Kitagawa BL200 Series User manual

LargeThru-HoleLongStroke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
BL200/BLT200
type
Version 1.12 (2021.08.03)
Original instructions
DANGER
77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan
Te l .[phone]
Fax.[phone]
KitagawaCorporation
G2021.08.1000
■ 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]
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]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Fax.[phone]
Fax.[phone]
Fax.[phone]
Fax.[phone]
Fax.[phone]
Fax.[phone]
Fax.[phone]
https://www.kitagawa.com.cn
https://www.kiw.co.jp
https://www.kitagawa.com
KITAGAWA-NORTHTECH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.
Tel.[phone]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Tel.[phone]
Fax.[phone]
Fax.[phone]
Fax.[phone]
Fax.[phone]
Fax.[phone]
Fax.[phone]
Fax.[phone]
Fax.[phone]
Fax.[phone]
AmericaContact
EuropeContact
AsiaContact
OceaniaContact
https://www.kitagawa-usa.com
https://www.kitagawa.global/en
https://www.kitagawa.global/de
https://www.kitagawa.global/pl
https://www.kitagawa.global/cz
https://www.kitagawa.global/ro
https://www.kitagawa.global/hu
https://www.kitagawa.global/in
https://www.kitagawa.com.cn
http://www.deamark.com.tw
http://www.kitagawa.co.kr
https://www.dimac.com.au

1
2
Thismanualprovidesdetailedinformationabouthowtosafelyandcorrectlyusethepowerchuck(BL200/BLT200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 Corporation 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Corporation.
Additionally,ifpartsotherthangenuinepartsmanufacturedbyKitagawaCorporationareused,thisguaranteewillbe
completelyinvalid.
The chuck and cylinder from Kitagawa Corporation 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withoutsidediametergripping
4-3.Formingsoftjawwithinsidediametergripping
4-4.Formingmethodwhenyouuseformingjig
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.Inthecasethatthebackplatemustbemanufactured(BL200、BLT200series)
8-3.Inthecaseofwithbackplate(BL200Aseries)
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
……………………………………………………………………………… 18
…………………………………………………………………………………………… 22
………………………………………………………………… 24
…………………………………………………………… 26
……………………………………………………………………………………… 27
……………………………………………………………………………… 33

1
2
Thismanualprovidesdetailedinformationabouthowtosafelyandcorrectlyusethepowerchuck(BL200/BLT200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 Corporation 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Corporation.
Additionally,ifpartsotherthangenuinepartsmanufacturedbyKitagawaCorporationareused,thisguaranteewillbe
completelyinvalid.
The chuck and cylinder from Kitagawa Corporation 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withoutsidediametergripping
4-3.Formingsoftjawwithinsidediametergripping
4-4.Formingmethodwhenyouuseformingjig
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.Inthecasethatthebackplatemustbemanufactured(BL200、BLT200series)
8-3.Inthecaseofwithbackplate(BL200Aseries)
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
……………………………………………………………………………… 18
…………………………………………………………………………………………… 22
………………………………………………………………… 24
…………………………………………………………… 26
……………………………………………………………………………………… 27
……………………………………………………………………………… 33

Body
Masterjaw Topjaw
Stoppper
Drawnut
Cover
Tnut
Plungernut
（Softjaw.hardjaw.
specialjawincluded）
Cylinder Chuck
Drainhose Flexiblehose
Solenoid
valve
LineFilter
Tank
Pressureadjusting
screw
Hydraulic
pump
Pressure
gauge
Manualswitching
valve
Lever
Leverpin
Attachingbolt
Backplate
Plunger
BLT200type
BL200type
SOL.
3
4
Typedisplayasshownbelow
Thisinstructionmanualisforthechuckpart.
1 − 1 Typedisplay
1 − 3 Scopeofproduct
1 − 2 Structuraldrawing
Fig.1
Fig.3
Fig.2
1.StructuralDrawingandPartsList
・To prevent the work from flying, safe design, maintenance and erroneous action prevention of the hydraulic
system 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.
WARNING
BL2 06 A5 999
Attachmentshape
Straightspigotjoint：−
A2−5
 ：A5
A2−6 ：A6
A2−8 ：A8
A2−11
 ：A1
A2−15（
FormerJIS ）：C5
A2−15（NewJIS）：K5
DesignNo.
BL200series（3JAW）
（inch）
Chucknominaldiameter
BLT2 06 5 999
Attachmentshape
Straightspigotjoint：−
A2−5 ：5
A2−6 ：6
A2−8 ：8
A2−11 ：1
DesignNo.
BLT200series（2JAW）
（inch）
Chucknominaldiameter

Body
Masterjaw Topjaw
Stoppper
Drawnut
Cover
Tnut
Plungernut
（Softjaw.hardjaw.
specialjawincluded）
Cylinder Chuck
Drainhose Flexiblehose
Solenoid
valve
LineFilter
Tank
Pressureadjusting
screw
Hydraulic
pump
Pressure
gauge
Manualswitching
valve
Lever
Leverpin
Attachingbolt
Backplate
Plunger
BLT200type
BL200type
SOL.
3
4
Typedisplayasshownbelow
Thisinstructionmanualisforthechuckpart.
1 − 1 Typedisplay
1 − 3 Scopeofproduct
1 − 2 Structuraldrawing
Fig.1
Fig.3
Fig.2
1.StructuralDrawingandPartsList
・To prevent the work from flying, safe design, maintenance and erroneous action prevention of the hydraulic
system 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.
WARNING
BL2 06 A5 999
Attachmentshape
Straightspigotjoint：−
A2−5
 ：A5
A2−6 ：A6
A2−8 ：A8
A2−11
 ：A1
A2−15（
FormerJIS ）：C5
A2−15（NewJIS）：K5
DesignNo.
BL200series（3JAW）
（inch）
Chucknominaldiameter
BLT2 06 5 999
Attachmentshape
Straightspigotjoint：−
A2−5 ：5
A2−6 ：6
A2−8 ：8
A2−11 ：1
DesignNo.
BLT200series（2JAW）
（inch）
Chucknominaldiameter

