MA1512PHG2
Version 1.03 (2024.1.6)
Original Instructions

INSTRUCTION MANUALHRS08 typeHigh speed cylinder built-in chuck

Kitagawa Corporation
77-1,Motomachi,Fuchu -shi,Hiroshima,726 -8610,Japan
TEL +81-(0)847 -40-0526
FAX +81-(0)847-45-8911
Before using this product, be sure to read this manual
carefully to understand how to use it correctly.

Contents
1

2
3

Preface2

1.1 How to Use This Manual2

1.2 Signal Word Definition

3

1.3 Type Designation

3

1.4 Application Purpose of This Product4

1.5 Unacceptable Application Example

4

1.6 Structural Drawing

4

1.7 Product Range

5

1.8 Warranty

5

1.9 Parts List

5

Important Safety Precautions

7

Technical Data

11

3.1 Specifications

11

3.2 Calculation of Operating Condition

13

3.3 Relationship Between Gripping Force and Rotational Speed

16

3.4 Relationship Between Gripping Center Height and Static
Gripping Force/Hydraulic Pressure
Relationship Between Moment of Mass of Top Jaw and Loss17

of Gripping Force
Soft Jaw

18

4.1 Installation of Soft Jaw

18

4.2 Stroke mark19

4.3 External Gripping Soft Jaw Forming Procedure20

4.4 Internal Gripping Soft Jaw Forming Procedure21

4.5 Tnut-Plus

22

5

Additional Machining Allowable Range

24

6

Maintenance and Inspection

25

6.1 Periodic Inspection

25

6.2 Grease Supply

25

6.3 Disassembly26

Troubleshooting

27

7.1 Troubleshooting

27

7.2 Contact Information In Case Problem Occurs

28

4

7

1

For Machine Manufacturers
89Installation

29

8.1 Installation Conceptual Diagram

29

8.2 Back plate30

8.3 Pipe31

8.4 Chuck Installation Procedure

32

Others33

9.1 Marking of Product33

9.2 Disposal

33

1. Preface
1.1. How to Use This ManualThis manual provides detailed information on this product so that you can understand its performance andfunctions and use it safely and correctly. Before using this product, be sure to read this manual carefully tounderstand how to use it correctly.

This manual has been prepared for intended use for persons in charge of installation, operation,
inspection, and maintenance of this product. When the beginners use this product, be sure to receive theguidance from skilled persons, sales agents, or us in advance.

Store this manual with care in the specified place at hand, and reread it as necessary for correct use of the
product.

This manual is a part of the product. Do not sell or transfer the product to a third party without attaching
this manual.



Read the section "Important Safety Precautions" at the beginning of this manual especially carefully, whichsummarizes precautions that particularly you should know or follow.



Failure to follow the instructions and warnings in this manual could result in serious human accidents.
Kitagawa shall not be held liable for human accidents, death, damage, or loss that occurred due to a
failure to follow this manual.

This manual does not predict all potential hazards in installation, operation, maintenance, and inspection
under all environmental conditions. Therefore, the matters, unless otherwise mentioned clearly as “can bedone” or “may be done” in this manual, should be considered as “cannot be done” or “must not be done”.

Please contact us or our agents if you have an uncertainty about safety when you try to perform
installation, operation, inspection, or maintenance of the product.



The information and product specifications described in this manual are subject to change without noticefor the purpose of improvement.

21.2. Signal Word Definition
The triangle shown on the left indicates warning. The warning signs are used to alert you topotential safety hazards. To avoid death or injuries that could occur, follow all the instructions
given with the warning signs.
Handling precautions that are considered especially important are classified and indicated as shown below
according to the degree of risk that could result.

DangerFailure to follow the safety precautions below will result in death or serious injuries.

Warning

Failure to follow the safety precautions below could result in death or serious injuries.

CautionFailure to follow the safety precautions below may result in minor or moderate injuries.

NoticeIndicates instructions which, if you do not heed given instructions, could result indamage to the product or shortened service life, or damage to peripheral equipment.

The signs are classified and indicated as follows according to the type of risk.

General warning

Fire warning

Fly-out warning

High temperature warning

Rotating part warning

1.3. Type Designation
Ｈ

Ｒ

Ｓ

０

８

―

HRS chuck

９

９Ａ
Design No.

