplay
1-2.Structuraldrawing
1-3.Scopeofproduct
1-4.Partslist
2. ImportantSafetyPrecautions
3.Specifications
3-1.Specifications
3-2.Relationshipbetweengrippingforceandrotationspeed
3-3.Relationshipbetweengrippingpartcenterheight,staticgripingforceandinputforce/
Relationshipbetweentopjawmassmomentandgrippingforceloss
4.FormingSoftJaw
4-1.Attachmentofsoftjaw
4-2.Formingsoftjaw
4-3.Differencepermissiblerange
4-4.Operatingsequenceof2pairsofjaws
5.Usage
5-1.Precautionsduringgrippingworkwithchuck
5-2.Precautionsduringgrippingworkinirregularshape
5-3.Precautionsrelatedtousageofjaw
5-4.Precautionsrelatedtoprocessing
5-5.Attachmentoflocatorandjig
6.MaintenanceandInspection
6-1.PeriodicInspection
6-2.Greaselubrication
6-3.Disassembling
7.MalfunctionandCountermeasures
7-1.Inthecaseofmalfunction
7-2.Wheretocontactinthecaseofmalfunction
ForMachineToolManufacturers(Chapter8)
8.Attachment
8-1.Outlinedrawingofattachment
8-2.Manufacturingofthedrawbarandthedrawpipe
8-3.Manufacturingofthebackplate
8-4.Attachmentofchuck
9.OtherInformation
9-1.Aboutstandardsandorders
9-2.Informationaboutmarkingsofproduct
9-3.Aboutdisposal
……………………………………………………………… 3
………………………………………………………… 6
…………………………………………………………………………………… 12
……………………………………………………………………………… 17
…………………………………………………………………………………………… 19
………………………………………………………………… 21
…………………………………………………………… 23
……………………………………………………………………………………… 24
……………………………………………………………………………… 29

1
2
Thismanualprovidesdetailedinformationabouthowtosafelyandcorrectlyusethepowerchuck(HWtype)foralathe.
Beforestartingtousethispowerchuck,readthismanualcarefullyandalwaysfollowtheinstructionsandwarningsin
"ImportantSafetyPrecautions"and"PrecautionsforUse"atbeginningofthemanual.Failuretofollowthese
precautionscouldresultinaseriousaccident.
Inthismanual,precautionsforhandlingthatareconsideredespeciallyimportantareclassifiedanddisplayedasshownbelow
dependingonthedamageof riskincludingtheseriousnessoftheharmthatcouldresult.Pleasesufficientlyunderstandthe
meaningsofthesetermsandfollowtheinstructionsforsafeoperation.
Thetriangleisthesafetyalertsymbolusedtoalertyoutopotentialsafetyhazardsthatcouldresultininjuryordeath.
SafetyAlertSymbol
Preface
TermsandSymbolsUsedforSafetyMessages
Thisproductissuitableforgrippingaworkpieceonthelathesorrotarytables.Thisproductisequippedwiththejawsto
clamptheworkpieceandtheyoperatebymeansofarotarycylinder.Foranyotherapplications,pleasecontactus.
Ourcompany will not assume responsibility for injury, death, damage, or loss resulting from not following the
instructionsinthismanual.
Therearecountlessthingsthatcannotorshouldnotbedone,anditisimpossibletocoveralloftheminthismanual.
Therefore,donotperform any actionsunlesstheyarespecifically allowed inthismanual.Ifany questions relatedto
safetyariseaboutoperation,control,inspectionandmaintenancewhicharenotspecifiedinthismanual,pleaseconfirm
themwithourcompanyordistributorbeforeperformingthem.
LiabilityandHowtoUsethisManual
Theguaranteeperiodofthisproductis1yearafterdelivery.
Use the parts delivered by Kitagawa Corporatin for all the parts including consumable parts. We will not assume
responsibilityfor injury,death, damage,or loss causedby usageof partsnot manufacturedby Kitagawa Corporatin.
Additionally,if parts otherthan genuine parts manufactured byKitagawa Corporatin areused, thisguarantee will be
completelyinvalid.
The chuck and cylinder from Kitagawa Corporatin should be used together. If you must use a part not made by
Kitagawa,checkwithusorourdistributortobesureitissafetodoso.Wewillnotberesponsibleforinjury,death,
damageorlosscausedbyuseofachuckorcylindermadebyanothercompanyunlessthisusehasbeenapprovedby
Kitagawaoritsdistributor.
GuaranteeandLimitationofLiability
Indicatesahazardoussituationwhich,ifyounotavoided,
willresultindeathorseriousinjury.
Indicatesahazardoussituationwhich,ifyounotavoided,
couldresultindeathorseriousinjury.
Indicatesahazardoussituationwhich,ifyounotavoided,
couldresultinminorormoderateinjury.
Indicatesinstructionswhich,ifnotavoided,couldresultin
damagetotheequipmentorashortenedworklife.
DANGER
WARNING
CAUTION
NOTICE
TableofContents
1.StructuralDrawingandPartsList
1-1.Typedisplay
1-2.Structuraldrawing
1-3.Scopeofproduct
1-4.Partslist
2. ImportantSafetyPrecautions
3.Specifications
3-1.Specifications
3-2.Relationshipbetweengrippingforceandrotationspeed
3-3.Relationshipbetweengrippingpartcenterheight,staticgripingforceandinputforce/
Relationshipbetweentopjawmassmomentandgrippingforceloss
4.FormingSoftJaw
4-1.Attachmentofsoftjaw
4-2.Formingsoftjaw
4-3.Differencepermissiblerange
4-4.Operatingsequenceof2pairsofjaws
5.Usage
5-1.Precautionsduringgrippingworkwithchuck
5-2.Precautionsduringgrippingworkinirregularshape
5-3.Precautionsrelatedtousageofjaw
5-4.Precautionsrelatedtoprocessing
5-5.Attachmentoflocatorandjig
6.MaintenanceandInspection
6-1.PeriodicInspection
6-2.Greaselubrication
6-3.Disassembling
7.MalfunctionandCountermeasures
7-1.Inthecaseofmalfunction
7-2.Wheretocontactinthecaseofmalfunction
ForMachineToolManufacturers(Chapter8)
8.Attachment
8-1.Outlinedrawingofattachment
8-2.Manufacturingofthedrawbarandthedrawpipe
8-3.Manufacturingofthebackplate
8-4.Attachmentofchuck
9.OtherInformation
9-1.Aboutstandardsandorders
9-2.Informationaboutmarkingsofproduct
9-3.Aboutdisposal
……………………………………………………………… 3
………………………………………………………… 6
…………………………………………………………………………………… 12
……………………………………………………………………………… 17
…………………………………………………………………………………………… 19
………………………………………………………………… 21
…………………………………………………………… 23
……………………………………………………………………………………… 24
……………………………………………………………………………… 29

2
1
4
3
Leverpin
Topjaw
(Softjaw.hardjaw.
specialjawincluded)
T-nut
Masterjaw
Lever
Plungerpiston
Plunger
Drawnut
Locknut
Body
Chuck
attachingbolt
Plug
Drawscrew
Cover
NClathe
SOL.
Cylinder
Chuck
Linefilter
Pressure
gauge
Manual
switching
valve
Solenoid
valve
Hydraulicpump
Pressure
adjusting
screw
FlexiblehoseDrainhose
Tank
3
4
Typedisplayasshownbelow
1-1.Typedisplay
1-2.Structuraldrawing
Fig.1
Fig.2
1.StructuralDrawingandPartsList
ＨＷ−08Ａ6999
Thisinstructionmanualisforthechuckpart.
1-3.Scopeofproduct
Fig.3
・Topreventtheworkfromflying,safedesign,maintenanceanderroneousactionpreventionofthehydraulicsys-
temtomaintainthegrippingforceofthechuckisextremelyimportant.ThoroughlyreadtheImportantSafety
Precautionsonandafterpage6inthismanual.
・Asforthecylinder,followtheinstructionmanualforthecylinder.
DesignNo.
HWseries
Attachmentshape
Straightspigotjoint：ー
A2ー5 ：A5
A2ー6 ：A6
A2ー8 ：A8
A2ー11 ：A1
Chucknominaldiameter
(Inch)
WARNING

2
1
4
3
Leverpin
Topjaw
(Softjaw.hardjaw.
specialjawincluded)
T-nut
Masterjaw
Lever
Plungerpiston
Plunger
Drawnut
Locknut
Body
Chuck
attachingbolt
Plug
Drawscrew
Cover
NClathe
SOL.
Cylinder
Chuck
Linefilter
Pressure
gauge
Manual
switching
valve
Solenoid
valve
Hydraulicpump
Pressure
adjusting
screw
FlexiblehoseDrainhose
Tank
3
4
Typedisplayasshownbelow
1-1.Typedisplay
1-2.Structuraldrawing
Fig.1
Fig.2
1.StructuralDrawingandPartsList
ＨＷ−08Ａ6999
Thisinstructionmanualisforthechuckpart.
1-3.Scopeofproduct
Fig.3
・Topreventtheworkfromflying,safedesign,maintenanceanderroneousactionpreventionofthehydraulicsys-
temtomaintainthegrippingforceofthechuckisextremelyimportant.ThoroughlyreadtheImportantSafety
Precautionsonandafterpage6inthismanual.
・Asforthecylinder,followtheinstructionmanualforthecylinder.
DesignNo.
HWseries
Attachmentshape
Straightspigotjoint：ー
A2ー5 ：A5
A2ー6 ：A6
A2ー8 ：A8
A2ー11 ：A1
Chucknominaldiameter
(Inch)
WARNING

