Version 1.10 (2021.08.03)
Original instructions

INSTRUCTION MANUAL

HOH type

High-Speed Large Thru-Hole Power ChuckDANGER
・This instruction manual is for production engineers andmaintenance personnel in charge of operation of this product.
When a beginner uses this product, receive instructions fromexperienced personnel, the distributor or our company.
・Before installing, operating or maintaining this equipment,
carefully read this manual and the safety labels attached tothe 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.

Kitagawa Corporation
77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,JapanTe l . +81-847-40-0561
Fax. +81-847-45-8911

Preface
This manual provides detailed information about how to safely and correctly use the power chuck (HOH type) for alathe.
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 theseprecautions could result in a serious accident.

Terms and Symbols Used for Safety Messages
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 themeanings of these terms and follow the instructions for safe operation.

Safety Alert Symbol
The triangle is the safety alert symbol used to alert you to potential safety hazards that could result in injury or death.

DANGER

Indicates a hazardous situation which, if you not avoided,
will result in death or serious injury.

WARNING

Indicates a hazardous situation which, if you not avoided,
could result in death or serious injury.

CAUTION

Indicates a hazardous situation which, if you not avoided,
could result in minor or moderate injury.

NOTICE

Indicates instructions which, if not avoided, could result indamage to the equipment or a shortened work life.

Liability and How to Use this ManualThis product is suitable for gripping a workpiece on the lathes or rotary tables. This product is equipped with the jaws toclamp 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 tosafety 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.

Guarantee and Limitation of Liability
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 becompletely 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.
1

Table of Contents
1. Structural Drawing and Parts List ………………………………………………………………

3

1-1. Type display
1-2. Structural drawing
1-3. Scope of product1-4. Parts list

Important Safety Precautions …………………………………………………………

6

3. Specifications ……………………………………………………………………………………

12

2.

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

4. Forming Soft Jaw ………………………………………………………………………………

17

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 ……………………………………………………………………………………………

21

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 …………………………………………………………………

23

6-1. Periodic Inspection
6-2. Grease lubrication
6-3. Disassembling

7. Malfunction and Countermeasures ……………………………………………………………

25

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 ………………………………………………………………………………………

26

8-1. Outline drawing of attachment
8-2. Production of draw pipe
8-3. Processing of draw nut
8-4. Attachment of chuck

9. Other Information ………………………………………………………………………………

32

9-1. About standards and orders
9-2. Information about markings of product9-3. About disposal

21 . Structural Drawing and Parts List
1−1 Type display
Type display as shown below

HOH-2 06 999
Design No.
Chuck nominal diameter（Inch）
HOH-200 series

Chuck nominal diameter（Inch）

HOH-10 K 999
Design No.
HOH.K series

Fig. 1

1−2 Structural drawing
Counter lever

Lever pin
Master jaw

Counter weight

Top jaw（Soft jaw. hard jaw.
special jaw included）

Draw nut

Cover
T nut

Plunger nut

Attaching bolt
Back plate

Body

Wedge plunger

Fig. 23

1−3 Scope of productThis instruction manual is for the chuck part.

Chuck

CylinderDrain hose

Pressure adjusting
screw

Hydraulicpump

Pressuregauge

Flexible hose

Manual switchingvalveLine Filter

SOL.

Solenoid
valve

Tank

Fig. 3WARNING・To prevent the work from flying, safe design, maintenance and erroneous action prevention of the hydraulicsystem 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.

4

1−4 Parts list

10
30 18

19 31
15 27

4

8

5

1

3

33

25
2

23
11

7

13

6
32 22

16 28

32 26
14

12

24
20

9

21

17 29

Fig. 4
Table 1

No.

Part name

QuantityNo.

Quantity

1

Body

1

18

Jaw attaching bolt

62

Wedge plunger

1

19

Chuck attaching bolt

63Master jaw

3

20

Set screw

1

4

Soft jaw

3

21

Steel ball

1

5

T nut

3

22

Set screw

3

6

Plunger nut

1

23

Grease nipple

67Draw nut

1

24

Grease nipple

3

8

Cover

1

25

Plug

6

9

Coil spring1

26

Set screw

3

10

Handle1

27

Hex key1

11Counter lever3

28

Hex key1

12Back plate1

29

Hex key1

13Counter weight3

30

Hex key

1

14

Lever pin

3

31

Hex key

1

15

Socket head cap screw

3or6

32

Hex key

1

16

Socket head cap screw

6

33

Eyebolt

1

17

Socket head cap screw

9or12

Note: Eye bolt is the standard attached in case of 10 inch or more.
5Part name2.

Important Safety Precautions

Important safety precautions are summarized below. Please read this section before firststarting to use this product.

DANGER

Failure to follow the safety precautions below will result inserious injury or death.

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 becaught.

Main power supply

OFF
ON

Lathe

OFF

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, thesafety interlock function which allows
rotation only when the door is the manualmode or the test mode)

For All Users

Close
Lathe

During spindle rotation, do not turn off hydraulic pump power supply
and do not operate switching valve.
For All Users
・Cutting off hydraulic pressurecauses a drop in the gripping
force which could result in thework being released and flyingout.
・Operatingthemanualswitching valve or solenoid
valve will lead to a drop of
hydraulic pressure.

Manual switching valve
Jaw
closed

NO

Work

Jaw
open

ON
OFF

Solenoid valve
6

DANGER

Failure to follow the safety precautions below will result inserious injury or death.

Do not allow the rotation speed of the chuck to exceed the maximum allowablespeed limit. (Refer to pages 14)
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 flyout.