10
30
19 23 22576151 14 18
29 22 16 11 20 21 3417
12 813
24 95
5
6
Important safety precautions are summarized below. Please read this section before first
startingtousethisproduct.
1 − 4 Partslist
2. ImportantSafetyPrecautions
Fig.4
Table1
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
Turnoffmainpowersupplybeforeattaching,inspectingorreplacingchuck,
andbeforeaddingoil. ForAllUsers
・Thechuck may start rotation suddenly,
andapartofthebodyorclothingmaybe
caught.
Closedoorbeforerotatingspindle. ForAllUsers
・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. ForAllUsers
・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
switching valve or solenoid
valve willlead to a dropof
hydraulicpressure.
29,30areonlysuppliedifthereisabackplate.
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
No.
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Quantity
1
1
2or3
2or3
2or3
1
1
1
2or3
2or3
2or3
4or6
1
3or4
2
Partname Partname
Body
Plunger
Masterjaw
Softjaw
Tnut
Plungernut
Drawnut
Cover
Lever
LeverPin
Stopper
Spacer
Handle
Socketheadbuttonscrew
Plungernutlockingbolt
Socketheadcapscrew
Jawattachingbolt
Chuckattachingbolt
Setscrew
Setscrew
Setscrew
Parallelpin
Leadball
GreaseNipple
Ballplunger
Hexkey
Hexkey
Hexkey
Backplate
Socketheadcapscrew
Quantity
4or6
4or6
3or4
1
2or3
2or3
1
1
2or3
1
1
1
1
1
3or4
Lathe
Close
Work
Manualswitchingvalve
Solenoidvalve
Jaw
closed
Jaw
open
NO
Lathe
OFF
OFF
ON
Mainpowersupply
OFF
ON

10
30
19 23 22576151 14 18
29 22 16 11 20 21 3417
12 813
24 95
5
6
Important safety precautions are summarized below. Please read this section before first
startingtousethisproduct.
1 − 4 Partslist
2. ImportantSafetyPrecautions
Fig.4
Table1
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
Turnoffmainpowersupplybeforeattaching,inspectingorreplacingchuck,
andbeforeaddingoil. ForAllUsers
・Thechuck may start rotation suddenly,
andapartofthebodyorclothingmaybe
caught.
Closedoorbeforerotatingspindle. ForAllUsers
・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. ForAllUsers
・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
switching valve or solenoid
valve willlead to a dropof
hydraulicpressure.
29,30areonlysuppliedifthereisabackplate.
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
No.
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Quantity
1
1
2or3
2or3
2or3
1
1
1
2or3
2or3
2or3
4or6
1
3or4
2
Partname Partname
Body
Plunger
Masterjaw
Softjaw
Tnut
Plungernut
Drawnut
Cover
Lever
LeverPin
Stopper
Spacer
Handle
Socketheadbuttonscrew
Plungernutlockingbolt
Socketheadcapscrew
Jawattachingbolt
Chuckattachingbolt
Setscrew
Setscrew
Setscrew
Parallelpin
Leadball
GreaseNipple
Ballplunger
Hexkey
Hexkey
Hexkey
Backplate
Socketheadcapscrew
Quantity
4or6
4or6
3or4
1
2or3
2or3
1
1
2or3
1
1
1
1
1
3or4
Lathe
Close
Work
Manualswitchingvalve
Solenoidvalve
Jaw
closed
Jaw
open
NO
Lathe
OFF
OFF
ON
Mainpowersupply
OFF
ON

7
8
ImportantSafetyPrecautions
Donotallowtherotationspeedofthechucktoexceedthemaximumallowable
speedlimit.(Refertopages13-17) ForAllUsers
・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13-17) ForAllUsers
・Input must match the specification of
thechuck.
・Adjust the hydraulic pressure to the
cylindersothattheinputforce,which
determines the gripping force of the
chuck,doesnotexceed.
・Excessive input force can lead to
breakage of the chuck, which is very
dangerous, as the chuck can work
canbedamagedandflyout.
Ifyouusethechuckwiththeinsidediametergripping,inputforce(hydraulic
pressure)mustbe1/2orlessoftheallowablemaximuminput.
(Refertopage17) ForAllUsers
・The chuck may break and the chuck
orworkcouldflyout.
Keeptheheightofthejawwithintherangespecifiedinthegrippingforcelimittable(Refertopage15-17).
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.
ForAllUsers
・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.
ForAllUsers
・Iftheprotrusionislong,thetipoftheworkcanturnandtheworkflyout.
ForAllUsers
・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.
Whentheprotrusionoftheworkislong,supportitwith
thesteadyrestorcenter.
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13-17andcylindermanual)
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
Work
Flyout
Steadyrest Center
Tailstock
DOWN
Work
Specialtopjawheight
Standardsoft
jawheight
Lowerthehydraulic
pressurewhenusing
atalljaw
DOWN
Inputforce(hydraulicpressure)
tobe1/2orless
Flyout
Work
Chuck
Cylinder
Drawpipe
Allowablemaximum
inputforceorless
Flyout
Work
PRESSURE
GAUGE
PRESSURE
GAUGE

7
8
ImportantSafetyPrecautions
Donotallowtherotationspeedofthechucktoexceedthemaximumallowable
speedlimit.(Refertopages13-17) ForAllUsers
・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13-17) ForAllUsers
・Input must match the specification of
thechuck.
・Adjust the hydraulic pressure to the
cylindersothattheinputforce,which
determines the gripping force of the
chuck,doesnotexceed.
・Excessive input force can lead to
breakage of the chuck, which is very
dangerous, as the chuck can work
canbedamagedandflyout.
Ifyouusethechuckwiththeinsidediametergripping,inputforce(hydraulic
pressure)mustbe1/2orlessoftheallowablemaximuminput.
(Refertopage17) ForAllUsers
・The chuck may break and the chuck
orworkcouldflyout.
Keeptheheightofthejawwithintherangespecifiedinthegrippingforcelimittable(Refertopage15-17).
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.
ForAllUsers
・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.
ForAllUsers
・Iftheprotrusionislong,thetipoftheworkcanturnandtheworkflyout.
ForAllUsers
・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.
Whentheprotrusionoftheworkislong,supportitwith
thesteadyrestorcenter.
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13-17andcylindermanual)
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
Work
Flyout
Steadyrest Center
Tailstock
DOWN
Work
Specialtopjawheight
Standardsoft
jawheight
Lowerthehydraulic
pressurewhenusing
atalljaw
DOWN
Inputforce(hydraulicpressure)
tobe1/2orless
Flyout
Work
Chuck
Cylinder
Drawpipe
Allowablemaximum
inputforceorless
Flyout
Work
PRESSURE
GAUGE
PRESSURE
GAUGE