Chuck size (inch)

Chuck installation shape
Straight : -The chuck installation shapes conform to JIS B
6109-1: 2005 and JIS B 6109-2: 2005.
Figure 1

Type designation

3

Instruction

1.4. Application Purpose of This Product
The High speed cylinder built-in chucks are installed on machine tools such as NC lathes and machining
centers and are suitable for clamping workpieces. The High speed cylinder built-in chucks are equipped withjaws for clamping workpieces, which are opened and closed by the built-in cylinder mechanism. For
applications other than those listed above, please contact us.

1.5. Unacceptable Application Example
The High speed cylinder built-in chuck is not designed for the applications mentioned below for example.
To fix an object to be pressed, punched, welded or fused

To use as a tool holderTo suspend or transfer an object

To fix another chuck that grips a workpiece

1.6. Structural Drawing
The High speed cylinder built-in chuck is installed on the face of the machine spindle and connected to thehydraulic and air circuit by pipes.
The hydraulic pressure applied to the cylinder inside the chuck is converted into thrust that pulls the wedge
plunger. Then the wedge hook actuates the master jaw inward and transfers force to the top jaw.

Figure 2

Structural drawing

41.7. Product RangeThis is the chuck instruction manual.
For the Rotary Joint and other peripheral devices, refer to their respective instruction manuals.

1.8. Warranty
The product is warranted for one year after the date of delivery. However, the following cases will void thewarranty.
When parts other than Kitagawa’s genuine parts are used.

When proper maintenance and inspection such as periodic greasing are not performed.



Other than above, when the product is used in methods not following this manual.

1.9. Parts List
All parts used including consumables shall be genuine parts delivered by Kitagawa.
Kitagawa shall not be held liable for human accidents, death, damage, or loss that occurred due to the use of
non-genuine parts.
Table 1
No.

Parts nameStandard delivery range
QuantityNo.

Parts name

Quantity

1

Body

1

16

Scraper mounting bolt

62

Rear body

1

17

Cover mounting bolt

93

Wedge plunger

118

Adaptor mounting bolt

84Adaptor1

19

Back plate mounting bolt

85Back plate1

20

O-ring

11

6

Lock valve

221

O-ring2

7

Master jaw

3

22

O-ring2

8

Scraper323

O-ring

1

9

Cover

1

24

X-ring1

10

Cover cap

1

25

X-ring1

11

Soft jaw

3

26

X-ring

1

12

T-nut

3

27

Pin

1

13

Jaw mounting bolt

628

Grease nipple

3

14

Chuck mounting bolt

3

29

Screw plug

2

15

Rear body mounting bolt

330

Cover bolt

3

5

No.

Parts name

Table 2

Consumables

HRS08

No.

61R817583

24

X-ring

X119

Parts name

HRS08

6

Lock valve

20

O-ringP6

25

X-ring

X142

21

O-ring

S 10

26

X-ring

X143

22

O-ringS 67

29

Screw plug

JIG01023

O-ring

S 85

30

Cover bolt

MSWGP20-10

Table 3No.
31

Parts nameTnut-Plus

Optional parts (Paid item)
QuantityNo.

3

Figure 3 Parts

6

Parts name

Quantity2. Important Safety Precautions
This chapter summarizes precautions that particularly you should know or follow.
Please read them before starting to use the product.

DangerFailure to follow the safety precautions below will result in death or serious injuries.