5
6
1-4.Partslist
Table1
Eyeboltisthestandardattachedincaseof10inchormore.
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
No.
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Quantity
1
1
1
2
2
4
4
2
2
4
1
1
1
1
1
1
1
4
Partname Partname
Body
Plunger
Plungerpiston
Masterjaw（1-3）
Masterjaw（2-4）
Softjaw
Lever
Leverpin（1-3）
Leverpin（2-4）
T-nut
Cover
Plug
Locknut
Drawscrew
Drawnut
Coilspring
Connectinghandle
Chuckattachingbolt
Jawattachingbolt
Socketheadcapscrew
Socketheadcapscrew
Setscrew
Setscrew
Setscrew
Setscrew
Setscrew
Greasenipple
Locknutlockingscrew
Steelball
Hex.key
Hex.key
Hex.key
Hex.key
Hex.key
Hex.key
Eyebolt
Quantity
8
4
4
2
4
1
1
4
4
2or3
1
1
1
1
1
1
1
1
Fig.4
11141215328132224
1962010 33
31
3227
8
7
23
26
1
9
5203634
18
25 29 16
29
16
24 17 21 35
30
Importantsafetyprecautionsaresummarizedbelow.Pleasereadthissectionbeforefirststartingtousethisproduct.
Turnoffmainpowersupplybeforeattaching,
inspectingorreplacingchuck,andbeforeaddingoil.
・The chuck maystart rotation
suddenly, andapart ofthe
bodyorclothingmaybecaught.
Closedoorbeforerotatingspindle.
・If the door is not closed, you may touch
therotatingchuckortheworkmayflyout,
which is very dangerous. (In general, the
safety interlock function which allows
rotationonlywhenthedooristhemanual
modeorthetestmode)
Duringspindlerotation,donotturnoffhydraulicpumppowersupplyand
donotoperateswitchingvalve.
・Cuttingoffhydraulicpressure
causesadropinthegripping
force which could result in
thework beingreleasedand
flyingout.
・Operatingthemanualswitch-
ing valve orsolenoid valve
willleadtoadropofhydraul-
icpressure.
2. ImportantSafetyPrecautions
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
ForAllUsers
ForAllUsers
ForAllUsers
Manualswitchingvalve
Close
Open
ON
OFF Solenoidvalve
NO
Work
Mainpowersupply
ＯＦＦ
ON
OFF Lathe
Close
Lathe

5
6
1-4.Partslist
Table1
Eyeboltisthestandardattachedincaseof10inchormore.
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
No.
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Quantity
1
1
1
2
2
4
4
2
2
4
1
1
1
1
1
1
1
4
Partname Partname
Body
Plunger
Plungerpiston
Masterjaw（1-3）
Masterjaw（2-4）
Softjaw
Lever
Leverpin（1-3）
Leverpin（2-4）
T-nut
Cover
Plug
Locknut
Drawscrew
Drawnut
Coilspring
Connectinghandle
Chuckattachingbolt
Jawattachingbolt
Socketheadcapscrew
Socketheadcapscrew
Setscrew
Setscrew
Setscrew
Setscrew
Setscrew
Greasenipple
Locknutlockingscrew
Steelball
Hex.key
Hex.key
Hex.key
Hex.key
Hex.key
Hex.key
Eyebolt
Quantity
8
4
4
2
4
1
1
4
4
2or3
1
1
1
1
1
1
1
1
Fig.4
11141215328132224
1962010 33
31
3227
8
7
23
26
1
9
5203634
18
25 29 16
29
16
24 17 21 35
30
Importantsafetyprecautionsaresummarizedbelow.Pleasereadthissectionbeforefirststartingtousethisproduct.
Turnoffmainpowersupplybeforeattaching,
inspectingorreplacingchuck,andbeforeaddingoil.
・The chuck maystart rotation
suddenly, andapart ofthe
bodyorclothingmaybecaught.
Closedoorbeforerotatingspindle.
・If the door is not closed, you may touch
therotatingchuckortheworkmayflyout,
which is very dangerous. (In general, the
safety interlock function which allows
rotationonlywhenthedooristhemanual
modeorthetestmode)
Duringspindlerotation,donotturnoffhydraulicpumppowersupplyand
donotoperateswitchingvalve.
・Cuttingoffhydraulicpressure
causesadropinthegripping
force which could result in
thework beingreleasedand
flyingout.
・Operatingthemanualswitch-
ing valve orsolenoid valve
willleadtoadropofhydraul-
icpressure.
2. ImportantSafetyPrecautions
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
ForAllUsers
ForAllUsers
ForAllUsers
Manualswitchingvalve
Close
Open
ON
OFF Solenoidvalve
NO
Work
Mainpowersupply
ＯＦＦ
ON
OFF Lathe
Close
Lathe

7
8
Donotallowtherotationspeedofthechucktoexceed
themaximumallowablespeedlimit.(Refertopages13-16)
・If the rotation speed of the chuck
exceedsthe rotation speed limit,
thisisverydangerousasthechuck
andworkwillflyout.
Theinputforceofthechuck(pistonthrust,pullingforceofthedrawpipe)
mustnotexceedtheallowablemaximuminputforce.
(Refertopages13-16)
・Input must match the specification of the
chuck.
・Adjustthe hydraulicpressuretothecylin-
der so that the input force, which deter-
mines thegripping force ofthechuck,
doesnotexceed.
・Excessive input force can lead to break-
ageofthechuck,whichisverydangerous,
as the chuck can work can be damaged
andflyout.
Donotusethechuckexceedingthedifferencepermissiblerange
ofjawstrokes. (Refertopage18)
・Grippingtheworkpieceexceedingthedifferencepermissiblerangebreaksthechuckorresults
inaworkpiecegrippingfailure,causingtheworkpiecetobedamagedortoflyout.
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
ForAllUsers
ForAllUsers
ForAllUsers
Flyout
Work
Chuck
Work
Allowablemaximum
inputforceorless
Flyout
Cylinder
Drawpipe
ImportantSafetyPrecautions
Keeptheheightofthejawwithintherangespecifiedinthegrippingforce
limittable(Refertopage15).Ifyoumustuseajawtallerthanastandard
softjaw,uselessthantheinput(pistonthrustforce,
drawpipedrawingforce)specifiedinthegrippingforcelimittable.
・Donotuseajawofaheightoutof
therange ofthegripping forcelimit
table or a jaw with mass moment
outoftherangeofthegrippingforce
limittable.Thechuckwillbreakand
the chuck and work will break and
flyout.
・Adjust the hydraulicpressure to the
cylindertoobtaintherequired gripping
force.Ifthegrippingforceisinsufficient,
this is dangerous as the work will fly
out.
Determinethegrippingforcerequiredforprocessingbythemachinetool
manufactureroruser,andcheckthattherequiredgrippingforceis
providedbeforeprocessing.
(Refertopages13-16andcylindermanual)
・Iftheprotrusionislong,thetipoftheworkcanturnandtheworkflyout.
Whentheprotrusionoftheworkislong,
supportitwiththesteadyrestorcenter.
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
ForAllUsers
ForAllUsers
ForAllUsers
PRESSURE
GAUGE
DOWN
Lowerthehydraulic
pressurewhenusing
atalljaw
Specialtop
jawheight
Standardsoft
jawheight
Work
Tailstock
Center
Flyout
Work

7
8
Donotallowtherotationspeedofthechucktoexceed
themaximumallowablespeedlimit.(Refertopages13-16)
・If the rotation speed of the chuck
exceedsthe rotation speed limit,
thisisverydangerousasthechuck
andworkwillflyout.
Theinputforceofthechuck(pistonthrust,pullingforceofthedrawpipe)
mustnotexceedtheallowablemaximuminputforce.
(Refertopages13-16)
・Input must match the specification of the
chuck.
・Adjustthe hydraulicpressuretothecylin-
der so that the input force, which deter-
mines thegripping force ofthechuck,
doesnotexceed.
・Excessive input force can lead to break-
ageofthechuck,whichisverydangerous,
as the chuck can work can be damaged
andflyout.
Donotusethechuckexceedingthedifferencepermissiblerange
ofjawstrokes. (Refertopage18)
・Grippingtheworkpieceexceedingthedifferencepermissiblerangebreaksthechuckorresults
inaworkpiecegrippingfailure,causingtheworkpiecetobedamagedortoflyout.
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
ForAllUsers
ForAllUsers
ForAllUsers
Flyout
Work
Chuck
Work
Allowablemaximum
inputforceorless
Flyout
Cylinder
Drawpipe
ImportantSafetyPrecautions
Keeptheheightofthejawwithintherangespecifiedinthegrippingforce
limittable(Refertopage15).Ifyoumustuseajawtallerthanastandard
softjaw,uselessthantheinput(pistonthrustforce,
drawpipedrawingforce)specifiedinthegrippingforcelimittable.
・Donotuseajawofaheightoutof
therange ofthegripping forcelimit
table or a jaw with mass moment
outoftherangeofthegrippingforce
limittable.Thechuckwillbreakand
the chuck and work will break and
flyout.
・Adjust the hydraulicpressure to the
cylindertoobtaintherequired gripping
force.Ifthegrippingforceisinsufficient,
this is dangerous as the work will fly
out.
Determinethegrippingforcerequiredforprocessingbythemachinetool
manufactureroruser,andcheckthattherequiredgrippingforceis
providedbeforeprocessing.
(Refertopages13-16andcylindermanual)
・Iftheprotrusionislong,thetipoftheworkcanturnandtheworkflyout.
Whentheprotrusionoftheworkislong,
supportitwiththesteadyrestorcenter.
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
ForAllUsers
ForAllUsers
ForAllUsers
PRESSURE
GAUGE
DOWN
Lowerthehydraulic
pressurewhenusing
atalljaw
Specialtop
jawheight
Standardsoft
jawheight
Work
Tailstock
Center
Flyout
Work