Fly outWork

The input force of the chuck (piston thrust, pulling force of the draw pipe)
must not exceed the allowable maximum input force.
For All Users(Refer to pages 13-16)
・Input must match the specification of
the chuck.
・Adjust the hydraulic pressure to thecylinder so that the input force, which
determines the gripping force of thechuck, does not exceed.
・Excessive input force can lead tobreakage of the chuck, which is very
dangerous, as the chuck can work
can be damaged and fly out.

CylinderDraw pipe

Fly out

Allowable maximum
input force or less

Work
Chuck

If you use the chuck with the inside diameter gripping, input force (hydraulicpressure) must be 1/2 or less of the allowable maximum input.
For All Users(Refer to page 16)
・The chuck may break and the chuckor work could fly out.

Input force (hydraulic pressure)
to be 1/2 or less

DOW

N

PRESSURE
GAUGE

7

Important Safety Precautions

DANGER

Failure to follow the safety precautions below will result inserious injury or death.

Keep the height of the jaw within the range specified in the gripping force limit table (Refer to pages 15-16).
If you must use a jaw taller than a standard soft jaw, use less than the input (piston
For All Users
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 outof the range of the gripping force
limit table. The chuck will break andthe chuck and work will break and flyout.

Special top jaw heightStandard soft
jaw height

Lower the hydraulicpressure when using
a tall jaw

DOW

N

PRESSURE
GAUGE

Work

When the protrusion of the work is long, support it withthe steady rest or center.

For All Users

・If the protrusion is long, the tip of the work can turn and the work fly out.
Tail stock

Steady rest

CenterDetermine the gripping force required for processing by the machine tool manufacturer or user,
and check that the required gripping force is provided before processing.
For All Users(Refer to pages 13-14 and cylinder manual)・Adjust the hydraulic pressure to thecylinder to obtain the required gripping
force. If the gripping force is insufficient,
this is dangerous as the work will fly out.

Fly out

Work

8

DANGER

Failure to follow the safety precautions below will result inserious injury or death.

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
For All Users
and work flying out.
・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
CylinderChuck
operation, immediately stop the machine and consult with ourcompany or the distributor.
Fly out
・ The work slips.
・ Loss of accuracy.
・ The work begins to chatter.
Work・ The machine's vibration significantly increases.
・ The griping force does not rise even if hydraulic pressure is raised.

In the case of processing a significant unbalanced work,
lower the rotation speed.

For All Users

Unbalanced work

・Unbalanced work generates dangerous
centrifugal forces and the work could flyout.

Fly out

Always tighten the bolts at the specified torque. If the torque is insufficient or excessive, thebolt will break, which is dangerous as the chuck or work will fly out. Use the
For All Users
bolts attached to the chuck, and do not use bolts other than these.
・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 andget injury when you work without fixing thespindle.
・You cannot control the torque by a hex
key. You must use a torque wrench fortorque control.

Specified torque for socket head cap screw
Bolt size
M5
M6
M8
M10

Tightening torque
7.5 N・m13 N・m33 N・m73 N・mTightening torque
T＝F×L＝127×0.1＝12.7（N・m）

Bolt size
M12
M14
M16
M20

Tightening torque
107 N・m
171 N・m
250 N・m402 N・m

F＝127（N）（13kgf）

0.1（

m）

L＝

・Tightening torque is moment of force when you tighten a bolt. Tightening torque= F×L.

9

Important Safety Precautions

DANGER

Failure to follow the safety precautions below will result inserious injury or death.

Provide sufficient strength for the draw pipe (Refer to pages 27-28).
Provide sufficient screw depth for the draw pipe.
For Machine Tool Manufactures
Firmly tighten the draw pipe.
・If the draw pipe break, the gripping force isinstantly lost and this is dangerous as work will Cylinder adapter
fly out.
Cylinder・If the screw depth of the draw pipe isinsufficient, the screw will break and thegripping force will be lost instantly, and this isdangerous 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, thegripping force will be lost instantly, which isdangerous 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.

Draw pipe

Chuck

Back plate

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
For Machine Tool Manufactures
gripping position when no current is carried.
・If the hydraulic pressure suddenly drops
due to blackout or malfunction of thehydraulic pump, etc., this is dangerous aswork will fly out.
・Lock valve retains the hydraulic pressure
inside the cylinder temporarily, when thehydraulic pressure suddenly drops due toblackout or malfunction of the hydraulicpump, etc.

Lightning＝Blackout

Loosening

Gripping

Lock valve
CylinderP

Solenoid valve

The grlipping position
must be retained.

10Important Safety Precautions

WARNING

Failure to follow the safety precautions below could result inserious injury or death.

Do not modify the chuck in a way not permitted
by the manufacturer.

For All Users

・It may not only break the chuck but thechuck and the work may fly out, which isdangerous.
・If you attach a locator or jig on the chuck
body surface, only process work in an
acceptable range (Refer to page 22).

NO

Periodically supply adequate grease (Refer to page 23). Turn off power before
adding grease.
For All Users
・Insufficient grease supply lowers thegripping force, causes operation failure due
to lower hydraulic pressure, lowers thegripping precision, and causes abnormal
wearing and seizing, etc.
・This is dangerous as the work could fly out
from a drop in the gripping force.

Grease gun
Grease nipple

Do not operate the machine wearing gloves,a necktie, and other loose
For All Users
clothing or jewelry.

Do not operate the machine after
drinking alcohol or
For All Users
taking medication.

・Dangerous since it will
be caught.

・Dangerous sincethese lead tooperation mistakes
and misjudgment.

Alcohol

Medication

Do not grip a chuck with a chuck.
・Because it is easy to confuse the specifications ofeach chuck and the protrusion become long and is
apt to raise rotation speed, it is apt to exceed thespecifications of the base chuck. The chuck may
break and the chuck or work could fly out.