Turn off the main power supply of the machine when installing, inspecting, greasing, or
replacing the chuck.
 The chuck may rotate unexpectedly and entangle your body or clothing.
Do not rotate the spindle with the door open.
Provide an interlock to allow spindle rotation only when the door is closed.
 If the door is not closed, the rotating chuck may entangle your body or clothing or cause theworkpiece to fly out.
Do not turn OFF the hydraulic pump or operate the solenoid valve during spindle rotation.
Before performing workpiece transfer during spindle rotation on an opposed 2-spindle lathe,confirm the machine manufacturer that the operation can be performed safely.
 Operating the solenoid valve during spindle rotation will drop or block the hydraulic pressure,causing the gripping force to drop suddenly and the workpiece to fly out.
The rotational speed and hydraulic pressure must not exceed the limit in operation. (Refer to"3. Technical Data")
 Excessive rotational speed may cause the workpiece to fly out.
 Excessive hydraulic pressure may damage the chuck, causing the workpiece to fly out.
Only the machine manufacturer or the user is to determine cutting conditions, gripping force,and rotational speed according to test cutting result. Adjust the hydraulic pressure so as toobtain the gripping force necessary for machining, and confirm that the necessary gripping
force is obtained before starting machining.
 Insufficient gripping force may cause the workpiece to fly out.
If you use a top jaw higher or heavier than the standard top jaw, determine the operating
condition according to "3.2. Calculation of Operating Condition" on page 13.
 Using a top jaw under excessive operating conditions may damage the chuck, causing theworkpiece to fly out.
Chuck should always be used with a supply of hydraulic oil.
 When chuck is used without supply of hydraulic oil, the oil inside the chuck will gradually which
would cause loss of gripping force that would cause the workpiece to fly out.
For internal gripping, use the chuck with 1/2 or less of the max. permissible hydraulicpressure for external gripping.
 Excessive hydraulic pressure may damage the chuck, causing the workpiece to fly out.
When using fixed jaws instead of one or two top jaws, the hydraulic pressure must be 2/3 orless or 1/3 or less of the max. permissible hydraulic pressure.
 Since the hydraulic pressure that is normally applied to three jaws evenly is concentrated in twoor one jaw, the chuck may be damaged, causing the workpiece to fly out.
The gripping diameter must be equal to or less than the body outside diameter.
 Using the chuck with the gripping diameter exceeding the body outside diameter may damage
the chuck, causing the workpiece to fly out.

7

When machining a workpiece with a long protrusion, support it with the steady rest or thetailstock.
 If not, the workpiece may turn at the end, causing the workpiece to fly out.
Do not grip a workpiece with slope shapes or tapered shapes such as a cast.
 Otherwise, the workpiece may slip, causing it to fly out.
If a workpiece or jig causes an unbalance, reduce the rotational speed or correct the state by
mounting a balance weight. The recommended balance quality is G6.3 or less in JIS B
0905:1992.
 An unbalanced workpiece generates centrifugal force, causing the workpiece to fly out.
 Vibration generated by the unbalance may damage the chuck, causing the workpiece to fly out.
Confirm that the chuck or workpiece does not interfere with the cutter or the turret at a low
rotational speed before starting machining.
 A large impact on the chuck or workpiece by interference may damage the chuck, causing thechuck or workpiece to fly out.
If an impact is given to the machine by interference between the chuck/workpiece and thecutter/turret due to malfunction or program errors, immediately stop rotation. Thenthoroughly check for damage or crack on the parts by disassembling and cleaning them andperform repair or replacement if necessary. (Refer to page 26.)
 The impact may cause damage or crack on the parts. Continuous use of faulty parts may
damage the chuck, causing the workpiece to fly out.
Be sure to tighten the bolts with the specified torque listed in Table 4-1 and Table 4-2.
Use a proper tool that can control torque such as a torque wrench.
Use only the bolts attached to the chuck. Do not use other bolts.
 Rotating the chuck with the jaw mounting bolts loosened may cause the jaws and workpiece to
fly out.
 If insufficient bolts are mounted, bolt length is wrong, or tightening torque is improper, the bolts
may be damaged, causing the chuck and workpiece to fly out.
Table 4-1 Specified torque for hex. socket head cap screw
Thread size

M5

M6

M8

M10

M12

M14

M16

M20

M22

M24

Tightening torque [N・m]

7.5

13

33

73

107

171

250

402

539

666

* Strength classification: M20 or smaller = 12.9, M22 or larger = 10.9
Table 4-2 Specified torque for hex. socket button head screw
Thread size

M3

M4

M5

M6

M8

M10

M12

M16

Tightening torque [N・m]

1.4

3.2

6.4

10.8

26.3

52.1

90.9

224

Prevent your hands and fingers from being caught when gripping a workpiece with the chuck.
(To prevent risks, it is recommended to automate the workpiece attaching/detaching
operation.) Otherwise, your hands and fingers may be crushed or cut off.
If any of the abnormalities shown below suddenly occurs during operation, it may be a sign ofdamage of the chuck.


The workpiece slips.

Chattering occurs.



Machining accuracy has become worse.

Machine vibration has been increased.



Chuck gripping force is reduced.