9
10
10
ImportantSafetyPrecautions
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
Useofachuckandcylinderthatcannotbeusedtogethersafely
maycausethecylindertobreakathighpressureresulting
inthechuckandworkflyingout.
Inthecaseofprocessingasignificantunbalancedwork,
lowertherotationspeed.
Alwaystightentheboltsatthespecifiedtorque.Ifthetorqueisinsufficientorexcessive,
theboltwillbreak,whichisdangerousasthechuckorworkwillflyout.
Usetheboltsattachedtothechuck,anddonotuseboltsotherthanthese.
・Checkthatthechuckandthecylinderareinthesafecombinationwhenusingathighpressurewith
ourcompanyorthedistributor.Especiallywhenthecylinderofourcompanyandahighpressurechuckof
othercompanyarecombined,confirmationisnecessary.
・Ifoneoftheabnormaleventsshownbelowoccursduringoperation,immediatelystopthemachineand
consultwithourcompanyorthedistributor.
・Unbalancedworkgeneratesdangerouscentri-
fugalforcesandtheworkcouldflyout.
・Theworkslips.
・Lossofaccuracy.
・Theworkbeginstochatter.
・Themachine'svibrationsignificantlyincreases.
・The griping force does not rise even if
hydraulicpressureisraised.
・If the torque is insufficient or excessive,
theboltwillbreak, whichis dangerousas
thechuckorworkwillflyout.
・Fix the lathe spindle or the chuck when
youtightenbolts.Yourhandcouldslipand
getinjurywhenyouworkwithoutfixingthe
spindle.
・You cannot control the torque by a hex
key.Youmustuseatorquewrenchfortor-
quecontrol.
・Tighteningtorqueismomentofforcewhenyoutightenabolt.
Tighteningtorque=F×L.
TighteningtorqueＴ=Ｆ×Ｌ
=127×0.1
=12.7(N・m)
Ｌ=0.1(m)
Ｆ=127(N)
(13kgf)
Specifiedtorqueforsocketheadcapscrew
Boltsize Tighteningtorque
M5
M6
M8
M10
7.5N・m
13N・m
33N・m
73N・m
Boltsize Tighteningtorque
M12
M14
M16
M20
107N・m
171N・m
250N・m
402N・m
Chuck
Work
Flyout
Cylinder
Drawpipe
Unbalancedwork
Flyout
ForAllUsers
ForAllUsers
ForAllUsers
Thedraw-baranddraw-pipemusthaveenoughstrength.
(Refertopages25-26)
Thedraw-baranddraw-pipemusthaveenoughscrew-indepth.
Thedraw-baranddraw-pipemustbetightenedsurely.
・If the draw-bar or draw-pipe is broken, a gripping force is lost instantaneously, causing the
workpiecetoflyout.
・If the draw-bar or draw-pipe is screwed in inadequately, the screw is broken and a gripping
forceislostinstantaneously,causingtheworkpiecetoflyout.
・If the draw-bar or draw-pipe screw is meshed loosely, the vibration occurs or the screw is
broken.Ifthescrewisbroken,agrippingforceislostinstantaneously,causingtheworkpieceto
flyout.
・Ifthedraw-barordraw-pipeisunbalanced,thevibrationoccursandthescrewisbroken,and
thenagrippingforceislostinstantaneously,causingtheworkpiecetoflyout.
Useacylinderwithalockvalve(safetyvalve,checkvalve)incorporatedincaseof
suddenhydraulicpressuredropduetoblackout,malfunctionofthehydraulicpump,etc.
Further,useasolenoidvalvewithacircuitthatretains
thegrippingpositionwhennocurrentiscarried.
・If the hydraulic pressure suddenly drops
due to blackout or malfunction of the
hydraulicpump,etc.,thisisdangerousas
workwillflyout.
・Lock valve retains the hydraulic pressure
inside the cylinder temporarily, when the
hydraulicpressuresuddenlydropsdue to
blackout or malfunction of the hydraulic
pump,etc.
Gripping Loosening
Thegrippingposition
mustberetained.
Solenoidvalve
P
Cylinder
Lightening
＝Blackout
Lockvalve
ForMachineToolManufactures
ForMachineToolManufactures
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER

9
10
10
ImportantSafetyPrecautions
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
Useofachuckandcylinderthatcannotbeusedtogethersafely
maycausethecylindertobreakathighpressureresulting
inthechuckandworkflyingout.
Inthecaseofprocessingasignificantunbalancedwork,
lowertherotationspeed.
Alwaystightentheboltsatthespecifiedtorque.Ifthetorqueisinsufficientorexcessive,
theboltwillbreak,whichisdangerousasthechuckorworkwillflyout.
Usetheboltsattachedtothechuck,anddonotuseboltsotherthanthese.
・Checkthatthechuckandthecylinderareinthesafecombinationwhenusingathighpressurewith
ourcompanyorthedistributor.Especiallywhenthecylinderofourcompanyandahighpressurechuckof
othercompanyarecombined,confirmationisnecessary.
・Ifoneoftheabnormaleventsshownbelowoccursduringoperation,immediatelystopthemachineand
consultwithourcompanyorthedistributor.
・Unbalancedworkgeneratesdangerouscentri-
fugalforcesandtheworkcouldflyout.
・Theworkslips.
・Lossofaccuracy.
・Theworkbeginstochatter.
・Themachine'svibrationsignificantlyincreases.
・The griping force does not rise even if
hydraulicpressureisraised.
・If the torque is insufficient or excessive,
theboltwillbreak, whichis dangerousas
thechuckorworkwillflyout.
・Fix the lathe spindle or the chuck when
youtightenbolts.Yourhandcouldslipand
getinjurywhenyouworkwithoutfixingthe
spindle.
・You cannot control the torque by a hex
key.Youmustuseatorquewrenchfortor-
quecontrol.
・Tighteningtorqueismomentofforcewhenyoutightenabolt.
Tighteningtorque=F×L.
TighteningtorqueＴ=Ｆ×Ｌ
=127×0.1
=12.7(N・m)
Ｌ=0.1(m)
Ｆ=127(N)
(13kgf)
Specifiedtorqueforsocketheadcapscrew
Boltsize Tighteningtorque
M5
M6
M8
M10
7.5N・m
13N・m
33N・m
73N・m
Boltsize Tighteningtorque
M12
M14
M16
M20
107N・m
171N・m
250N・m
402N・m
Chuck
Work
Flyout
Cylinder
Drawpipe
Unbalancedwork
Flyout
ForAllUsers
ForAllUsers
ForAllUsers
Thedraw-baranddraw-pipemusthaveenoughstrength.
(Refertopages25-26)
Thedraw-baranddraw-pipemusthaveenoughscrew-indepth.
Thedraw-baranddraw-pipemustbetightenedsurely.
・If the draw-bar or draw-pipe is broken, a gripping force is lost instantaneously, causing the
workpiecetoflyout.
・If the draw-bar or draw-pipe is screwed in inadequately, the screw is broken and a gripping
forceislostinstantaneously,causingtheworkpiecetoflyout.
・If the draw-bar or draw-pipe screw is meshed loosely, the vibration occurs or the screw is
broken.Ifthescrewisbroken,agrippingforceislostinstantaneously,causingtheworkpieceto
flyout.
・Ifthedraw-barordraw-pipeisunbalanced,thevibrationoccursandthescrewisbroken,and
thenagrippingforceislostinstantaneously,causingtheworkpiecetoflyout.
Useacylinderwithalockvalve(safetyvalve,checkvalve)incorporatedincaseof
suddenhydraulicpressuredropduetoblackout,malfunctionofthehydraulicpump,etc.
Further,useasolenoidvalvewithacircuitthatretains
thegrippingpositionwhennocurrentiscarried.
・If the hydraulic pressure suddenly drops
due to blackout or malfunction of the
hydraulicpump,etc.,thisisdangerousas
workwillflyout.
・Lock valve retains the hydraulic pressure
inside the cylinder temporarily, when the
hydraulicpressuresuddenlydropsdue to
blackout or malfunction of the hydraulic
pump,etc.
Gripping Loosening
Thegrippingposition
mustberetained.
Solenoidvalve
P
Cylinder
Lightening
＝Blackout
Lockvalve
ForMachineToolManufactures
ForMachineToolManufactures
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER

11
10
Donotmodifythechuckinawaynotpermitted
bythemanufacturer.
・It may not only break the chuck but
thechuck andtheworkmayflyout,
whichisdangerous.
・If you attach a locator or jig on the
chuck bodysurface,only process
workinanacceptablerange(Referto
page20).
・Insufficientgrease supplylowersthe grip-
pingforce,causesoperationfailuredueto
lower hydraulic pressure, lowers the grip-
pingprecision, and causes abnormal
wearingandseizing,etc.
・Thisisdangerousastheworkcouldflyout
fromadropinthegrippingforce.
12
Periodicallysupplyadequategrease(Refertopage21).
Turnoffpowerbeforeaddinggrease.
Donotgripachuckwithachuck.
・Becauseitiseasytoconfusethespecifi-
cations of each chuck and the protrusion
become long and is apt to raise rotation
speed, it is apt to exceed the specifica-
tions of the base chuck. The chuck may
breakandthechuckorworkcouldflyout.
Donotoperatethemachineafterdrinking
alcoholortakingmedication.
Donotoperatethemachinewearinggloves,
anecktie,andother
looseclothingorjewelry.
・Dangerous since these lead to operation
mistakesandmisjudgment.
・Dangeroussinceitwillbecaught.
3-1.Specifications
Plungerstroke
Jawstroke(indiameter)
Allowablemaximum
rotationspeed
Standardsoftjawheight(Zaxis)
Grippingrange
(outsidediametergripping)
Mass
(standardsoftjawincluded)
Momentofinertia
Matchingcylinder
Maximumhydraulicpressure
(withmatchingcylinder)
Balancequality
(standardsoftjawnotincluded)
Storingtemperature/
Operatingtemperature
mm
mm

min-1
mm
mm
kg
kg・m2
17
13.2
3000
39
φ23〜210
23
0.153
YW1220R
Type HW-08 HW-10 HW-12 HW-15
Reference：1kN=101.97kgf1MPa=10.197kgf/cm2
Whenstoringthisproduct,theproductshouldbesubjectedtotheantirusttreatmentandstoredinaplacefreefrom
wetting,condensation,orfreeze.
G6.3
−20〜＋50℃／−10〜＋40℃
Table2
kN
(kgf)
kN
(kgf)
kN
(kgf)
kN
(kgf)
MPa
(kgf/cm2)
No.1-3jaw
No.2-4jaw
No.1-3jaw
No.2-4jaw 28
(2855)
1.71
(17.4)
16.5
(1683)
16.5
(1683)
28
(2855)
22
16
2000
45
φ50〜270
50
0.500
YW1220R
42
(4283)
2.29
(23.4)
23
(2345)
23
(2345)
42
(4283)
22
16
1500
45
φ50〜304
58
0.700
YW1225R
42
(4283)
2.29
(23.4)
23
(2345)
23
(2345)
42
(4283)
25
17
1200
53
φ59〜381
118
2.250
YW1225R
54
(5506)
2.73
(27.8)
28
(2855)
28
(2855)
54
(5506)
ImportantSafetyPrecautions
Failuretofollowthesafetyprecautionsbelowcouldresultin
seriousinjuryordeath.
WARNING
ForAllUsers
ForAllUsers
ForAllUsersForAllUsers
ForAllUsers
3.Specifications
Allowable
maximum
inputforce
Maximum
Static
grippingforce
NO
Greasegun
Grease
nipple
Alcohol Medication

11
10
Donotmodifythechuckinawaynotpermitted
bythemanufacturer.
・It may not only break the chuck but
thechuck andtheworkmayflyout,
whichisdangerous.
・If you attach a locator or jig on the
chuck bodysurface,only process
workinanacceptablerange(Referto
page20).
・Insufficientgrease supplylowersthe grip-
pingforce,causesoperationfailuredueto
lower hydraulic pressure, lowers the grip-
pingprecision, and causes abnormal
wearingandseizing,etc.
・Thisisdangerousastheworkcouldflyout
fromadropinthegrippingforce.
12
Periodicallysupplyadequategrease(Refertopage21).
Turnoffpowerbeforeaddinggrease.
Donotgripachuckwithachuck.
・Becauseitiseasytoconfusethespecifi-
cations of each chuck and the protrusion
become long and is apt to raise rotation
speed, it is apt to exceed the specifica-
tions of the base chuck. The chuck may
breakandthechuckorworkcouldflyout.
Donotoperatethemachineafterdrinking
alcoholortakingmedication.
Donotoperatethemachinewearinggloves,
anecktie,andother
looseclothingorjewelry.
・Dangerous since these lead to operation
mistakesandmisjudgment.
・Dangeroussinceitwillbecaught.
3-1.Specifications
Plungerstroke
Jawstroke(indiameter)
Allowablemaximum
rotationspeed
Standardsoftjawheight(Zaxis)
Grippingrange
(outsidediametergripping)
Mass
(standardsoftjawincluded)
Momentofinertia
Matchingcylinder
Maximumhydraulicpressure
(withmatchingcylinder)
Balancequality
(standardsoftjawnotincluded)
Storingtemperature/
Operatingtemperature
mm
mm

min-1
mm
mm
kg
kg・m2
17
13.2
3000
39
φ23〜210
23
0.153
YW1220R
Type HW-08 HW-10 HW-12 HW-15
Reference：1kN=101.97kgf1MPa=10.197kgf/cm2
Whenstoringthisproduct,theproductshouldbesubjectedtotheantirusttreatmentandstoredinaplacefreefrom
wetting,condensation,orfreeze.
G6.3
−20〜＋50℃／−10〜＋40℃
Table2
kN
(kgf)
kN
(kgf)
kN
(kgf)
kN
(kgf)
MPa
(kgf/cm2)
No.1-3jaw
No.2-4jaw
No.1-3jaw
No.2-4jaw 28
(2855)
1.71
(17.4)
16.5
(1683)
16.5
(1683)
28
(2855)
22
16
2000
45
φ50〜270
50
0.500
YW1220R
42
(4283)
2.29
(23.4)
23
(2345)
23
(2345)
42
(4283)
22
16
1500
45
φ50〜304
58
0.700
YW1225R
42
(4283)
2.29
(23.4)
23
(2345)
23
(2345)
42
(4283)
25
17
1200
53
φ59〜381
118
2.250
YW1225R
54
(5506)
2.73
(27.8)
28
(2855)
28
(2855)
54
(5506)
ImportantSafetyPrecautions
Failuretofollowthesafetyprecautionsbelowcouldresultin
seriousinjuryordeath.
WARNING
ForAllUsers
ForAllUsers
ForAllUsersForAllUsers
ForAllUsers
3.Specifications
Allowable
maximum
inputforce
Maximum
Static
grippingforce
NO
Greasegun
Grease
nipple
Alcohol Medication