11

For All Users

3 . Specifications
3−1 Specifications
Table 2Type

HOH-206

HOH-208

HOH-10K

HOH-12K

HOH-15K

mm

12

16

19

23

23

Jaw stroke（in diameter） mm

5.5

7.4

8.8

10.6

10.6

Plunger stroke

kN

22

34

38

49

71

input force(kgf)(2243)(3467)(3875)(4997)(7240)

Maximum static gripping force

kN

57

84

99

129

180

(kgf)

(5812)(8566)(10095)(13154)(18355)

-1

7000

6000

4500

3500

2800

mm

45

52

65

78

117.5

mm

29

39

46

54

70

mm

φ16〜169

φ13〜210

φ25〜254

φ23〜304

φ30〜381(standard soft jaw included) kg

15.7

29

40

67

124

Moment of inertia

0.068

0.193

0.350

0.875

2.55

S1246

S1552

S1875

S2091

F2511HAllowable maximum

Allowable maximum

minrotation speed
Thru-hole diameter mm
Standard soft jaw height(Z axis)Gripping range(outside diameter gripping)
Mass

2

kg・m

Matching cylinder
Maximum hydraulic pressure(with matching cylinder)

MPa

2.75

2.52

2.31

2.91

2.47

(kgf/cm2)(28.0)(25.7)(23.6)(29.7)(25.2)

A 2 -5A 2 -6A 2 -8A 2 -8A 2 -11

SpindleBalance quality

G6.3(standard soft jaw not included)
Storing temperature /−20〜＋50°／−10〜＋40°

Operating temperature
2

Reference: 1kN = 101.97kgf 1MPa = 10.197kgf/cm
When storing this product, the product should be subjected to the antirust treatment and stored in a place free fromwetting, condensation, or freeze.

12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 thestandard soft jaw
A
B
A=B
jaw.
・The attaching bolts of the soft jaw are tightenedat 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 Allowable
position 1/2 of the height of the soft jaw top maximum
surface (height from the chuck surface to the top input force
surface of the jaw).
・CHUCK GREASE PRO is used. (Refer to page
23).
・A variable displacement pump with the discharge
volume of 20 liters/min or more is used as thehydraulic source. The pressure is set by thepressure control equipment of the pump itself, or
the pressure reduction valve equipped
separately.

Kitagawa gripping
force meter

Tighten at specified torque
GREASE LUBURICATION

Fig. 5

2. Allowable maximum rotation speed
In the case of outside diameter gripping, when the chuck is rot ated, the gripping force lowers due to the centrifugal forceof the top jaw. 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 thefollowing 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 ofthe jaw).

DANGERTo 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 thatthe 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 thegripping force required for the processing. The rotation speed at this point must not exceed the allowablemaximum rotation speed.

NOTICE留
意・When determining the cutting conditions, refer to page 14.
・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.

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 thestandard soft jaw. The centrifugal force differs significantly depending on the size and shape of the top jaw and theattaching position, therefore, when the rotation speed is high, actual measurement using a Kitagawa gripping force
meter is required.

Gripping force(kN)

100

80

HOH-208
HOH-206

60

40

20

0

1000

2000

3000

5000

4000

6000

7000

Rotation Speed（min-1）
200

Gripping force(kN)180

HOH-15K

160

HOH-12K

140
120

HOH-10K

100
80
60
40
20
0

1000

2000

3000

4000

4500

Rotation Speed（min-1）

Fig. 6DANGER・In the case of processing a considerably unbalanced work, lower the rotation speed. The work will fly out and this isdangerous.
・Vibration is generated if there is unbalance due to the work and the jig, etc. Vibration decreases process precision andshortens 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 unbalanceof the chuck, therefore, set the cutting conditions appropriate for the dynamic gripping force and machine rigidity.

3-3 Relationship between gripping part center height, static griping force and input
force
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 thestandard 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 canwithstand the cutting force.

14

G
r

r

G

A

Chuck

B
Work

Chuck

A=B

H
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 heightFig. 7DANGER・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 andthis is dangerous as the chuck and work will fly out.

HOH-206
22kN
20kN

57

50

80

Limit

18kN
16kN

40

14kN
12kN

30

10kN
8kN

20

6kN

10
14
0

10

84

70

34kN
32kN
30kN
27kN

Limit

24kN

60

21kN

50

18kN

40

15kN

30

12kN

9kN

20
10

29
20

Input force

90

Static gripping force（kＮ）

Static gripping force（kＮ）

60

HOH-208

Input force

39

30

40

50

60

0

Standard soft top jaw

10

20

30

40

50

60

70

80

Standard soft top jaw

Gripping part center height H（㎜）Gripping part center height H（㎜）HOH-10K
120

Input force

HOH-12K

110

38kN
35kN

99

90

130

Limit

32kN

80

29kN

70

26kN

23kN

60

20kN

50

17kN

40

14kN

30

11kN

Limit

45kN

41kN

110

37kN

100

33kN

90
80

29kN

70

25kN

60

21kN

50

17kN

40

13kN

30

20

20

10

25

0

10

20

30

40

29

10

46
50

60

70

Standard soft top jaw
Gripping part center height H（㎜）

15

49kN

129

120

Static gripping force（kＮ）

Static gripping force（kＮ）

100

Input force

140

80

0

10

20

30

54
40

50

60

70

80

Standard soft top jaw
Gripping part center height H（㎜）

HOH-15K
200

Input force
71kN

180

Static gripping force（kＮ）

Limit
60kN

150

50kN
40kN

100

30kN
20kN

50

37
0

20

Standard soft top jaw

40

60

80

100

Gripping part center height H（㎜）Fig. 8NOTICE・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, andthe processing conditions must be determined after trial cutting without fail.