9
10
10
Providesufficientstrengthforthedrawpipe(Refertopages28-30).
Providesufficientscrewdepthforthedrawpipe.
Firmlytightenthedrawpipe.
ForMachineToolManufactures
・If the draw pipe break, the gripping force is
instantlylostandthisisdangerousasworkwill
flyout.
・If the screwdepth of thedrawpipe is
insufficient, the screwwill break and the
grippingforcewillbelostinstantly,andthisis
dangerousasworkwillflyout.
・If the engagement of the screw of the draw
pipe is loose, vibration may occur resulting in
breakageofthescrew.Ifthescrewbreaks,the
gripping force will be lost instantly, which is
dangerousastheworkwillflyout.
・Ifthedraw pipe isunbalanced, vibration
occurs, the screw is broken and the gripping
forcewillbelostinstantly,whichisdangerous
astheworkwillflyout.
・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.
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.
ImportantSafetyPrecautions
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
ForMachineToolManufactures
・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torque
control.
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. ForAllUsers
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
・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.
・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.
ForAllUsers
Inthecaseofprocessingasignificantunbalancedwork,
lowertherotationspeed.
・Unbalanced work generates dangerous
centrifugal forces and the work could fly
out.
ForAllUsers
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.
Cylinder
Backplate
Chuck
Drawpipe
Solenoidvalve
Thegrlippingposition
mustberetained.
Loosening
Lightning
＝Blackout
Lockvalve
Cylinder
Gripping
P
Cylinderadapter
L＝0.1（m）
Boltsize Tighteningtorque
M4
M5
M6
M8
M10
M12
M14
M16
3.8N・m
7.5N・m
13N・m
33N・m
73N・m
107N・m
171N・m
250N・m
Boltsize Tighteningtorque
M4
M5
5.0N・m
10.0N・m
・Tighteningtorqueismomentofforcewhenyoutightenabolt.
Tighteningtorque=F×L.
Chuck
Plungernut
lockingbolt
Plungernut
Work
Chuck
Cylinder
Flyout
Flyout
Unbalancedwork
Tighteningtorque
T＝F×L
＝127×0.1
＝12.7（N・m）
F＝127（N）
（13kgf）
Specifiedtorqueforsocket
headcapscrew
Tighteningtorqueforplungernut
lockingbolt

9
10
10
Providesufficientstrengthforthedrawpipe(Refertopages28-30).
Providesufficientscrewdepthforthedrawpipe.
Firmlytightenthedrawpipe.
ForMachineToolManufactures
・If the draw pipe break, the gripping force is
instantlylostandthisisdangerousasworkwill
flyout.
・If the screwdepth of thedrawpipe is
insufficient, the screwwill break and the
grippingforcewillbelostinstantly,andthisis
dangerousasworkwillflyout.
・If the engagement of the screw of the draw
pipe is loose, vibration may occur resulting in
breakageofthescrew.Ifthescrewbreaks,the
gripping force will be lost instantly, which is
dangerousastheworkwillflyout.
・Ifthedraw pipe isunbalanced, vibration
occurs, the screw is broken and the gripping
forcewillbelostinstantly,whichisdangerous
astheworkwillflyout.
・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.
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.
ImportantSafetyPrecautions
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
ForMachineToolManufactures
・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torque
control.
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. ForAllUsers
Failuretofollowthesafetyprecautionsbelowwillresultin
seriousinjuryordeath.
DANGER
・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.
・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.
ForAllUsers
Inthecaseofprocessingasignificantunbalancedwork,
lowertherotationspeed.
・Unbalanced work generates dangerous
centrifugal forces and the work could fly
out.
ForAllUsers
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.
Cylinder
Backplate
Chuck
Drawpipe
Solenoidvalve
Thegrlippingposition
mustberetained.
Loosening
Lightning
＝Blackout
Lockvalve
Cylinder
Gripping
P
Cylinderadapter
L＝0.1（m）
Boltsize Tighteningtorque
M4
M5
M6
M8
M10
M12
M14
M16
3.8N・m
7.5N・m
13N・m
33N・m
73N・m
107N・m
171N・m
250N・m
Boltsize Tighteningtorque
M4
M5
5.0N・m
10.0N・m
・Tighteningtorqueismomentofforcewhenyoutightenabolt.
Tighteningtorque=F×L.
Chuck
Plungernut
lockingbolt
Plungernut
Work
Chuck
Cylinder
Flyout
Flyout
Unbalancedwork
Tighteningtorque
T＝F×L
＝127×0.1
＝12.7（N・m）
F＝127（N）
（13kgf）
Specifiedtorqueforsocket
headcapscrew
Tighteningtorqueforplungernut
lockingbolt