14
13
3.Relationshipbetweengrippingforceandrotationspeed
As the rotation speed becomes higher, the centrifugal force of the jaw increases and the gripping force lowers. The
curves displayed in Fig. 6 shows relationships between the rotation speed and the centrifugal force when using the
standard soft jaw. The centrifugal force differs significantly depending on the size and shape of the top jaw and the
attaching position, therefore, when the rotation speed is high, actual measurement using a Kitagawa gripping force
meterisrequired.
Toavoidseriousaccidentscausedbythechuckorworkflyingout:
・Determinethegrippingforcerequiredforprocessingbythemachinetoolmanufactureroruser,andcheckthat
therequiredgrippingforceisprovidedbeforeprocessing.Thegrippingforceofthechuckmustnotexceedthe
maximumstaticgrippingforce.
・Determinethe rotation speedrequired for processing by themachine tool manufactureror user based on the
gripping force required for the processing. The rotation speed at this point must not exceed the allowable
maximumrotationspeed.
・Whendeterminingthecuttingconditions,refertopages14-16.
・Payattentionsincethegrippingforceisdifferentdependingonthestateoftheoilsupply,greaseinuse,heightof
thejaw,performanceofthepumpandthepressurereducingvalve,pipingstate,etc.
3-2.Relationshipbetweengrippingforceandrotationspeed
1.Maximumstaticgrippingforce
Thestaticgrippingforceisthegrippingforcewhenthechuckisatastop.
Thepowerchuckhasamechanismtoconvertinputforce(pistonthrustforce,drawpipedrawingforce)fromthecylinder
togrippingforce.Therefore,thegrippingforcewhentheallowablemaximuminputforcebecomesthemaximumstatic
grippingforce.
However,thegrippingforceisdifferentdependingonthestateofgreaselubrication,greaseinuse,heightofthejaw,
etc.Themaximumstaticgrippingforcespecifiedinthespecificationisthevalueunderthefollowingconditions:
・The Kitagawa standard soft jaw is used as the
jaw.
・Theattachingboltsofthesoftjawaretightened
atthespecifiedtorque.(Refertopage9)
・The numerical values areobtained with the
Kitagawa grippingforce meter.Thegripping
position ofthegripping force meter is at a
position1/2of the heightof the softjawtop
surface(heightfromthechucksurfacetothetop
surfaceofthejaw).
・CHUCK GREASE PRO is used. (Refer to page
21).
・Avariabledisplacementpumpwiththedischarge
volume of 20 liters/min or more is used as the
hydraulic source.Thepressureis set bythe
pressurecontrolequipmentofthepumpitself,or
the pressure reduction valve equipped
separately.
2.Allowablemaximumrotationspeed
Inthecaseofoutsidediametergripping,whenthechuckisrotated,thegrippingforcelowersduetothecentrifugalforce
ofthetopjaw.Therefore,therotationspeedwhenthedynamicgrippingforce(grippingforceduringrotation)becomes
approximately1/3ofthemaximumstaticgrippingforceissetastheallowablemaximumrotationspeed.Thecentrifugal
forceisdifferentdependingonthemassofthetopjawandthebarycentricpositionaswellastherotationspeed.The
allowablemaximumrotationspeedspecifiedinthespecificationisthevalueunderthefollowingconditions:
・TheKitagawastandardsoftjawisused.
・Gripthegrippingforcemeterinthecenterofthejawstroke,andatthispoint,thesoftjawisattachedattheposition
wheretheperipherysideendofthesoftjawandthechuckperipheryarealmostlinedup.
・ThenumericalvaluesareobtainedbytheKitagawagrippingforcemeter.Thegrippingpositionofthegrippingforce
meterisataposition1/2oftheheightofthesoftjawtopsurface(heightfromthechucksurfacetothetopsurfaceof
thejaw).
・Inthecaseofprocessingaconsiderablyunbalancedwork,lowertherotationspeed.Theworkwillflyoutandthisis
dangerous.
・Vibrationisgeneratedifthereisunbalanceduetotheworkandthejig,etc.Vibrationdecreasesprocessprecision
and shortens the working life of the chuck, even possibly breaking it. Correct the unbalance by using a balance
weight,etc.,orlowertherotationspeedforuse.
・Inthecaseofheavycuttingathighrotationspeed,vibrationiseasilygeneratedinthesamemannerastheunbalance
ofthechuck,therefore,setthecuttingconditionsappropriateforthedynamicgrippingforceandmachinerigidity.
Fig.6
3-3.Relationshipbetweengrippingpartcenterheight,
staticgripingforceandinputforce/
Relationshipbetweentopjawmassmomentandgrippingforceloss
Ifthegrippingpartcenterheightoftheusedtopjaw(dimensionHinFig.7)ishigherthanthegrippingpartcenterheightof
thestandardsoftjaw,alargeloadisappliedtothemasterjaw,Tnut,jawattachingbolts,etc.Topreventthesepartsfrom
beingbroken,itisnecessarytousethemachinebyusingalowerinputforcethantheallowablemaximuminputforce.
Additionally,ifthetopjawislargerandheavier,thecentrifugalforcegeneratedatthetopjawwillincrease.Itisnecessary
toexaminethedynamicgrippingforceconsideringthecentrifugalforceandtousethemachineatarotationspeedthat
canwithstandthecuttingforce.
Fig.7
A=B
G:Centerofmassofthetopjaw
m:Massofthetopjaw
r:Distancefromthecenterofmassofthetopjawtothechuckcenter
H:Grippingcenterheight
23kN
20kN
18kN
16kN
14kN
12kN
10kN
8kN
6kN
28kN
26kN
24kN
22kN
20kN
18kN
16kN
14kN
12kN
ROTATIONSPEED：min-1(r.p.m) ROTATIONSPEED：min-1(r.p.m)
ROTATIONSPEED：min-1(r.p.m) ROTATIONSPEED：min-1(r.p.m)
HW-08 HW-10
HW-12 HW-15
30
30
40
42
28
20
20
10
10
60
54
50
40
30
20
10
0
001000
1000 1000 12001500
2000 1000 20003000
GRIPPINGFORCE PERAPAIROFJAWS:kN
GRIPPINGFORCE PERAPAIROFJAWS:kN
GRIPPINGFORCE PERAPAIROFJAWS:kN
GRIPPINGFORCE PERAPAIROFJAWS:kN
INPUTFORCE
PERAPLUNGER
INPUTFORCE
PERAPLUNGER
INPUTFORCE
PERAPLUNGER
INPUTFORCE
PERAPLUNGER
LIMIT
LIMIT
LIMIT
LIMIT
6kN
8kN
10kN
12kN
14kN
16.5kN
6kN
8kN
10kN
12kN
14kN
16kN
18kN
20kN
23kN
42
40
30
20
10
0
DANGER
DANGER
NOTICE
A=B
Fig.5
Tightenatspecified
torque
Standardsoftjaw
Kitagawagripping
forcemeter
GREASELUBURICATION
Allowable
maximum
inputforce
BA
Work
ChuckChuck
G
G
BA
H
r
r

14
13
3.Relationshipbetweengrippingforceandrotationspeed
As the rotation speed becomes higher, the centrifugal force of the jaw increases and the gripping force lowers. The
curves displayed in Fig. 6 shows relationships between the rotation speed and the centrifugal force when using the
standard soft jaw. The centrifugal force differs significantly depending on the size and shape of the top jaw and the
attaching position, therefore, when the rotation speed is high, actual measurement using a Kitagawa gripping force
meterisrequired.
Toavoidseriousaccidentscausedbythechuckorworkflyingout:
・Determinethegrippingforcerequiredforprocessingbythemachinetoolmanufactureroruser,andcheckthat
therequiredgrippingforceisprovidedbeforeprocessing.Thegrippingforceofthechuckmustnotexceedthe
maximumstaticgrippingforce.
・Determinethe rotation speedrequired for processing by themachine tool manufactureror user based on the
gripping force required for the processing. The rotation speed at this point must not exceed the allowable
maximumrotationspeed.
・Whendeterminingthecuttingconditions,refertopages14-16.
・Payattentionsincethegrippingforceisdifferentdependingonthestateoftheoilsupply,greaseinuse,heightof
thejaw,performanceofthepumpandthepressurereducingvalve,pipingstate,etc.
3-2.Relationshipbetweengrippingforceandrotationspeed
1.Maximumstaticgrippingforce
Thestaticgrippingforceisthegrippingforcewhenthechuckisatastop.
Thepowerchuckhasamechanismtoconvertinputforce(pistonthrustforce,drawpipedrawingforce)fromthecylinder
togrippingforce.Therefore,thegrippingforcewhentheallowablemaximuminputforcebecomesthemaximumstatic
grippingforce.
However,thegrippingforceisdifferentdependingonthestateofgreaselubrication,greaseinuse,heightofthejaw,
etc.Themaximumstaticgrippingforcespecifiedinthespecificationisthevalueunderthefollowingconditions:
・The Kitagawa standard soft jaw is used as the
jaw.
・Theattachingboltsofthesoftjawaretightened
atthespecifiedtorque.(Refertopage9)
・The numerical values areobtained with the
Kitagawa grippingforce meter.Thegripping
position ofthegripping force meter is at a
position1/2of the heightof the softjawtop
surface(heightfromthechucksurfacetothetop
surfaceofthejaw).
・CHUCK GREASE PRO is used. (Refer to page
21).
・Avariabledisplacementpumpwiththedischarge
volume of 20 liters/min or more is used as the
hydraulic source.Thepressureis set bythe
pressurecontrolequipmentofthepumpitself,or
the pressure reduction valve equipped
separately.
2.Allowablemaximumrotationspeed
Inthecaseofoutsidediametergripping,whenthechuckisrotated,thegrippingforcelowersduetothecentrifugalforce
ofthetopjaw.Therefore,therotationspeedwhenthedynamicgrippingforce(grippingforceduringrotation)becomes
approximately1/3ofthemaximumstaticgrippingforceissetastheallowablemaximumrotationspeed.Thecentrifugal
forceisdifferentdependingonthemassofthetopjawandthebarycentricpositionaswellastherotationspeed.The
allowablemaximumrotationspeedspecifiedinthespecificationisthevalueunderthefollowingconditions:
・TheKitagawastandardsoftjawisused.
・Gripthegrippingforcemeterinthecenterofthejawstroke,andatthispoint,thesoftjawisattachedattheposition
wheretheperipherysideendofthesoftjawandthechuckperipheryarealmostlinedup.
・ThenumericalvaluesareobtainedbytheKitagawagrippingforcemeter.Thegrippingpositionofthegrippingforce
meterisataposition1/2oftheheightofthesoftjawtopsurface(heightfromthechucksurfacetothetopsurfaceof
thejaw).
・Inthecaseofprocessingaconsiderablyunbalancedwork,lowertherotationspeed.Theworkwillflyoutandthisis
dangerous.
・Vibrationisgeneratedifthereisunbalanceduetotheworkandthejig,etc.Vibrationdecreasesprocessprecision
and shortens the working life of the chuck, even possibly breaking it. Correct the unbalance by using a balance
weight,etc.,orlowertherotationspeedforuse.
・Inthecaseofheavycuttingathighrotationspeed,vibrationiseasilygeneratedinthesamemannerastheunbalance
ofthechuck,therefore,setthecuttingconditionsappropriateforthedynamicgrippingforceandmachinerigidity.
Fig.6
3-3.Relationshipbetweengrippingpartcenterheight,
staticgripingforceandinputforce/
Relationshipbetweentopjawmassmomentandgrippingforceloss
Ifthegrippingpartcenterheightoftheusedtopjaw(dimensionHinFig.7)ishigherthanthegrippingpartcenterheightof
thestandardsoftjaw,alargeloadisappliedtothemasterjaw,Tnut,jawattachingbolts,etc.Topreventthesepartsfrom
beingbroken,itisnecessarytousethemachinebyusingalowerinputforcethantheallowablemaximuminputforce.
Additionally,ifthetopjawislargerandheavier,thecentrifugalforcegeneratedatthetopjawwillincrease.Itisnecessary
toexaminethedynamicgrippingforceconsideringthecentrifugalforceandtousethemachineatarotationspeedthat
canwithstandthecuttingforce.
Fig.7
A=B
G:Centerofmassofthetopjaw
m:Massofthetopjaw
r:Distancefromthecenterofmassofthetopjawtothechuckcenter
H:Grippingcenterheight
23kN
20kN
18kN
16kN
14kN
12kN
10kN
8kN
6kN
28kN
26kN
24kN
22kN
20kN
18kN
16kN
14kN
12kN
ROTATIONSPEED：min-1(r.p.m) ROTATIONSPEED：min-1(r.p.m)
ROTATIONSPEED：min-1(r.p.m) ROTATIONSPEED：min-1(r.p.m)
HW-08 HW-10
HW-12 HW-15
30
30
40
42
28
20
20
10
10
60
54
50
40
30
20
10
0
001000
1000 1000 12001500
2000 1000 20003000
GRIPPINGFORCE PERAPAIROFJAWS:kN
GRIPPINGFORCE PERAPAIROFJAWS:kN
GRIPPINGFORCE PERAPAIROFJAWS:kN
GRIPPINGFORCE PERAPAIROFJAWS:kN
INPUTFORCE
PERAPLUNGER
INPUTFORCE
PERAPLUNGER
INPUTFORCE
PERAPLUNGER
INPUTFORCE
PERAPLUNGER
LIMIT
LIMIT
LIMIT
LIMIT
6kN
8kN
10kN
12kN
14kN
16.5kN
6kN
8kN
10kN
12kN
14kN
16kN
18kN
20kN
23kN
42
40
30
20
10
0
DANGER
DANGER
NOTICE
A=B
Fig.5
Tightenatspecified
torque
Standardsoftjaw
Kitagawagripping
forcemeter
GREASELUBURICATION
Allowable
maximum
inputforce
BA
Work
ChuckChuck
G
G
BA
H
r
r