(Gripping force is not increased even by increasing hydraulic pressure.)8If the status is not improved even after taking the measures described on page 26,
immediately stop using the chuck.
Continuous use of faulty parts may damage the chuck, causing the workpiece to fly out.

Warning

Failure to follow the safety precautions below could result in death or serious injuries.

Perform additional machining of tapped holes and pin holes on the chuck only within theallowable range. (Refer to page 24.)
 Additional machining performed out of the allowable range may damage the chuck, causing theworkpiece to fly out.
 Especially, additional machining to the master jaws and T-nut directly causes fly-out of theworkpiece.
Supply grease every day.
When supplying grease, turn OFF the machine main power and be sure to use the specified
grease. (Refer to page 25.)
 Insufficient greasing or use of grease other than the specified one may drop the gripping force,
causing the workpiece to fly out.
Disassemble and clean the chuck every six months or 100,000 strokes (cast machining: every
two months). (Refer to page 26.)
 Omitting the disassembly and cleaning and use of the chuck with chips and coolant remaining
inside the chuck will lead to insufficient stroke and gripping force drop, causing the workpiece to
fly out.
Remove the eye bolts and wrench from the chuck after use.
 Rotating the chuck without removing the eye bolts and wrench may cause them to fly out.
Use rustproof coolant.
 Otherwise, rust that will be formed inside the chuck may drop the gripping force, causing theworkpiece to fly out.
When stopping the machine for a long time or when storing the chuck without using it for along period, supply grease and rustproof them beforehand.
 Otherwise, rust that will be formed inside the chuck may drop the gripping force, causing theworkpiece to fly out.
Do not wear clothing or accessories such as gloves and necktie which are easy to be caughtin.
 Otherwise, your body or clothing may be entangled.
Do not perform the work after drinking alcohol or taking medicine.
 Impaired judgment or operation mistake may cause serious hazards.

CautionFailure to follow the safety precautions below may result in minor or moderate injuries.

Do not touch machined workpieces with bare hands. (To prevent risks, it is recommended toautomate the workpiece attaching/detaching operation.) Touching workpieces with bare hands may cause a burn because the workpieces may be veryhot.
Remove the workpiece from the chuck when stopping the machine for a long time.
 Failure to do so may lead to drop or interruption of hydraulic pressure or malfunction of thebuilt-in cylinder, causing the workpiece to drop.

9

When attaching/detaching the chuck to/from the machine, use appropriate lifting devices
such as eye bolts and a floor-operated crane.
 Lifting a heavy chuck by hands will cause a backache.
 Slipping and dropping the chuck from hands may result in a bruise.
Supply hydraulic oil and operate the chuck several times without gripping the workpiece
when the power is on.
 A sudden increase in pressure increases the gripping force and may cause deformation of theworkpiece.

10

3. Technical Data
3.1. Specifications
Table 5 Specification table
Type

HRS08

mm

5.5

Max. permissible speed

min-1

3000

Max. static gripping force

kN

38.3

Max. permissible hydraulic pressure

MPa

5.0

Dynamic gripping force at max. speed

kN

23.4

Gripping range

mm

φ45～φ222

Max. static gripping force

kN

13.9

Max. permissible hydraulic pressure

MPa

2.5

kg

28.5

kg・m2

0.18

External gripping

Jaw stroke (in diameter)

Internal gripping

Mass *1
Moment of inertia *2Standard soft jaw type

SJ06B1

Tnut-Plus type (option)

TN06PLUS

Balance quality of chuck body *3

JIS B 0905 : 1992

Storage temperature / operating temperature *4-20～+50℃/

G6.3-10～+40℃*1 : The mass is a value when the standard soft jaws and chuck mounting bolts are included.
*2 : The moment of inertia is obtained by including the standard soft jaws and chuck mounting bolts.
Here, the soft jaws are mounted to the position protruding outward from the master jaws by a half pitch at
the center of the jaw stroke.
*3 : The balance quality of the chuck body is a value when the soft jaws, T-nut, and jaw mounting bolts are notincluded.
*4 : When storing the product, it should be subjected to the antirust treatment and stored in a place free fromwetting, condensation, or freeze.

11The max. static gripping force in the specifications is the value to be obtained under the following conditions.


At the max. permissible hydraulic pressureKitagawa's standard soft jaws are used.

The soft jaw mounting bolts are tightened to the specified torque. (Refer to page 8.)