Table2
G6.3
−20〜＋50℃/−10〜＋40℃
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.
Table3
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.
12
Donotoperatethemachinewearinggloves,
anecktie,andotherloose
clothingorjewelry.
ImportantSafetyPrecautions
Failuretofollowthesafetyprecautionsbelowcouldresultin
seriousinjuryordeath.
WARNING
Donotmodifythechuckinawaynotpermitted
bythemanufacturer. ForAllUsers
・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23).
Periodicallysupplyadequategrease(Refertopage24).Turnoffpowerbefore
addinggrease. ForAllUsers
・Insufficient grease supply lowers the
grippingforce,causesoperationfailuredue
to lower hydraulic pressure, lowers the
gripping precision, and causes abnormal
wearingandseizing,etc.
・Thisisdangerousastheworkcouldflyout
fromadropinthegrippingforce.
Donotoperatethemachineafter
drinkingalcoholor
takingmedication.
ForAllUsersForAllUsers
・Dangeroussince
theseleadto
operationmistakes
andmisjudgment.
Donotgripachuckwithachuck. ForAllUsers
・Because it is easy to confuse the specifications of
each chuck and the protrusion become long and is
apt to raise rotation speed, it is apt to exceed the
specifications of the base chuck. The chuck may
breakandthechuckorworkcouldflyout.
11
3 − 1 Specifications
3.Specifications
Type BL206 BL208 BL210 BL212
Plungerstroke
Jawstroke（indiameter）
Allowablemaximuminputforce
Maximumstaticgrippingforce
Allowablemaximumrotation
speed
Thru-holediameter
Standardsoftjawheight
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
kN
(kgf)
kN
(kgf)
min-1

mm
mm
mm
kg
kg・m2
MPa
(kgf／cm2)
25
35
69.3
(7067)
80.4
(8199)
2200
63
52
φ36〜304
78
0.918
S2091
3.22
(32.8)
22
30
53.8
(5486)
63.0
(6424)
3000
53
43
φ33〜254
45
0.306
S1875
3.20
(32.6)
19
25
41.1
(4191)
49.0
(4997)
3300
45
39
φ26〜215
25
0.198
S1552
2.99
(30.5)
15
20
27.9
(2845)
31.2
(3182)
4500
28
29
φ24〜165
14
0.043
S1246
3.40
(34.7)
Plungerstroke
Jawstroke（indiameter）
Allowablemaximuminputforce
Maximumstaticgrippingforce
Allowablemaximumrotation
speed
Thru-holediameter
Standardsoftjawheight
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
kN
(kgf)
kN
(kgf)
min-1
mm
mm
mm
kg
kg・m2
MPa
(kgf／cm2)
Type BLT206 BLT208 BLT210 BLT212
25
35
46.2
(4711)
53.6
(5465)
2200
63
52
φ44〜304
75.5
0.903
S2091
2.22
(22.6)
22
30
35.9
(3661)
42.0
(4283)
3000
53
43
φ40〜254
43.5
0.290
S1875
2.20
(22.4)
19
25
27.4
(2794)
32.7
(3334)
3300
45
39
φ32〜215
24
0.193
S1552
2.08
(21.2)
15
20
18.6
(1897)
20.8
(2121)
4500
28
29
φ24〜165
13.5
0.042
S1246
2.36
(24.1)
G6.3
−20〜＋50℃/−10〜＋40℃
・BL200type
・BLT200type
・Dangeroussinceitwill
becaught.
Alcohol
Greasegun
Greasenipple
NO
Medication

Table2
G6.3
−20〜＋50℃/−10〜＋40℃
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.
Table3
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.
12
Donotoperatethemachinewearinggloves,
anecktie,andotherloose
clothingorjewelry.
ImportantSafetyPrecautions
Failuretofollowthesafetyprecautionsbelowcouldresultin
seriousinjuryordeath.
WARNING
Donotmodifythechuckinawaynotpermitted
bythemanufacturer. ForAllUsers
・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23).
Periodicallysupplyadequategrease(Refertopage24).Turnoffpowerbefore
addinggrease. ForAllUsers
・Insufficient grease supply lowers the
grippingforce,causesoperationfailuredue
to lower hydraulic pressure, lowers the
gripping precision, and causes abnormal
wearingandseizing,etc.
・Thisisdangerousastheworkcouldflyout
fromadropinthegrippingforce.
Donotoperatethemachineafter
drinkingalcoholor
takingmedication.
ForAllUsersForAllUsers
・Dangeroussince
theseleadto
operationmistakes
andmisjudgment.
Donotgripachuckwithachuck. ForAllUsers
・Because it is easy to confuse the specifications of
each chuck and the protrusion become long and is
apt to raise rotation speed, it is apt to exceed the
specifications of the base chuck. The chuck may
breakandthechuckorworkcouldflyout.
11
3 − 1 Specifications
3.Specifications
Type BL206 BL208 BL210 BL212
Plungerstroke
Jawstroke（indiameter）
Allowablemaximuminputforce
Maximumstaticgrippingforce
Allowablemaximumrotation
speed
Thru-holediameter
Standardsoftjawheight
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
kN
(kgf)
kN
(kgf)
min-1