16
15
・Keeptheheightofthetopjawwithintherangeofthegrippingforcelimittable.(RefertoFig.8)
・Ifatopjawistallerthanthestandardsoftjaw,useitattheinputforce(pistonthrustforce,drawpipedrawing
force)specifiedinthegrippingforcelimittable.Ifitisusedwithoutloweringtheinput,thechuckwillbreakand
thisisdangerousasthechuckandworkwillflyout.
Fig.8
・Ifthechuckisusedwitheitheroneofopposingjawsidled,theinputmustbe1/2.Unlesstheinputisreduced,the
chuckisbroken,causingtheworkpiecetoflyout.
・Ifthechuckisusedwithonepairoftwopairsidled,theworkpiecemustbegrippedwithNo.1andNo.3jaws.Ifit
isgrippedwithNo.2andNo.4jaws,thespecifiedgrippingforceisnotobtained,causingtheworkpiecetoflyout.
Analysisofthegrippingforce,inputforceandrotationspeedusingFig.8iscarriedoutasshownbelow.
・Forexample,inthecaseofHW-08standardsoftjaw(massmoment47.5kg・mm),itcannotexceed3000min-1
(rpm),andthegrippingforcelossduetothecentrifugalforceatthisrotationspeedis18.6kN(approx.1897kgf).
The required static gripping force for the dynamic gripping force (gripping force loss by static gripping force -
centrifugalforce)tobecome1/3ofthestaticgrippingforceis28kN,andtherequiredinputtoobtainthisgripping
forceis16.5kN.However,itisnecessarytouseatthegrippingpartcenterheightH=21mmorless.
・IfthegrippingpartcenterheightHishigh,itisnecessarytolowerthestaticgrippingforce.
・Ifthetopjawmassmomentislarge,therotationspeedneedstobelowered.
・Iftherotationspeedishigh,thegrippingforcelossduetothecentrifugalforcebecomeslarge.Thecentrifugal
forceisproportionaltothesquareoftherotationspeed.
The required static gripping force and input force required at the rotation speed in use are predicted from Fig.8,
however,itcontainsanumberofhypotheticalconditions.Therefore,itisnecessarytoonlyusetheseasreference,and
theprocessingconditionsmustbedeterminedaftertrialcuttingwithoutfail.
DANGER
DANGER
NOTICE
GRIPPINGFORCELOSS PERAPAIROFJAWS :kN
GRIPPINGFORCELOSS PERAPAIROFJAWS :kN
GRIPPINGFORCELOSS PERAPAIROFJAWS :kN
GRIPPINGFORCELOSS PERAPAIROFJAWS :kN
STATICGRIPPINGFORCE PERAPAIROFJAWS :kN
STATICGRIPPINGFORCE PERAPAIROFJAWS :kN
STATICGRIPPINGFORCE PERAPAIROFJAWS :kN
STATICGRIPPINGFORCE PERAPAIROFJAWS :kN
20
10 20 400
16.5kN
14kN
12kN
8kN
6kN
10kN
21
80
39
10
30 28
20
10
0
23kN
20kN
18kN
14kN
12kN
16kN
24
10kN
8kN
6kN
30
40
10
45
42
20 40 60 8085
GRIPPINGCENTERHEIGHTH:mm
GRIPPINGCENTERHEIGHTH:mm
GRIPPINGCENTERHEIGHTH:mm
INPUTFORCE
PERAPLUNGER
GRIPPING
FORCELIMIT
INPUTFORCE
PERAPLUNGER
GRIPPING
FORCELIMIT
STD.SOFTJAW
20
0
28kN
24kN
20kN
12kN
16kN
28
40
60
20 40 60 80 100
53
54
26kN
22kN
18kN
14kN
STD.SOFTJAW
GRIPPING
FORCELIMIT
INPUTFORCE
PERAPLUNGER
HW-10
ｍ×ｒ(kg・mm)
TOPJAWMASSMOMENTPERAJAW
HW-15
ｍ×ｒ(kg・mm)
TOPJAWMASSMOMENTPERAJAW
HW-12
ｍ×ｒ(kg・mm)
TOPJAWMASSMOMENTPERAJAW
20
40
0
23kN
20kN
18kN
14kN
12kN
16kN
24
10kN
8kN
6kN
10 20 40 60 80
45
30
10
42
2000
min
-1
1800min
-1
1400min
-1
1000min
-1
1600
min
-1
1200min
-1
800min
-1
1500min
-1
1400min
-1
1200min
-1
1000min
-1
1300min
-1
1100min
-1
800min
-1
900min
-1
1200min
-1
1000min
-1
1100min
-1
800min
-1
900min
-1
700min
-1
600min
-1
500min
-1
STD.SOFTJAW
STD.SOFTJAW
INPUTFORCE
PERAPLUNGER
STD.SOFTJAW
GRIPPING
FORCELIMIT
STD.SOFTJAW
0 100 200 300
10
20
28
0 100 200 300
10
20
28
0 150 300 450 600 750
10
20
30
36
18.6
10
050 100 150
3000min
-1
2600min
-1
2200
min
-1
1800min
-1
1400min
-1
1000min
-1
STD.SOFTJAW
TOPJAWMASSMOMENTPERAJAW
ｍ×ｒ(kg・mm)
HW-08
GRIPPINGCENTERHEIGHTH:mm
STD.SOFTJAW

16
15
・Keeptheheightofthetopjawwithintherangeofthegrippingforcelimittable.(RefertoFig.8)
・Ifatopjawistallerthanthestandardsoftjaw,useitattheinputforce(pistonthrustforce,drawpipedrawing
force)specifiedinthegrippingforcelimittable.Ifitisusedwithoutloweringtheinput,thechuckwillbreakand
thisisdangerousasthechuckandworkwillflyout.
Fig.8
・Ifthechuckisusedwitheitheroneofopposingjawsidled,theinputmustbe1/2.Unlesstheinputisreduced,the
chuckisbroken,causingtheworkpiecetoflyout.
・Ifthechuckisusedwithonepairoftwopairsidled,theworkpiecemustbegrippedwithNo.1andNo.3jaws.Ifit
isgrippedwithNo.2andNo.4jaws,thespecifiedgrippingforceisnotobtained,causingtheworkpiecetoflyout.
Analysisofthegrippingforce,inputforceandrotationspeedusingFig.8iscarriedoutasshownbelow.
・Forexample,inthecaseofHW-08standardsoftjaw(massmoment47.5kg・mm),itcannotexceed3000min-1
(rpm),andthegrippingforcelossduetothecentrifugalforceatthisrotationspeedis18.6kN(approx.1897kgf).
The required static gripping force for the dynamic gripping force (gripping force loss by static gripping force -
centrifugalforce)tobecome1/3ofthestaticgrippingforceis28kN,andtherequiredinputtoobtainthisgripping
forceis16.5kN.However,itisnecessarytouseatthegrippingpartcenterheightH=21mmorless.
・IfthegrippingpartcenterheightHishigh,itisnecessarytolowerthestaticgrippingforce.
・Ifthetopjawmassmomentislarge,therotationspeedneedstobelowered.
・Iftherotationspeedishigh,thegrippingforcelossduetothecentrifugalforcebecomeslarge.Thecentrifugal
forceisproportionaltothesquareoftherotationspeed.
The required static gripping force and input force required at the rotation speed in use are predicted from Fig.8,
however,itcontainsanumberofhypotheticalconditions.Therefore,itisnecessarytoonlyusetheseasreference,and
theprocessingconditionsmustbedeterminedaftertrialcuttingwithoutfail.
DANGER
DANGER
NOTICE
GRIPPINGFORCELOSS PERAPAIROFJAWS :kN
GRIPPINGFORCELOSS PERAPAIROFJAWS :kN
GRIPPINGFORCELOSS PERAPAIROFJAWS :kN
GRIPPINGFORCELOSS PERAPAIROFJAWS :kN
STATICGRIPPINGFORCE PERAPAIROFJAWS :kN
STATICGRIPPINGFORCE PERAPAIROFJAWS :kN
STATICGRIPPINGFORCE PERAPAIROFJAWS :kN
STATICGRIPPINGFORCE PERAPAIROFJAWS :kN
20
10 20 400
16.5kN
14kN
12kN
8kN
6kN
10kN
21
80
39
10
30 28
20
10
0
23kN
20kN
18kN
14kN
12kN
16kN
24
10kN
8kN
6kN
30
40
10
45
42
20 40 60 8085
GRIPPINGCENTERHEIGHTH:mm
GRIPPINGCENTERHEIGHTH:mm
GRIPPINGCENTERHEIGHTH:mm
INPUTFORCE
PERAPLUNGER
GRIPPING
FORCELIMIT
INPUTFORCE
PERAPLUNGER
GRIPPING
FORCELIMIT
STD.SOFTJAW
20
0
28kN
24kN
20kN
12kN
16kN
28
40
60
20 40 60 80 100
53
54
26kN
22kN
18kN
14kN
STD.SOFTJAW
GRIPPING
FORCELIMIT
INPUTFORCE
PERAPLUNGER
HW-10
ｍ×ｒ(kg・mm)
TOPJAWMASSMOMENTPERAJAW
HW-15
ｍ×ｒ(kg・mm)
TOPJAWMASSMOMENTPERAJAW
HW-12
ｍ×ｒ(kg・mm)
TOPJAWMASSMOMENTPERAJAW
20
40
0
23kN
20kN
18kN
14kN
12kN
16kN
24
10kN
8kN
6kN
10 20 40 60 80
45
30
10
42
2000
min
-1
1800min
-1
1400min
-1
1000min
-1
1600
min
-1
1200min
-1
800min
-1
1500min
-1
1400min
-1
1200min
-1
1000min
-1
1300min
-1
1100min
-1
800min
-1
900min
-1
1200min
-1
1000min
-1
1100min
-1
800min
-1
900min
-1
700min
-1
600min
-1
500min
-1
STD.SOFTJAW
STD.SOFTJAW
INPUTFORCE
PERAPLUNGER
STD.SOFTJAW
GRIPPING
FORCELIMIT
STD.SOFTJAW
0 100 200 300
10
20
28
0 100 200 300
10
20
28
0 150 300 450 600 750
10
20
30
36
18.6
10
050 100 150
3000min
-1
2600min
-1
2200
min
-1
1800min
-1
1400min
-1
1000min
-1
STD.SOFTJAW
TOPJAWMASSMOMENTPERAJAW
ｍ×ｒ(kg・mm)
HW-08
GRIPPINGCENTERHEIGHTH:mm
STD.SOFTJAW