The gripping meter is gripped at the center of the jaw stroke and the soft jaws are attached at the position
where the distance between the jaw mounting bolt and the master jaw is 9.25 mm.



The gripping force is measured by the Kitagawa's gripping meter, and the height of the gripping position is
as shown in Figure 4. (Also refer to Table 6)

The specified grease is used. (Refer to page 25.)



A variable capacity type pump having a delivery capacity of 20 L/min or more is used as the hydraulicpressure source.

one jaw

The pressure is set by the regulator of the pump or that separately provided.

Pressing force permax. permissible
hydraulic pressure(built-in cylinder thrust)Figure 4

Gripping force measuring method* The gripping meter indicates the pressing force per one jaw. The gripping force is the total of the pressing
forces of all jaws.

123.2. Calculation of Operating Condition
Table 6

Symbols for calculation and the meanings
Meaning

SymbolHRS08

𝐻oGripping center height in specifications

mm

18

𝐻

Gripping center height in operation

mm

-

𝐻T

Top surface height of standard soft jaw

mm

33

𝐻max

Gripping part center limit height (recommended value)mm

60

𝐹g maxMax. static gripping force

External gripping

kN

38.3

Internal gripping

kN

13.9

𝐹gH

Static gripping force with 𝐻 at max. permissible input force

kN

-

𝐹g

Static gripping force in operation

kN

-

𝐹gD

Dynamic gripping force in operation

kN

-

kN

14.7

kN

4.6

External gripping

𝑄max

Max. permissible input(hydraulic pressure :5.0MPa)

force

Internal gripping(hydraulic pressure :2.5MPa)

𝑄

Input force in operation

kN

-

𝑚o

Mass of one standard soft jaw

kg

0.424

𝑚

Mass of one top jaw used

kg

-

𝑟o

Gravity radius of standard soft jaw

mm

73.6

𝑟

Gravity radius of top jaw used

mm

-

𝑧

Number of jaws

3Max. permissible speed

min-1

3000

Rotational speed in operation

min-1

-

Loss of gripping force at max. permissible speed

kN

14.9

𝐹c

Loss of gripping force at rotational speed during operation

kN

-

𝛥𝐹c

Loss of gripping force of moment of mass increase

kN

-

𝑛max
𝑛
𝐹c max𝐴
𝐵

𝑃𝑐 𝑚𝑎𝑥260

Coefficient specific to each type23

Max. permissible hydraulic pressure

13

MPa

5.0

3.2.1. Calculation of Static Gripping Force at Gripping Center Height 𝐻
The gripping center height is the distance from the mechanical center point of the gripping force acting on
the workpiece to the chuck surface.
When the gripping surfaces of the top jaws contact the workpiece evenly, the mechanical center point of thegripping force is at the center of the gripping surface. If the gripping surfaces contact unevenly or estimationof the gripping center height is difficult, the gripping force should be calculated using the distance from the
top jaw top surface to the chuck surface so as to give priority to safety.
When the gripping center becomes higher, the static gripping force is decreased even if the hydraulicpressure is the same.



If the gripping center height is higher than, load to be applied to the master jaws, T-nuts, and jaw
mounting bolts will increase. To prevent these parts from being damaged, the hydraulic pressure must
be reduced to suppress the gripping force to a low level.



It is recommended to adjust the gripping center height to be 𝐻𝑚𝑎𝑥 or less.

𝐹gH

𝐹g maxStandard soft jaw

𝐻o

Top jaw used

Mechanical center point ofgripping force

𝐻T(If it is unknown whether the𝐻gripping surfaces contact
evenly, calculate the gripping
force using the top jaw top
surface position.)

Figure 5

𝐻 when 𝐻𝑇 is or less
𝐹gH = 𝐹g𝑚𝑎𝑥 ×Gripping center height𝐻o + 𝐴
𝐻+𝐴

𝐻 when 𝐻𝑇 is more than𝐹gH = 𝐹g 𝑚𝑎𝑥 ×

𝐻o + 𝐴 𝐻T + 𝐵
×
𝐻+𝐴
𝐻+𝐵

14

3.2.2. Calculation of Loss of Gripping Force due to Centrifugal ForceCentrifugal force is produced on the jaws during chuck rotation. It acts in the direction reducing the gripping
force especially in external gripping. This is called "loss of gripping force due to centrifugal force".
Loss of gripping force due to centrifugal force is proportional to the square of the rotational speed, andthorough consideration is necessary especially for high speed rotation. In addition, a larger mass or gravity
radius of the top jaws will increase loss of gripping force due to centrifugal force.