mm
mm
mm
kg
kg・m2
MPa
(kgf／cm2)
25
35
69.3
(7067)
80.4
(8199)
2200
63
52
φ36〜304
78
0.918
S2091
3.22
(32.8)
22
30
53.8
(5486)
63.0
(6424)
3000
53
43
φ33〜254
45
0.306
S1875
3.20
(32.6)
19
25
41.1
(4191)
49.0
(4997)
3300
45
39
φ26〜215
25
0.198
S1552
2.99
(30.5)
15
20
27.9
(2845)
31.2
(3182)
4500
28
29
φ24〜165
14
0.043
S1246
3.40
(34.7)
Plungerstroke
Jawstroke（indiameter）
Allowablemaximuminputforce
Maximumstaticgrippingforce
Allowablemaximumrotation
speed
Thru-holediameter
Standardsoftjawheight
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
kN
(kgf)
kN
(kgf)
min-1
mm
mm
mm
kg
kg・m2
MPa
(kgf／cm2)
Type BLT206 BLT208 BLT210 BLT212
25
35
46.2
(4711)
53.6
(5465)
2200
63
52
φ44〜304
75.5
0.903
S2091
2.22
(22.6)
22
30
35.9
(3661)
42.0
(4283)
3000
53
43
φ40〜254
43.5
0.290
S1875
2.20
(22.4)
19
25
27.4
(2794)
32.7
(3334)
3300
45
39
φ32〜215
24
0.193
S1552
2.08
(21.2)
15
20
18.6
(1897)
20.8
(2121)
4500
28
29
φ24〜165
13.5
0.042
S1246
2.36
(24.1)
G6.3
−20〜＋50℃/−10〜＋40℃
・BL200type
・BLT200type
・Dangeroussinceitwill
becaught.
Alcohol
Greasegun
Greasenipple
NO
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.
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
24).
・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).
Fig.6
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14-17.
・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.
留 意
DANGER
NOTICE
・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.
DANGER
standardsoftjaw
Allowable
maximum
inputforce
GREASELUBURICATION
Kitagawagripping
forcemeter
Tightenatspecifiedtorque
AB
A=B
Fig.5
Limit
Limit
Limit
Limit
Limit
Limit
Limit
Limit
Gripping force(kN)
RotationSpeed（min-1）
Gripping force(kN)
RotationSpeed（min-1）
Gripping force(kN)
RotationSpeed（min-1）
Gripping force(kN)
RotationSpeed（min-1）
Gripping force(kN)
RotationSpeed（min-1）
Gripping force(kN)
RotationSpeed（min-1）
Gripping force(kN)
RotationSpeed（min-1）
20kN
35kN
45kN
60kN
15kN
23kN
30kN
40kN
10kN
16kN
23kN
30kN
10kN
16kN
22kN
17.9
53.6
35.9kN
2200
80
60
40
20
1000 3000
BLT212
02000
42
14
60
40
20
1000 3000
BLT210
0 2000
27.4kN
10.9
32.7
50
40
3300
30
20
10
40001000 3000
BLT208
0 2000
10kN
13kN
16kN
6.9
20.8
30
20
10
40001000 3000
18.6kN
BLT206
45000 2000
80.4
26.8
2200
80
60
40
20
1000 3000
69.3kN
BL212
0 2000
15kN
25kN
35kN
45kN
63
31.2
21
60
40
20
1000 3000
BL210
0 2000
15kN
25kN
35kN
16.3
49
50
40
3300
30
20
10
40001000 3000
41.1kN
BL208
0 2000
16kN
20kN
24kN
10.4
30
20
10
40001000 3000
27.9kN
BL206
45000
Gripping force(kN)
RotationSpeed（min-1）
2000
46.2kN
53.8kN
Input force
Input force
Input force
Input
force
Input
force
Input
force
Input force
Input force

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.
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
24).
・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).
Fig.6
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14-17.
・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.
留 意
DANGER
NOTICE
・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.
DANGER
standardsoftjaw
Allowable
maximum
inputforce
GREASELUBURICATION
Kitagawagripping
forcemeter
Tightenatspecifiedtorque
AB
A=B
Fig.5
Limit
Limit
Limit
Limit
Limit
Limit
Limit
Limit
Gripping force(kN)
RotationSpeed（min-1）
Gripping force(kN)
RotationSpeed（min-1）
Gripping force(kN)
RotationSpeed（min-1）
Gripping force(kN)
RotationSpeed（min-1）
Gripping force(kN)
RotationSpeed（min-1）
Gripping force(kN)
RotationSpeed（min-1）
Gripping force(kN)
RotationSpeed（min-1）
20kN
35kN
45kN
60kN
15kN
23kN
30kN
40kN
10kN
16kN
23kN
30kN
10kN
16kN
22kN
17.9
53.6
35.9kN
2200
80
60
40
20
1000 3000
BLT212
02000
42
14
60
40
20
1000 3000
BLT210
0 2000
27.4kN
10.9
32.7
50
40
3300
30
20
10
40001000 3000
BLT208
0 2000
10kN
13kN
16kN
6.9
20.8
30
20
10
40001000 3000
18.6kN
BLT206
45000 2000
80.4
26.8
2200
80
60
40
20
1000 3000
69.3kN
BL212
0 2000
15kN
25kN
35kN
45kN
63
31.2
21
60
40
20
1000 3000
BL210
0 2000
15kN
25kN
35kN
16.3
49
50
40
3300
30
20
10
40001000 3000
41.1kN
BL208
0 2000
16kN
20kN
24kN
10.4
30
20
10
40001000 3000
27.9kN
BL206
45000
Gripping force(kN)
RotationSpeed（min-1）
2000
46.2kN
53.8kN
Input force
Input force
Input force
Input
force
Input
force
Input
force
Input force
Input force