DANGER・In the case of inside diameter gripping, keep the input to 1/2 of the allowable maximum input or less. In the caseof inside diameter gripping, the length of engagement of the master jaw and the dovetail groove is shorter whencompared to the outside diameter gripping, therefore, the chuck will break, the work will fly out and this isdangerous.
・In the case of using only 1 jaw for gripping reduce the input force by 2/3 or more. If 2 jaws are used for gripping
reduce the input force by 1/3 or more. 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.

16

4 . Forming Soft Jaw
4−1 Attachment of 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 andthe cutting conditions, etc.

DANGER
・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 apossible precision failure.
Hard jaw
Soft jaw

T nut

T nut

Body

Body

Body

（Incorrect）

Body（Correct）

Fig. 9・Always tighten the bolts at the specified torque. If the torque is insufficient or excessive, the bolt will break, whichis dangerous as the chuck or work will fly out.

Table 3ボルトサイズ
M5
M6
M8

締付トルク
7.5 N・m13 N・m33 N・mボルトサイズ
M10
M12
M14

締付トルク
73 N・m
107 N・m
171 N・m

ボルトサイズ
M16
M20

締付トルク
250 N・m402 N・mDANGER

0〜1mm

Top jaw attaching bolt
・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
Top jaw
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 bottomof 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 forM22 or more) or more, and pay sufficient attention to the length.
T nut
Fig.10・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. 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
Reference
appropriate stroke range. Gripping in the center of the stroke is the most stable forthe 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,
Entire stroke
and this is dangerous as the work will fly out.
Appropriate stroke・When gripping near the stroke end, the chuck may break and the chuck or
Master jaw
Fig.11work could fly out.
1

Table 4
Type
Appropriate stroke range（mm）

17

HOH-2061

HOH-2082

HOH-10K
2.3

HOH-12K
3

HOH-15K
3

4−2 Forming soft jaw with outside diameter gripping
１．Preparation of the plug for forming

φd・Prepare the plug for forming. The surface roughness of the plugoutside diameter is to be approximately 25s, and make a shapewith 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 plugand to guide with a bolt, etc.

２．Process of the plug gripping part for forming

φD・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

φD・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

φD'・Process the gripping part (dimension φD') of the work in the statethat the plug is kept gripped. The φD' part is to be approximately
the same diameter (H7) as the diameter of the gripping part of thework, 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 theplug 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 theside A and the side B when gripping.

B

A

18

4−3 Forming soft jaw with inside diameter gripping
１．Preparation of the ring for forming

φd・Prepare the ring for forming. The surface roughness of the ringinside diameter is to be approximately 25s, and make a shapewith 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

φD・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

φD・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 forthe ring not to be tilted. Repeat chucking several times to stabilize
the ring.

４．Forming

φD'・Process the gripping part (dimension φD') of the work in the statethat the ring is kept gripped. The φD' part is to be approximately
the same diameter (H7) as the diameter of the gripping part of thework, and process to be surface roughness at 6s or less.
・Set the hydraulic pressure when forming the same as whenprocessing of the work, or slightly higher. Additionally, in thecase 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 thering 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 theside A and the side B when gripping.
B

19

A

4−4 Forming method when you use forming jig
１．Preparation of the jig for forming

Ex.1
・Prepare the jig for forming. (There is a commercially available
product.)
・Attach the pin (Example 1) or the bolt and nut (Example 2) bydividing equally into 3 portions onto the ring shape plate. Make the Protrusion
ring into a shape with sufficient thickness which does not distort.

Pin

Ex.2

Plate

Bolt and nut

２．Gripping of the jig for forming・Operate the switch valve and maximize the opening of the jaw.
Then, operate the switch valve to insert the jig for forming into thebolt hole of the soft jaw to grip. At this time, grip by pressing thering end surface of the jig for forming onto the jaw so as not togenerate run-out.
・Check that it is gripping almost in the center of the appropriate
stroke.
・Set the hydraulic pressure when forming slightly higher than whenprocessing the work.

３．Forming

φD'・Process the gripping part (dimension φD') of the work in the statethat the jig for forming is kept gripped. The φD' part is to beapproximately the same diameter (H7) as the diameter of thegripping part of the work, and process to be surface roughness at
6s or less.

４．Trial cutting
・Remove the jig 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 theside A and the side B when gripping.

B

A

20

5 . Usage
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.

NOTICE・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.

5−1 Precautions during gripping work with chuck
DANGER・When gripping a work with the chuck, do not
get fingers or hands become caught. This
could cause crushed or cut fingers and hands.

5−2 Precautions during gripping work in irregular shape
DANGER・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
DANGER・If a soft jaw other than one made by Kitagawa Corporation is used, the engagement will be inferior, and themaster 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 theserration will become insufficient, therefore, the serration crests will break when gripping the work, and this isdangerous 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 theserration 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.

21

5−4 Precautions related to processing
DANGER<1> Unbalance
・In the case of processing largely unbalanced work, lower the rotation speed. The work will fly out and this isdangerous.
・Vibrations are generated if there is unbalance owing to the work or the jig, etc. Vibration not only will impart anegative 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 notinterfere 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 thechuck 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 isgiven, 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.

5−5 Attachment of locator and jig
・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. 12.
Shaded part additional process possible range
C

A

B

Fig. 12

15°

Table 5Type
HOH-206
HOH-208
HOH-10K
HOH-12K
HOH-15K

A (mm)
30
33
36
42
51

B (mm)
53
63
75
83
107

C(mm)
20 or loss
20 or loss
20 or loss
20 or loss
30 or loss

A, B: Additional process impossible dimension.
C: Processible depth of tapping or drilling a hole.