Body Body Body Body
(Incorrect) (Correct)
Ｔnut
Softjaw
Ｔnut
Hardjaw
1
2
3
4
Formingring
Softjaw
Performturningto
setthereference
surfacetothe
circumference
Alignreference
surfaces
Softjaw Cutter
Topjawattachingbolt
Topjaw
Tnut
0〜1mm
Reference
Entirestroke
Masterjaw
Appropriatestroke
1
・UsetheTnutsothatitdoesnotcomeoutfromthemasterjaw.(RefertoFig.9)
・ItiftheTnutcomesoutfromthemasterjaw,themasterjawandTnutwillbreakcausingtheworktoflyoutanda
possibleprecisionfailure.

・Alwaystightentheboltsatthespecifiedtorque.Ifthetorqueisinsufficientorexcessive,theboltwillbreak,which
isdangerousasthechuckorworkwillflyout.
17
18
4-1.Attachmentofsoftjaw
Fig.9
Fig.12-1 Fig.12-2
Fig.13-1Ifagrippingportionisasquare Fig.13-2Ifagrippingportioniseccentric
4.FormingSoftJaw
Table5
Type
HW-08
HW-10
HW-12
HW-15
Differencepermissiblerange(indiameter)
6.0mm
7.5mm
7.5mm
8.0mm
Theattachingpositionofthesoftjawcanbeadjustedbylooseningthesocketheadcapscrew,attachingthesoftjaw
andbychangingeachserrationengagementposition.
Usethemostappropriatesoftjawconsideringtheshape,dimension,material,andsurfaceroughnessoftheworkand
thecuttingconditions,etc.
Thefollowingshowsanexampleofsoftjawformingmethod.
1.Grip the forming ring in the center of jaw stroke as showninFig.12-1, and perform turning of the softjaw
circumferencetoattainthereferencesurfaces.
2.If a gripped portion of workpiece is a square, remove the soft jaws and align the reference surfaces as shown in
Fig.12-2,andformthegrippingportionswithacutter.
3.Ifagrippingportionofworkpieceisarectangleoreccentric,formallsoftjawstogether,andthenmodifythesoftjawin
eccentricdirection,meetingtheworkpiece.Forexample,inthecaseofworkpieceasshowninFig.13-2,formallsoft
jawstothesizeA,andthenmodifyonlytheNo.4jawtothesizeB.
4-2.Formingsoftjaw
Whengrippingtheworkpiecebythischuck,basicallygripitwith2pairsofjawsinthesamestrokeposition.However,if
theworkpiece dimensionaltolerance varies largely or if the workpieceis grippedintentionally with2 pairsof jawsin
different stroke positions, the amount of stroke between 2 pairs of jaws is different. This is called the amount of
differenceinjawstroke.
Because of the chuck structural reason, the amount of difference is restricted. Use the amount of difference inthe
differencepermissiblerangeshowninTable5.
4-3.Differencepermissiblerange
InuseofKitagawaYWcylinder,whichoneoftwopairsofjawsoperatesfirstisnotdefiniteduetotheslidingresistance
variations in each section. To make definite the operating sequence of 2 pairs of jaws, special cylinder is required.
Pleasemakeaninquiry.
4-4.Operatingsequenceof2pairsofjaws
・Do not use the chuck exceedingthedifference permissible range ofjawstrokes. Grippingtheworkpiece
exceedingthedifferencepermissiblerangebreaksthechuckorresultsinaworkpiecegrippingfailure,causing
theworkpiecetobedamagedortoflyout.
1
2
3
4
2
1
3
4
AAB
DANGER
DANGER
・Ifthescrew-indepthofthejawattachingbolttotheTnutisshallow,theT
nutwillbreak,andthisisdangerousasthejawandworkwillflyout.Ifthe
attachingboltistoolongandcomesoutfromthebottomoftheTnutas
well,thisisdangerousasthejawandworkwillflyoutsincethetopjawis
notfixed.Therefore, theoveralllength ofthejaw attachingboltmust be
approximately0to-1mmfromthebottomoftheTnut(RefertoFig.10).
・Usethe Tnut andthe attachingbolts attached to the chuckand donot
useboltsotherthanthese.Ifcommerciallyavailableboltsareusedforan
unavoidablereason,useboltsatthestrengthclassification12.9(strength
classification10.9forM22ormore)ormore,andpaysufficientattentionto
thelength.
・DonotrotatethechucksothattheTnutisloosenedcausingthejawtofly
out.
・CheckthatthereferencemarkonthesideoftheNo.1andNo.2masterjawsarewithintherangeoftheentire
strokeasshownin Fig.11.Fullstroke the jawatleastonce a daytocheckit beforeworkorwhensupplying
grease,etc.Ifitgoesoutoftherangeofappropriatestrokeduetolooseningofthedrawnut,etc.,theworkmay
notbegripped,andthisisdangerousastheworkwillflyout.
・Whengrippingthework,useitbykeepingthepositionofthemasterjaw
withintheappropriatestrokerange.Grippinginthecenterofthestrokeis
the most stable for the mechanism, and the best precision can be ob-
tained.
・Whengrippingnearthestrokeend,theworkmaynotbegrippedsome-
timesaccordingtothedeviation,etc.,ofthegrippingpartallowanceof
thework,andthisisdangerousastheworkwillflyout.
・Whengrippingnearthestrokeend,thechuckmaybreakandthechuck
orworkcouldflyout.
Fig.10
Fig.11
DANGER
Table4
Appropriatestrokerange（mm） 4.0 5.0 5.0 5.0
Type HW-08 HW-10 HW-12 HW-15
Table3
Boltsize Tighteningtorque
M5
M6
M8
7.5N・m
13N・m
33N・m
Boltsize Tighteningtorque
M10
M12
M14
73N・m
107N・m
171N・m
Boltsize Tighteningtorque
M16
M20
250N・m
402N・m

Body Body Body Body
(Incorrect) (Correct)
Ｔnut
Softjaw
Ｔnut
Hardjaw
1
2
3
4
Formingring
Softjaw
Performturningto
setthereference
surfacetothe
circumference
Alignreference
surfaces
Softjaw Cutter
Topjawattachingbolt
Topjaw
Tnut
0〜1mm
Reference
Entirestroke
Masterjaw
Appropriatestroke
1
・UsetheTnutsothatitdoesnotcomeoutfromthemasterjaw.(RefertoFig.9)
・ItiftheTnutcomesoutfromthemasterjaw,themasterjawandTnutwillbreakcausingtheworktoflyoutanda
possibleprecisionfailure.