16
15
Fig.8
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.
・Keeptheheightofthetopjawwithintherangeofthegrippingforcelimittable.(RefertoFig.8,9)
・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.
DANGER
Fig.7
Standardsofttopjaw Standardsofttopjaw
Standardsofttopjaw Standardsofttopjaw
750min-1
Limit
Inputforce
Limit
Inputforce
Staticgrippingforce（kＮ）
Grippingforceloss（kＮ）
Massmomentoftopjaw
m×r×3（㎏・㎜ ）
GrippingpartcenterheightH （㎜）
Grippingforceloss（kＮ）
Massmomentoftopjaw
m×r×3（㎏・㎜ ）
GrippingpartcenterheightH （㎜）
Staticgrippingforce（kＮ）
BL208
30
25
20
15
10
5
0
1000min
-1
32.7
2602402001601208040 0
60
50
40
30
20
10
70605040302010
49
11kN
14kN
17kN
3921
20kN
23kN
26kN
29kN
32kN
35kN
38kN
41.1kN
1500min
-1
2000min
-1
2500min
-1
3000min
-1
3300min
-1
908070
BL206
20
15
10
5
20.8
16 29
31.2
6050403020
13kN
3500min-1
4000min
-1
4500min-1
7kN
10kN
16kN
19kN
22kN
25kN
30
6050403020
1000min
-1
1500min
-1
2000min
-1
2500min-1
3000min
-1
010 0 10
20
10
Standardsofttopjaw Standardsofttopjaw
750min-1
Standardsofttopjaw Standardsofttopjaw
Limit
Inputforce
42
Grippingforceloss（kＮ）
Massmomentoftopjaw
m×r×3（㎏・㎜ ）
Staticgrippingforce（kＮ）
GrippingpartcenterheightH （㎜）
Massmomentoftopjaw
m×r×3（㎏・㎜ ）
1000min
-1
1500min
-1
2000min
-1
2500min
-1
3000min
-1
50
1200800
53.6
Grippingforceloss（kＮ）
BL212
40
200
30
20
10
0
750min-1
1000min
-1
1000400 600
1500min
-1
2000min
-1
2200min
-1
GrippingpartcenterheightH （㎜）
0
5228
50kN
56kN
62kN
19kN
25kN
31kN
37kN
44kN
69.3kN
0
BL210
40
200100
30
20
10
0500400300
Limit
Inputforce
90
80
70
60
50
40
30
20
10
80604020
63
4323
15kN
20kN
25kN
30kN
35kN
40kN
45kN
50kN
10
20
30
40
50
60
70
20 40 60 80
53.8kN
Staticgrippingforce（kＮ）
・BL200type
・BLT200type
Standardsofttopjaw
Standardsofttopjaw
Standardsofttopjaw
Standardsofttopjaw
Standardsofttopjaw
Standardsofttopjaw
750min-1
750min-1
GrippingpartcenterheightH （㎜）
Staticgrippingforce（kＮ）
Massmomentoftopjaw
m×r×2（㎏・㎜ ）
Grippingforceloss（kＮ）
28
GrippingpartcenterheightH （㎜）
Staticgrippingforce（kＮ）
Massmomentoftopjaw
m×r×2（㎏・㎜ ）
Grippingforceloss（kＮ） Grippingforceloss（kＮ）
GrippingpartcenterheightH （㎜）
Staticgrippingforce（kＮ）
Massmomentoftopjaw
m×r×2（㎏・㎜ ）
3000min
-1
2500min-1
2000min-1
1500min
-1
1000min
-1
1000min
-1
1500min
-1
2500min
-1
3000min-1
3500min-1
4000min-1
4500min
-1
13.9
BLT206
170
908070
10
5
6050403020010
350
BLT210
200100
20
10
0300
BLT208
20
15
10
5
0
1000mi
n
-1
21.8
1601208040
1500min
-1
2000min
-1
2500min-1
3000min
-1
3300min
-1
Limit
Inputforce
35.9kN
33kN
30kN
27kN
24kN
21kN
18kN
15kN
12kN
42
4323
10
20
30
40
50
60
01020304050607080
Limit
Inputforce
0
20.8
6050403020
010
20
10
15kN
13kN
11kN
9kN
7kN
5kN
29
17kN
Limit
Inputforce
7060403020
27.4kN
32.7
25kN
23kN
21kN
19kN
17kN
15kN
13kN
11kN
9kN
7kN
10
20
30
40
39
21
5010
2000min
-1
r
Work
Chuck
AB
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
H
Chuck
r
GG
27.9kN
18.6kN
16
80.4

16
15
Fig.8
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.
・Keeptheheightofthetopjawwithintherangeofthegrippingforcelimittable.(RefertoFig.8,9)
・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.
DANGER
Fig.7
Standardsofttopjaw Standardsofttopjaw
Standardsofttopjaw Standardsofttopjaw
750min-1
Limit
Inputforce
Limit
Inputforce
Staticgrippingforce（kＮ）
Grippingforceloss（kＮ）
Massmomentoftopjaw
m×r×3（㎏・㎜ ）
GrippingpartcenterheightH （㎜）
Grippingforceloss（kＮ）
Massmomentoftopjaw
m×r×3（㎏・㎜ ）
GrippingpartcenterheightH （㎜）
Staticgrippingforce（kＮ）
BL208
30
25
20
15
10
5
0
1000min
-1
32.7
2602402001601208040 0
60
50
40
30
20
10
70605040302010
49
11kN
14kN
17kN
3921
20kN
23kN
26kN
29kN
32kN
35kN
38kN
41.1kN
1500min
-1
2000min
-1
2500min
-1
3000min
-1
3300min
-1
908070
BL206
20
15
10
5
20.8
16 29
31.2
6050403020
13kN
3500min-1
4000min
-1
4500min-1
7kN
10kN
16kN
19kN
22kN
25kN
30
6050403020
1000min
-1
1500min
-1
2000min
-1
2500min-1
3000min
-1
010 0 10
20
10
Standardsofttopjaw Standardsofttopjaw
750min-1
Standardsofttopjaw Standardsofttopjaw
Limit
Inputforce
42
Grippingforceloss（kＮ）
Massmomentoftopjaw
m×r×3（㎏・㎜ ）
Staticgrippingforce（kＮ）
GrippingpartcenterheightH （㎜）
Massmomentoftopjaw
m×r×3（㎏・㎜ ）
1000min
-1
1500min
-1
2000min
-1
2500min
-1
3000min
-1
50
1200800
53.6
Grippingforceloss（kＮ）
BL212
40
200
30
20
10
0
750min-1
1000min
-1
1000400 600
1500min
-1
2000min
-1
2200min
-1
GrippingpartcenterheightH （㎜）
0
5228
50kN
56kN
62kN
19kN
25kN
31kN
37kN
44kN
69.3kN
0
BL210
40
200100
30
20
10
0500400300
Limit
Inputforce
90
80
70
60
50
40
30
20
10
80604020
63
4323
15kN
20kN
25kN
30kN
35kN
40kN
45kN
50kN
10
20
30
40
50
60
70
20 40 60 80
53.8kN
Staticgrippingforce（kＮ）
・BL200type
・BLT200type
Standardsofttopjaw
Standardsofttopjaw
Standardsofttopjaw
Standardsofttopjaw
Standardsofttopjaw
Standardsofttopjaw
750min-1
750min-1
GrippingpartcenterheightH （㎜）
Staticgrippingforce（kＮ）
Massmomentoftopjaw
m×r×2（㎏・㎜ ）
Grippingforceloss（kＮ）
28
GrippingpartcenterheightH （㎜）
Staticgrippingforce（kＮ）
Massmomentoftopjaw
m×r×2（㎏・㎜ ）
Grippingforceloss（kＮ） Grippingforceloss（kＮ）
GrippingpartcenterheightH （㎜）
Staticgrippingforce（kＮ）
Massmomentoftopjaw
m×r×2（㎏・㎜ ）
3000min
-1
2500min-1
2000min-1
1500min
-1
1000min
-1
1000min
-1
1500min
-1
2500min
-1
3000min-1
3500min-1
4000min-1
4500min
-1
13.9
BLT206
170
908070
10
5
6050403020010
350
BLT210
200100
20
10
0300
BLT208
20
15
10
5
0
1000mi
n
-1
21.8
1601208040
1500min
-1
2000min
-1
2500min-1
3000min
-1
3300min
-1
Limit
Inputforce
35.9kN
33kN
30kN
27kN
24kN
21kN
18kN
15kN
12kN
42
4323
10
20
30
40
50
60
01020304050607080
Limit
Inputforce
0
20.8
6050403020
010
20
10
15kN
13kN
11kN
9kN
7kN
5kN
29
17kN
Limit
Inputforce
7060403020
27.4kN
32.7
25kN
23kN
21kN
19kN
17kN
15kN
13kN
11kN
9kN
7kN
10
20
30
40
39
21
5010
2000min
-1
r
Work
Chuck
AB
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
H
Chuck
r
GG
27.9kN
18.6kN
16
80.4