DANGER
・The chuck can be modified only in the manufacturer permissible range. This will not only break the chuck but thechuck 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, andattach with bolts which have sufficient strength. The locator or the jig may fly out, and this is dangerous.

226 ．Maintenance and Inspection
6−1 Periodic Inspection
・Add grease at least once a day.
・Fully stroke the jaw before starting work or upon supplying grease, and check that the jaw is inside the appropriate
stroke area. (Refer to page 17)
・Always clean the chuck body or the sliding surface using an air gun, etc., at the end of work.
・Check that the bolts of each part are not loosened at least once every 3 months.
・Disassemble and clean at least once every 6 months or every 100,000 strokes (once every 2 months or more forcutting cast metal).

6−2 Grease lubrication
1. Position to lubricate
・Lubricate using a grease gun from the grease nipple on the body periphery part. Supply grease when the jaw is open.
After lubrication, repeat opening and closing the jaw several times without gripping work.

2. Grease to use
・Use the designated grease specified in Table 6. If grease other than the designated grease is used, sufficient effectmay not be obtained.

Table 6
Genuineproduct

CHUCK GREASE PRO

Conventional
product

Kitagawa chuck grease
Molykote EP Grease
Chuck EEZ grease
MOLYKOTE TP-42
Kluberpaste ME31-52

Kitagawa genuine product(Kitagawa distributor of each country)
Conventional product
TORAY Dow Corning (only inside Japan)
Kitagawa-Northtech Inc. (North American region)
Dow Corning (Europe, Asian region)
Kluber lubrication (worldwide)

3. Frequency of lubrication
・Add grease once every day.
・Add approximately 5g up to 8 inches and 10g for 10 inches or larger of grease to the each master jaw. Check thefilling degrees of the grease after removing the cover of the chuck center.
・In the case of high rotation or in the case of using a large amount of water soluble coolant, increase the frequency of
lubrication according to the usage conditions.

WARNING・To keep the chuck running in the best condition for a long time, adequate grease lubrication is necessary.
Insufficient grease lubrication causes a drop in the gripping force, operation failure at low hydraulic pressure,drop in gripping precision, abnormal wearing, seizing, etc. The work will fly out due to a drop in the gripping force
and this is dangerous.

4. Safety information about grease and anti-rust oil
Applicable range
・Designated grease・Antirust agent applied to the product at the delivery.

First aid measures
A f t e r i n h a l a t i o n : Remove victim to fresh air. If symptoms persist, call a physician.
After contact with skin : Wash off with mild cleaners and plenty of water. If symptoms persist, call a physician.
After contact with eyes : Rinse with plenty of water. If symptoms persist, call a physician.
A f t e r i n g e s t i o n : If large amounts are swallowed, do not induce vomiting. Obtain medical attention.
・ Please refer to each MSDS about the grease and the anti-rust oil which you prepared.

236−3 Disassembling
Disassembling procedures
Read the following disassembling procedures with reference to page 5.
1. Turn off the main power of the machine before starting work.
2. Loosen the jaw attaching bolt [18] and remove the soft jaw [4] and the T nut [5].
3. Remove the cover [8].
4. Turn the draw nut [7] with the handle [10] while loosening the chuck attaching bolt [19], and remove the chuck fromthe spindle.
5. Loosen the socket head cap screw [17] and remove back plate [12]. Then remove the counter weight [13].
6. Loosen the set screw [22, 26] and remove lever pin [14]. Then remove counter lever [11].
7. Remove the wedge plunger [2] to the chuck rear side.
8. Remove the master jaw [3] to the inner periphery side of the chuck.
9. Assemble again while sufficiently coating the recommended grease in the reverse procedures of disassembling. At
this time, pay sufficient attention so as not to make a mistake in the numbers of the body [1], master jaw [3], and thewedge plunger [2].
10. Refer to page 30 about the installation procedure. (8-4. Attachment of chuck).

CAUTION・Use an eyebolt or a hanging belt when attaching and detaching the chuck to and from the machine, as there is adanger of injury or damage if the chuck drops.
Chuck size(inch)
6 , 8 , 10
12, 15

Eyebolt
M10
M12

WARNING・Remove the eyebolt or the belt without fail after using. If the chuck is rotated with the eyebolt, etc., attached, they
may fly out and this is dangerous.
・Disassemble and clean the chuck at least once every 6 months or every 100,000 strokes (once every 2 months
or more for cutting cast metal). If cutting powder or other substances stagnate inside the chuck, it will lead toinsufficient stroke and a drop in the gripping force, and this is dangerous as the work will fly out. Check each part
carefully and replace any part that is worn or cracked.
・After inspection, apply sufficient grease in the designated areas and reassemble.
・After assembling, measure the gripping force according to the method on page 13, and check that the specified
gripping force is obtained.
・If you stop the machine for a long period of time, remove the work from the machine. If you don't, the work candrop due to a drop in the hydraulic pressure or the cylinder can stop or malfunction.
・If you stop the machine or store the chuck for a long period of time, add grease to prevent rust.

24

7 . Malfunction and Countermeasures
7−1 In the case of malfunction
Check the points specified in the table below and take the appropriate countermeasure.

Table 7
Defective
The chuckdoes notoperate.
Insufficient

Cause

Countermeasure

The chuck inside will break.

Disassemble and replace the broken part.
Disassemble, correct the seized part with oilstone, etc., or replace

The sliding surface is seized.

the part.
Check the piping and the electric system, and if there is no

The cylinder is not operating.

abnormality, disassemble and clean the cylinder.

A large amount of cutting powder is inside.

stroke of the jaw. The draw pipe loosened.

Remove the draw pipe and retighten it again.