・Alwaystightentheboltsatthespecifiedtorque.Ifthetorqueisinsufficientorexcessive,theboltwillbreak,which
isdangerousasthechuckorworkwillflyout.
17
18
4-1.Attachmentofsoftjaw
Fig.9
Fig.12-1 Fig.12-2
Fig.13-1Ifagrippingportionisasquare Fig.13-2Ifagrippingportioniseccentric
4.FormingSoftJaw
Table5
Type
HW-08
HW-10
HW-12
HW-15
Differencepermissiblerange(indiameter)
6.0mm
7.5mm
7.5mm
8.0mm
Theattachingpositionofthesoftjawcanbeadjustedbylooseningthesocketheadcapscrew,attachingthesoftjaw
andbychangingeachserrationengagementposition.
Usethemostappropriatesoftjawconsideringtheshape,dimension,material,andsurfaceroughnessoftheworkand
thecuttingconditions,etc.
Thefollowingshowsanexampleofsoftjawformingmethod.
1.Grip the forming ring in the center of jaw stroke as showninFig.12-1, and perform turning of the softjaw
circumferencetoattainthereferencesurfaces.
2.If a gripped portion of workpiece is a square, remove the soft jaws and align the reference surfaces as shown in
Fig.12-2,andformthegrippingportionswithacutter.
3.Ifagrippingportionofworkpieceisarectangleoreccentric,formallsoftjawstogether,andthenmodifythesoftjawin
eccentricdirection,meetingtheworkpiece.Forexample,inthecaseofworkpieceasshowninFig.13-2,formallsoft
jawstothesizeA,andthenmodifyonlytheNo.4jawtothesizeB.
4-2.Formingsoftjaw
Whengrippingtheworkpiecebythischuck,basicallygripitwith2pairsofjawsinthesamestrokeposition.However,if
theworkpiece dimensionaltolerance varies largely or if the workpieceis grippedintentionally with2 pairsof jawsin
different stroke positions, the amount of stroke between 2 pairs of jaws is different. This is called the amount of
differenceinjawstroke.
Because of the chuck structural reason, the amount of difference is restricted. Use the amount of difference inthe
differencepermissiblerangeshowninTable5.
4-3.Differencepermissiblerange
InuseofKitagawaYWcylinder,whichoneoftwopairsofjawsoperatesfirstisnotdefiniteduetotheslidingresistance
variations in each section. To make definite the operating sequence of 2 pairs of jaws, special cylinder is required.
Pleasemakeaninquiry.
4-4.Operatingsequenceof2pairsofjaws
・Do not use the chuck exceedingthedifference permissible range ofjawstrokes. Grippingtheworkpiece
exceedingthedifferencepermissiblerangebreaksthechuckorresultsinaworkpiecegrippingfailure,causing
theworkpiecetobedamagedortoflyout.
1
2
3
4
2
1
3
4
AAB
DANGER
DANGER
・Ifthescrew-indepthofthejawattachingbolttotheTnutisshallow,theT
nutwillbreak,andthisisdangerousasthejawandworkwillflyout.Ifthe
attachingboltistoolongandcomesoutfromthebottomoftheTnutas
well,thisisdangerousasthejawandworkwillflyoutsincethetopjawis
notfixed.Therefore, theoveralllength ofthejaw attachingboltmust be
approximately0to-1mmfromthebottomoftheTnut(RefertoFig.10).
・Usethe Tnut andthe attachingbolts attached to the chuckand donot
useboltsotherthanthese.Ifcommerciallyavailableboltsareusedforan
unavoidablereason,useboltsatthestrengthclassification12.9(strength
classification10.9forM22ormore)ormore,andpaysufficientattentionto
thelength.
・DonotrotatethechucksothattheTnutisloosenedcausingthejawtofly
out.
・CheckthatthereferencemarkonthesideoftheNo.1andNo.2masterjawsarewithintherangeoftheentire
strokeasshownin Fig.11.Fullstroke the jawatleastonce a daytocheckit beforeworkorwhensupplying
grease,etc.Ifitgoesoutoftherangeofappropriatestrokeduetolooseningofthedrawnut,etc.,theworkmay
notbegripped,andthisisdangerousastheworkwillflyout.
・Whengrippingthework,useitbykeepingthepositionofthemasterjaw
withintheappropriatestrokerange.Grippinginthecenterofthestrokeis
the most stable for the mechanism, and the best precision can be ob-
tained.
・Whengrippingnearthestrokeend,theworkmaynotbegrippedsome-
timesaccordingtothedeviation,etc.,ofthegrippingpartallowanceof
thework,andthisisdangerousastheworkwillflyout.
・Whengrippingnearthestrokeend,thechuckmaybreakandthechuck
orworkcouldflyout.
Fig.10
Fig.11
DANGER
Table4
Appropriatestrokerange（mm） 4.0 5.0 5.0 5.0
Type HW-08 HW-10 HW-12 HW-15
Table3
Boltsize Tighteningtorque
M5
M6
M8
7.5N・m
13N・m
33N・m
Boltsize Tighteningtorque
M10
M12
M14
73N・m
107N・m
171N・m
Boltsize Tighteningtorque
M16
M20
250N・m
402N・m

Shadedpartadditionalprocess
possiblerange
CA
B
・Whengrippingaworkwiththechuck,donotgetfingersorhandsbecomecaught.Thiscouldcausecrushedor
cutfingersandhands.
19
20
Thisproductisadevicetofixawork-piecewhenitisprocessedbythelathemachineortherotarytable.
Therotarycylinderclosesthejawandfixesawork-piecesothatitdoesnotmoveduringprocessing.Thechuckopens
thejawafterhavingprocesseditandremoveawork-piece.
5-1.Precautionsduringgrippingworkwithchuck
5-2.Precautionsduringgrippingworkinirregularshape
5.Usage
・Ifaworkinanirregularshapeisgrippedthemasterjawmaybebroken.Consultourcompanyorthedistributorif
thereisanyconcern.
・Castmetal,pitchedshapeortapershapecannotbegripped.
・Iftheprotrusionoftheworkislong,supportitwithacenterorthesteadyrest.Iftheprotrusionislongthetipof
theworkturns,andthisisdangerousastheworkwillflyout.
5-3.Precautionsrelatedtousageofjaw
・IfasoftjawotherthanonemadebyKitagawaCorporatinisused,theengagementwillbeinferior,andthemaster
jawwillbedeformed,thegrippingprecisionwillworsen,andtheworkwillflyoutduetogrippingfailure,whichis
dangerous.
・Donotuseatopjawwithadifferentserrationpitchfromthemasterjaw.Theengagementofthecrestsofthe
serrationwill becomeinsufficient, therefore,the serrationcrests will break when grippingthe work,and thisis
dangerousasthejawandworkwillflyout.
・Donotusethesoftjawbyweldingtojoinforextension.Thejawwillbreakduetoinsufficientstrengthandthe
serrationpartwillbecomedistortedduetowelding.Asaresult,theengagementwillworsen,theserrationcrests
willbreak,andthisisdangerousastheworkwillflyout.
・Whenreplacingthetopjaw,carefullycleantheserrationpartwiththemasterjaw,andtheengagementpartof
theTnut.Failuretodothismaycauseaprecisionfailure.
・Setthehydraulicpressureaccordingtotheshapeoftheworkandthecuttingconditions.Pipeshapework,etc.,
maybedistortediftheyaretightenedatahighgrippingforce.
A,B:Additionalprocessimpossibledimension. C:Processibledepthoftappingordrillingahole.
<1>Unbalance
・In the case of processing largely unbalanced work, lower the rotation speed. The work will fly out and this is
dangerous.
・Vibrationsaregeneratedifthereisunbalanceowingtotheworkorthejig,etc.Vibrationnotonlywillimparta
negativeinfluence ontheprocess precisionbut also theendurance ofthe chuck beingremarkably shortened,
andthechuckmaybreak.Correcttheunbalanceusingbalanceweights,etc.,orlowertherotationspeedforuse.
・Heavy cutting at high rotation speed easily generates vibration in the same manner as chuck unbalance,
therefore,setcuttingconditionsappropriateforthedynamicgrippingforceandmachinerigidity.
<2>Interference,contact,impact
・Before starting work, check that the top jaw, locator, work, etc., and the tool and the tool post, etc., do not
interfereatlowrotationandthenstartprocessing.
・Donotallowanythingtoimpactthechuck,jaw,andthework.Thechuckwillbreakandthisisdangerousasthe
chuckandworkwillflyout.
・Ifthetoolandthetoolpostcontactthechuckortheworkduetomalfunctionortapemistake,etc.,andimpactis
given,immediatelystoptherotation,andcheckthattherearenoabnormalitiesinthetopjaw,masterjaw,Tnut
andboltsofeachpart,etc.
<3>Coolant
・Unlesscoolantwitharustpreventiveeffectisused,rustwilloccurinsidethechuckandgrippingforcedropmay
result.Theworkwillflyoutduetothegrippingforcedropandthisisdangerous.
5-4.Precautionsrelatedtoprocessing
5-5.Attachmentoflocatorandjig
・Thechuckcanbemodifiedonlyinthemanufacturerpermissiblerange.Thiswillnotonlybreakthechuckbutthe
chuckandworkmayflyout,whichisdangerous.
・Provideacountermeasureagainstflyingout(dwellpin,etc.)duetocentrifugalforcetothelocatororthejig,and
attachwithboltswhichhavesufficientstrength.Thelocatororthejigmayflyout,andthisisdangerous.
・Inthecaseofattachingthelocatorandthejigonthechuckbodysurface,tapordrillaholeintheadditionalprocess
rangespecifiedinFig.14.
Type
HW-08
HW-10
HW-12
HW-15
A(mm)
32
35
35
45
B(mm)
60
70
70
90
C(mm)
18orless
18orless
18orless
18orless
Fig.14
Table6
DANGER
DANGER
DANGER
DANGER
DANGER
NOTICE