Standardsofttopjaw
Standardsofttopjaw
Limit
Inputforce
GrippingpartcenterheightH （㎜）
Staticgrippingforce（kＮ）
Massmomentoftopjaw
m×r×2（㎏・㎜ ）
Grippingforceloss（kＮ）
800
35.7
BLT212
200
30
20
10
0
750min-1
1000min
-1
400 600
1500min
-1
2000min
-1
2200min-1
53.6
5228
800
60
50
40
30
20
70605040302010
10
46.2kN
41kN
37kN
33kN
29kN
25kN
21kN
17kN
13kN
（Incorrect）
（Correct）
Softjaw
Tnut
Hardjaw
Tnut
Body Body Body Body
1
Topjawattachingbolt
Topjaw
Tnut
0〜1mm
Reference
Entirestroke
Masterjaw
Appropriatestroke
17
18
4 − 1 Attachmentofsoftjaw
4.FormingSoftJaw
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.
Fig.9
・Reducetheallowablemaximuminputforceofthe2jawchuckby2/3incomparisonwiththe3jawchuck.(Refer
toTable3)Otherwisethechuckwillbreak,theworkwillflyoutandthisisdangerous.
・Inthecaseofinsidediametergripping,keeptheinputto1/2oftheallowablemaximuminputorless.Inthecase
ofinsidediametergripping,thelengthofengagementofthemasterjawandthedovetailgrooveisshorterwhen
compared to the outside diameter gripping, therefore, the chuckwill break, the work will fly out and this is
dangerous.
・Inthecaseofusingonly1jawforgrippingreducetheinputforceby2/3ormorewith3jawchuck.If2jawsare
usedforgrippingreducetheinputforceby1/3ormorewith3jawchuck.If1jawisusedforgrippingreducethe
inputforceby1/2ormorewith2jawchuck.Ifitisusedwithoutloweringtheinput,theinputwhichisnormally
appliedevenlyonto3ofthejawsisconcentratedonto1or2ofthejaws.Otherwisethechuckwillbreak,thework
willflyoutandthisisdangerous.
Analysisofthegrippingforce,inputforceandrotationspeedusingFig.8,9iscarriedoutasshownbelow.
・Forexample,inthecaseofBL206standardsoftjaw(massmoment38.2kg・mm),itcannotexceed4500min-1
(rpm),andthegrippingforcelossduetothecentrifugalforceatthisrotationspeedis20.8kN(approx.2120kgf).
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 31.2kN, and the required input to obtain this
grippingforceis27.9kN.However,itisnecessarytouseatthegrippingpartcenterheightH=16mm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, 9,
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.
NOTICE
DANGER
・UsetheTnutsothatitdoesnotcomeoutfromthemasterjaw.(RefertoFig.10)
・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.
Table5
・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.11).
・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masterjawiswithintherangeoftheentirestrokeasshowninFig.12.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obtained.
・When gripping near the stroke end, the work may not be gripped sometimes
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.11
Fig.12
Fig.10
DANGER
Table4
DANGER
Appropriatestrokerange（mm）
Type BL206
BLT206
6
BL208
BLT208
8
BL210
BLT210
10
BL212
BLT212
12
Boltsize Tighteningtorque
M4
M5
M6
M8
3.8N・m
7.5N・m
13N・m
33N・m
Boltsize Tighteningtorque
M10
M12
M14
M16
73N・m
107N・m
171N・m
250N・m