The stroke of the jaw is insufficient.
The gripping force is insufficient.
The forming diameter of the top jaw is notconsistent with the work diameter.
The Workslips.

Disassemble and clean.
Adjust so that the jaw is near the center of the stroke whengripping the work.
Check that the correct hydraulic pressure is obtained.
Form again based on the correct forming method.
Calculate the cutting force and check that it is suitable for the

The cutting force is too large.

specification of the chuck.
Supply grease from the grease nipple, and open and close the jaw

Insufficient grease lubrication.

several times without gripping a work.

The rotation speed is too high. Swinging occurs

Lower the rotation speed to a speed at which the required gripping

due to incorrect alignment of cores of workforce can be obtained. Align the cores sufficiently to eliminate

feeder, steady rest, tail stock, etc.

such swinging.

The outer periphery of the chuck is running out.
Dust is attached on the serration part of themaster jaw and the top jaw.

Check the end surface run-out and the outer periphery, andretighten the chuck attachingbolts.

Remove the top jaw, and clean the serration part thoroughly.

The attaching bolt of the top jaw is not tightened

Tighten the top jaw attaching bolt at the specified torque.

sufficiently.

(Refer to page 17)

Precision

The forming method of the soft jaw is

Is the plug for forming parallel to the chuck end surface? Is thefailure.

inappropriate.

plug for forming not deformed due to the gripping force?

The height of the top jaw is too high, the top jaw

Lower the height of the top jaw. (Replace it with the standard size)

is deformed, the top jaw

or check the gripping contact surface and make it uniform.

attaching bolt iselongated.
The gripping force is too large
work being

deformed.

leading to theLower the gripping force in the range possible to process toprevent deformation.

WARNING・If the chuck failed due to a seizure or breakage, remove the chuck from the machine, following the disassembly steps in page
24. When the jaws and covers cannot be removed due to a blockage of workpiece, do not disassemble forcibly but pleasecontact us or our agent.
・If these countermeasures do not correct the problem or improve the situation, immediately stop using the machine.
Continuous use of a broken product or a defective product may cause a serious accident by the chuck or the work flying out.
・Only experienced and trained personnel should do repairs and fix malfunctions. Repair of a malfunction by a person who has
never received instruction from an experienced person, the distributor or our company may cause a serious accident.

7−2 Where to contact in the case of malfunction
In the case of malfunction, contact the distributor where you purchased the product or our branch office listed on the back cover.
25

For Machine Tool Manufactures
Following pages are described for machine tool manufacturers (personnel who attach a chuck to a machine). Please
read following instruction carefully when you attach or detach a chuck to machine, and please sufficiently understandand follow the instructions for safe operation.

8 . Attachment
8−1 Outline drawing of attachment
Lathe rear cover

CylinderCylinder adapter
Top jaw

Draw pipe
Sleeve body

NC latheChuck
Back plate

SupportFlexible hose
Use one with large inside
diameter as possible

Drain hose

Hydraulic pumpPressureadjusting screw

Pressuregauge

Manualswitching valve

Line filter

SOL.

Solenoid
valve

Tank

Return onto the oil surface

Fig. 13
・Attach the manual switching valve at a position where it is easy to operate for the attaching equipment.
・Install the hydraulic unit at a position where the drain hose is not kinked and the needle of the pressure gauge iseasily read.

26

DANGER・When other actuators are operated by the same hydraulic pressure source as the cylinder for chuck, be sure thata pressure drop of the cylinder does not occur during use. A hydraulic pressure drop leads to a drop in thegripping force which could allow the work to fly out.
・As to the drain hose・Use one with inside diameter φ32.
・Use a transparent vinyl hose for visualization.
・Provide a stream slope, without air pocket. This will ensure no back pressure.
・The end of the hose is physically above the oil level. (Refer to Fig.13)
・If the hydraulic oil stagnates inside the cylinder, oil leakage occurs, which may cause a fire.

WARNING・Install after removing the dust inside the pipe completely.
・Add a filter to the pressure supply line. If foreign matters gets inside the cylinder, this is dangerous since therotation valve of the cylinder will seize, the hose will tear off, and the cylinder will rotate. This is also dangerous
as the work will fly out.
・Always use a flexible hose for the hydraulic piping to the cylinder, and the bending force or tensile force of thepipe must not be applied to the cylinder. Use a pipe inside diameter as large as possible and keep the piping
length as short as possible.

NOTICE
・Especially, when a large sized hydraulic unit is used, excessive surge pressure is generated and the gripping
force becomes large, therefore, it may result in breakage of the chuck or the lowering of endurance. Restrain thesurge pressure by adopting a throttle valve, etc.

8−2 Production of draw pipe
Determine the length of the draw pipe as shown below.
Draw pipe

φ0.02

P

Cylinder adapter
L

Cylinder

c

Chuck

d

b

12

Top jaw

a

φ0.05

P

e Min
f Max
φ0.05

A
P

P

Fig. 15

Fig. 14

Table 827

Type

CylinderabcHOH-206

S1246

M55×2.03025HOH-208

S1552

M60×2.03025HOH-10K

S1875

M85×2.03535HOH-12K

Ｓ2091

M100×2.03540HOH-15K

F2511H

M130×2.04540

d (f7)-0.025-0.050-0.03055-0.060-0.03080-0.060-0.03695-0.071-0.043123-0.083
50

e Min

f Max

L

5

M55×2.0

A+60

4

M60×2.0

A+63

5

M75×2.0

A+54

5

Ｍ88×2.0

A+67

6.25

M130×2.0

A+92

The dimension L in Fig. 14 is determined from the distance A between the cylinder adapter and the back plate.
(Example) In the combination of HOH-206, S1246, and when A=800mm, the draw pipe length L is to be
L = A + 60 = 800 + 60 = 860mm.
At the time of the screw process of the dimension a, the precision is to be JIS 6H and 6h, 6g matching the screw of thepiston of the cylinder. Pay attention so that the thread parts on both ends and the inner periphery do not swing or
become unbalanced.