Standardsofttopjaw
Standardsofttopjaw
Limit
Inputforce
GrippingpartcenterheightH （㎜）
Staticgrippingforce（kＮ）
Massmomentoftopjaw
m×r×2（㎏・㎜ ）
Grippingforceloss（kＮ）
800
35.7
BLT212
200
30
20
10
0
750min-1
1000min
-1
400 600
1500min
-1
2000min
-1
2200min-1
53.6
5228
800
60
50
40
30
20
70605040302010
10
46.2kN
41kN
37kN
33kN
29kN
25kN
21kN
17kN
13kN
（Incorrect）
（Correct）
Softjaw
Tnut
Hardjaw
Tnut
Body Body Body Body
1
Topjawattachingbolt
Topjaw
Tnut
0〜1mm
Reference
Entirestroke
Masterjaw
Appropriatestroke
17
18
4 − 1 Attachmentofsoftjaw
4.FormingSoftJaw
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.
Fig.9
・Reducetheallowablemaximuminputforceofthe2jawchuckby2/3incomparisonwiththe3jawchuck.(Refer
toTable3)Otherwisethechuckwillbreak,theworkwillflyoutandthisisdangerous.
・Inthecaseofinsidediametergripping,keeptheinputto1/2oftheallowablemaximuminputorless.Inthecase
ofinsidediametergripping,thelengthofengagementofthemasterjawandthedovetailgrooveisshorterwhen
compared to the outside diameter gripping, therefore, the chuckwill break, the work will fly out and this is
dangerous.
・Inthecaseofusingonly1jawforgrippingreducetheinputforceby2/3ormorewith3jawchuck.If2jawsare
usedforgrippingreducetheinputforceby1/3ormorewith3jawchuck.If1jawisusedforgrippingreducethe
inputforceby1/2ormorewith2jawchuck.Ifitisusedwithoutloweringtheinput,theinputwhichisnormally
appliedevenlyonto3ofthejawsisconcentratedonto1or2ofthejaws.Otherwisethechuckwillbreak,thework
willflyoutandthisisdangerous.
Analysisofthegrippingforce,inputforceandrotationspeedusingFig.8,9iscarriedoutasshownbelow.
・Forexample,inthecaseofBL206standardsoftjaw(massmoment38.2kg・mm),itcannotexceed4500min-1
(rpm),andthegrippingforcelossduetothecentrifugalforceatthisrotationspeedis20.8kN(approx.2120kgf).
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 31.2kN, and the required input to obtain this
grippingforceis27.9kN.However,itisnecessarytouseatthegrippingpartcenterheightH=16mm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, 9,
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.
NOTICE
DANGER
・UsetheTnutsothatitdoesnotcomeoutfromthemasterjaw.(RefertoFig.10)
・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.
Table5
・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.11).
・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masterjawiswithintherangeoftheentirestrokeasshowninFig.12.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obtained.
・When gripping near the stroke end, the work may not be gripped sometimes
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.11
Fig.12
Fig.10
DANGER
Table4
DANGER
Appropriatestrokerange（mm）
Type BL206
BLT206
6
BL208
BLT208
8
BL210
BLT210
10
BL212
BLT212
12
Boltsize Tighteningtorque
M4
M5
M6
M8
3.8N・m
7.5N・m
13N・m
33N・m
Boltsize Tighteningtorque
M10
M12
M14
M16
73N・m
107N・m
171N・m
250N・m

φd
φD
φD
φD '
B
A
BA
φD′ φD φD
φd
20
19
１．Preparationoftheringforforming
・Prepare the ring for forming. The surface roughness of the ring
inside diameter is to be approximately 25s, and make a shape
withasufficientthicknesswhichdoesnotdistort.
・Itisconvenienttopreparevariousinsidediameterdimensionsfor
dimensionsofformingparts.
２．Processoftheringgrippingpartforforming
・Operatetheswitchvalveandminimizethejawtoclose.
・Then,processtheφDpart(parttogriptheringforforming).Set
the dimension φD so that gripping near the center of the jaw
maximumstroke(diameter)ispossible.
・φD=φd-(jawmaximumstroke/2)
３．Grippingoftheringforforming
・Byoperatingtheswitchvalve,griptheringforformingintheφD
part.Atthistime,gripbypressingtheringonthejawinorderfor
theringnottobetilted.Repeatchuckingseveraltimestostabilize
thering.
４．Forming
・Processthegrippingpart(dimensionφD')oftheworkinthestate
thattheringiskeptgripped.TheφD'partistobeapproximately
thesamediameter(H7)asthediameterofthegrippingpartofthe
work,andprocesstobesurfaceroughnessat6sorless.
・Set the hydraulic pressure when forming the same as when
processing of the work, or slightly higher. Additionally, in the
caseofinsidediametergripping,itisnecessarytousetheinputat
1/2oftheallowablemaximuminputorless.
・Whentheringdistorts,lowerthehydraulicpressureorchangethe
ringintoashapewhichdoesnoteasilydistort.
５．Trialcutting
・Removetheringforforming and griptheworktocheckthe jaw
stroke.
・Implement trial cutting to check the process precision and that
thereisnoslip,etc.
・Contactingonthegrippingsurfaceistobe2pointscontactofthe
sideAandthesideBwhengripping.
4 − 3 Formingsoftjawwithinsidediametergripping
１．Preparationoftheplugforforming
・Preparethe plugfor forming.Thesurface roughnessof theplug
outsidediameter is to beapproximately 25s, and make a shape
withsufficientthicknesswhichdoesnotdistort.
・Itisconvenienttopreparevariousoutsidediameterdimensionsfor
dimensionsofformingparts.
・Itis convenient toprocess tappingin the center part ofthe plug
andtoguidewithabolt,etc.
２．Processofthepluggrippingpartforforming
・Operatetheswitchvalveandmaximizetheopeningofthejaw.
・Then,processtheφDpart(parttogriptheplugforforming).Set
the dimension φD so that gripping near the center of the jaw
maximumstroke(diameter)ispossible.
・φD=φd+(jawmaximumstroke/2)
３．Grippingoftheplugforforming
・Byoperatingtheswitchvalve,griptheplugforformingintheφD
part. At this time, grip by pressing the plug on the chuck front
surface in order for the plug not to be tilted. Repeat chucking
severaltimestostabilizetheplug.
４．Forming
・Processthegrippingpart(dimensionφD')oftheworkinthestate
thattheplugiskeptgripped.TheφD'partistobeapproximately
thesamediameter(H7)asthediameterofthegrippingpartofthe
work,andprocesstobesurfaceroughnessat6sorless.
・Set the hydraulic pressure during forming the same as during
processingofthework,orslightlyhigher.
・Whentheplugdistorts,lowerthehydraulicpressureorchangethe
plugintoashapewhichdoesnoteasilydistort.
５．Trialcutting
・Removetheplugforformingandgriptheworktocheckthejaw
stroke.
・Implement trial cutting to check the process precision and that
thereisnoslip,etc.
・Contactingonthegrippingsurfaceistobe2pointscontactofthe
sideAandthesideBwhengripping.
4 − 2 Formingsoftjawwithoutsidediametergripping