DANGER
・Provide sufficient strength for the draw pipe. If the draw pipe is broken due to insufficiency of the strength, thegripping force will be lost instantly, which is dangerous as the work will fly out.
・Keep the dimension e and the dimension f in Fig. 14 for the draw pipe and a material with the tensile strength2380MPa (38kgf/mm ) or more must be used.
・The personnel who designed draw pipe must judge whether the strength of the draw pipe is sufficient for theusage conditions.
・The dimensions and materials specified in this manual do not guarantee that the draw pipe will not break under
every usage condition.
・If the screw-in depth of the draw pipe to the draw nut is insufficient, the screw will break and the gripping force
will be lost instantly, which is dangerous as the 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.

8−3 Processing of draw nut
1. Remove the socket head cap screw fixing the plunger nut with a hex key, and take out the plunger nut and the draw
nut together.
2. Remove the draw nut from the plunger nut. At this point, pay attention not to lose the steel ball (rigid sphere of φ5)
and the coil spring.
3. Process the draw nut to match the screw of the draw pipe.
4. When assembling, build the draw nut in the plunger nut, turn the draw nut to check the responsiveness of the steelball, and then attach it with the hexagon socket head bolt. If no responsiveness is obtained, assemble it again. Also,tighten the socket head cap screw at the specified torque (Refer to page 29).
Set screw
Coil spring
Steel boll

Process it to match thethread of the draw pipe
Draw nut

Socket head cap screw

Plunger nut
Hex key

The steel boll and the coil spring
existinside the wedge plunger only for 6″

Chuck

Fig. 16WARNING・Do not process the draw nut for screw of the dimensions f MAX specified in Table 8 or more. The draw nut may
break and the work could fly out.

28

DANGER・Always tighten the bolts at the specified torque. If the torque is insufficient or excessive, the bolt will break, whichis dangerous as the chuck or work will fly out.
・Use the bolts attached to the chuck, and do not use other bolts. However, if you must use other bolts notprovided by Kitagawa, use bolts that have at least a strength classification of 12.9 (10.9 for M22 or more) and be
sure they are long enough.

Table 9Bolt size
M5
M6
M8
M10

29

Tightening torque
7.5 N・m13 N・m33 N・m73 N・mBolt size
M12
M14
M16
M20

Tightening torque
107 N・m
171 N・m
250 N・m402 N・m8−4 Attachment of chuck
1．Attaching the draw pipe to the cylinder
・Apply adhesive onto the screw part of the draw pipe, and screw it into the piston rod of cylinder. At this time, refer tothe instruction manual for the cylinder for tightening torque.

NOTICE・When attaching the draw pipe to the cylinder, the stopper pin of the piston may break if tightened at the stroke
middle position of the piston. In the case of a S type cylinder, screw it in so that the piston rod is fully out. Follow
the explanation of the instruction manual for the cylinder for other items about the cylinder.

2. Attach the cylinder to the spindle (or the cylinder adapter)・Check the run-out of the cylinder, and if it is normal, attach the hydraulic pipe.
2・Move 2 to 3 times at low pressure (0.4 MPa-0.5 MPa, 4 - 5 kgf/cm ) and set the piston at the forward end and turn off
the power supply.

CAUTION・Use an eyebolt or a hanging belt
when attaching and detaching thechuck to and from the machine,as there is a danger of injury or
damage if the chuck drops.

Chuck size(inch)
6，8，1012，15

Eyebolt
M10
M12

WARNING・Remove the eyebolt or the belt without fail after using. If the chuck is rotated with the eyebolt, etc., attached, they
may fly out and this is dangerous.

3. Connect the chuck to the draw pipe・Remove the soft jaw and the cover of the chuck, and insert the handle to the chuck center hole, to connect to thedraw pipe while turning the draw nut.
・When connecting the draw nut and the draw pipe, do not forcibly screw them in if they cannot be screwed smoothly,
but check the inclination of the core of the screw, etc.

DANGER・If the screw-in depth of the draw pipe to the draw nut is insufficient, the screw will break and the gripping force
will be lost instantly, which will the work to fly out.
・If the engagement of the screw of the draw pipe is loose, vibration may occur resulting in breakage of the screw,loss of gripping force and the work flying out.

30

4. Attach the chuck matching to the attaching surface of the spindle (or the back plate).
・Turn the handle for connection to make a state that the chuck closely contacts the spindle attaching surface of thelathe.
・In the case of adjusting the centering of the chuck, lightly hit the body side face with a plastic hammer.
・Tighten the chuck attaching bolts evenly. At this time, tighten the bolts at the specified torque.

DANGER・Always tighten the bolts at the specified torque. If the torque is insufficient or excessive, the bolt will break, whichis dangerous as the chuck or work will fly out.
・Use the bolts attached to the chuck, and do not use other bolts. However, if you must use other bolts notprovided by Kitagawa, use bolts that have at least a strength classification of 12.9 (10.9 for M22 or more) and be
sure they are long enough.

Table 10
Bolt size
M5
M6
M8
M10

Tightening torque
7.5 N・m13 N・m33 N・m73 N・mBolt size
M12
M14
M16
M20

Tightening torque
107 N・m
171 N・m
250 N・m402 N・m

5. Adjust the position of the wedge plunger
・The appropriate position of the wedge plunger at the cylinder forward end is the position when the dimension A in
Fig.17 becomes as shown in the table below.
・At this time, check that the reference mark of the master jaw meets the line of the outside of the stroke mark. (Refer topage 17).
・A click stop (rotation stopper) is also attached to the draw nut, so complete adjustment at the position where this
response is felt.
Draw nut

Back plate

HandleSpindleForwardend

Draw pipe
Wedge plunger

A

Chuck attaching bolt

Fig. 17
Table 11Type

HOH-206

HOH-208

HOH-10K

HOH-12K

HOH-15K

A(mm)

20.5

23

15

15

27.5

6. Attach the cover and check the run-out of the chuck・Keep the periphery run-out and the end surface run-out of the chuck at 0.02mm T.I.R or less.
・Full stroke the jaw and check that the reference mark of the master jaw is completely within the entire stroke area
(Refer to page 17).
31

9 . Other Information
9−1 About standards and orders
This product is based on the following standards or orders.
・ Machinery directive : 2006/42/EC Annex I
・ EN ISO 12100 : 2010
・ EN1550 : 1997+A1 : 2008

9−2 Information about markings of product3
Manufacturer's logo
Type oftop jaw

Jaw No.

F MAX：MAX PERMISSIBLE INPUT FORCEΣS MAX：MAX STATIC GRIPPING FORCE
Manufacturer's
N MAX：MAX PERMISSIBLE SPEEDM A S S：MASS
address
Specifications
Type

SB08B1

3

1

MFG. NO.

WAGA
A
E
KITTYP AN
P
JA

3

STA
77- NDARHIR 1 MOT D CH
OS OM UC
HIM AC K
HA
726- I FUC
861 HU
0 J -SH
AP
AN I

Ｆ Ｎ

ΣＳ
F
ΣS MA
X
N MAX ＊＊＊
＊＊ kN
MA MA
SS X＊＊ kN＊＊ ＊/min＊kg

MFG No.
Jaw No.
Stroke mark2

Fig.18

9−3 About disposal
Ultimate disposal of this product should be handled according to all national laws and regulations.

32

https://www.kiw.co.jp
https://www.kitagawa.com
https://www.kitagawa.com.cn

Kitagawa Corporation

Kitagawa Global hand Company

77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan

Tel.＋81-847-40-0561

Fax.＋81-847-45-8911■ JAPAN DOMESTICTokyo office1-405-1,Kita-ku,Yosino-cho,Saitama-shi,Saitama,331-9634,Japan
Tel.＋81-48-667-3469
Fax.＋81-48-663-4678

Sendai office

4-15-13,Yamatomachi,Wakabayashi-ku,Sendai-shi,Miyagi,984-0042,Japan
Tel.＋81-22-232-6732
Fax.＋81-22-232-6739

Nagoya office

2-62,Kamitakabata,Nakagawa-ku,Nagoya-shi,Aichi,454-0873,Japan
Tel.＋81-52-363-0371
Fax.＋81-52-362-0690

Osaka office

3-2-9,Kitakagaya,Suminoe-ku,Osaka-shi,Osaka,559-0011,Japan
Tel.＋81-6-6685-9065
Fax.＋81-6-6684-2025

Hiroshima office77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan
Tel.＋81-847-40-0541
Fax.＋81-847-46-1721

Kyushu office

7-6-39,Itazuke,Hakata-ku,Fukuoka-shi,Fukuoka,812-0888,Japan
Tel.＋81-92-501-2102
Fax.＋81-92-501-2103

Overseas office77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan
Tel.＋81-847-40-0526
Fax.＋81-847-45-8911■ OVERSEASKITAGAWA-NORTHTECH INC.

https://www.kitagawa-usa.com

America Contact
Tel.＋1 847-310-8787

Fax.＋1 847-310-9484

KITAGAWA EUROPE LTD.
Tel.＋44 1725-514000

https://www.kitagawa.global/en

Fax.＋44 1725-514001

KITAGAWA EUROPE GmbHhttps://www.kitagawa.global/de

Tel.＋49 2102-123-78-00 Fax.＋49 2102-123-78-69

KITAGAWA EUROPE GmbH Poland Office
Europe Contact

https://www.kitagawa.global/pl

Tel.＋48 607-39-8855

KITAGAWA EUROPE GmbH Czech Officehttps://www.kitagawa.global/cz

Tel.＋420 603-856-122

KITAGAWA EUROPE GmbH Romania Officehttps://www.kitagawa.global/roTel.＋40 727-770-329

KITAGAWA EUROPE GmbH Hungary Officehttps://www.kitagawa.global/hu

Tel.＋36 30-510-3550

KITAGAWA INDIA PVT LTD.
Tel.＋91-80-2976-5200

https://www.kitagawa.global/in

Fax.＋91-80-2976-5205

KITAGAWA (THAILAND) CO., LTD. Bangkok BranchTel.＋66 2-712-7479

Fax.＋66 2-712-7481

Kitagawa Corporation (Shanghai)
Asia Contact

Tel.＋86 21-6295-5772

https://www.kitagawa.com.cn

Fax.＋86 21-6295-5792

Kitagawa Corporation (Shanghai) Guangzhou OfficeTel.＋86 20-2885-5276

DEAMARK LIMITED
Tel.＋886 2-2393-1221

http://www.deamark.com.tw
Fax.＋886 2-2395-1231

KITAGAWA KOREA AGENT CO., LTD.
Tel.＋82 2-2026-2222

http://www.kitagawa.co.kr

Fax.＋82 2-2026-2113

DIMAC TOOLING PTY. LTD.

https://www.dimac.com.au

Oceania Contact
Tel.＋61 3-9561-6155

Fax.＋61 3-9561-6705

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.

D 2021.11.0000