𝑚

𝑟o

𝑟

𝑚o

Standard soft jaw

Figure 6

Top jaw used

Loss of gripping force due to centrifugal force𝑚 × 𝑟 when 𝑚o × 𝑟o is more than
2×𝜋×𝑛 2𝛥𝐹c = 𝑧 × (𝑚 × 𝑟 − 𝑚o × 𝑟o ) × () × 10−660𝐹c = 𝐹c max ×𝑛2
𝑛𝑚𝑎𝑥 2+ 𝛥𝐹c

𝑚 × 𝑟 when 𝑚o × 𝑟o is or less𝐹c = 𝐹c max ×

𝑛2
𝑛𝑚𝑎𝑥 23.2.3. Determination of Gripping Force
Determine 𝐹𝑔 in consideration of gripping force loss due to centrifugal force and necessary operating
conditions such as cutting conditions, workpiece distortion, and strength of the top jaws. However, 𝐹𝑔 must
be 𝐹𝑔𝐻 or less. The dynamic gripping force during rotation 𝐹𝑔𝐷 is calculated as indicated below.
For external gripping
𝐹gD = 𝐹g − 𝐹cFor internal gripping
𝐹gD = 𝐹g + 𝐹c

（ 𝐹gD ≦ 𝐹gH ）15

3.2.4. Calculation of Input Force for Operation
Calculate the input force required to obtain the necessary gripping force.



𝐻 when 𝐻𝑇 is or less
𝑄 = 𝑄max ×



𝐹g
𝐹gH

𝐻 when 𝐻𝑇 is more than
𝑄 = 𝑄max ×𝐹g
𝐻T + 𝐵×
𝐹gH 𝐻 + 𝐵

3.2.5. Calculation of Hydraulic Pressure in Operation
Calculate the hydraulic pressure to be applied to the built-in cylinder to obtain the necessary input force.

𝑃 = (𝑃c max − 0.25) ×𝑄𝑄max+ 0.25

When the hydraulic pressure in operation is less than 0.5 MPa, the cylinder may not operate or the operation
speed may become extremely slower.
In this case, it is necessary to increase the hydraulic pressure.

3.3. Relationship Between Gripping Force and Rotational Speed
The graphs in Figure 7 indicate the relationship between the gripping force in each moment of mass of the top
jaw and the rotational speed. They can be used for approximate calculation of operating conditions.

Figure 7

16

HRS08

3.4. Relationship Between Gripping Center Height and Static Gripping Force / HydraulicPressure
Relationship Between Moment of Mass of Top Jaw and Loss of Gripping Force
The graphs in Figure 8 indicate the relationship between the gripping center height and the static gripping
force/hydraulic pressure, and the relationship between the moment of mass of the top jaw and the loss ofgripping force, respectively. They can be used for approximate calculation of operating conditions.
How to read the graphs is explained below taking HRS08 for example.
When the gripping center height is 18mm and the hydraulic pressure is 5 MPa, the gripping force is 38.3
kN.



If the gripping center height exceeds 33 mm, the hydraulic pressure must be reduced. For example, when
the gripping center height is 50 mm, the hydraulic pressure is limited to 3.8 MPa or less.



It is recommended to use the chuck with the gripping center height adjusted to 60 mm or less.



According to JIS B 6150 : 2015, the loss of gripping force due to centrifugal force must not exceed 2/3(67%) of the actual static gripping force. Therefore, the permissible loss of gripping force is 25.5 kN when
the static gripping force is 38.3 kN.

The loss of gripping force due to centrifugal force is 14.9 kN when the moment of mass of the top jaw is
93.6 kg・mm and the rotational speed is 3000 min-1.

Figure 8

17

HRS08

4. Soft Jaw
4.1. Installation of Soft Jaw
The soft jaw mounting positions can be adjusted by loosening the jaw mounting bolts and changing theserration engaging position with the master jaws.

DangerFailure to follow the safety precautions below will result in death or serious injuries.

Use the T-nut in a state where it does not protrude from the master jaw circumference side
end face.
If not, the master jaws and T-nut may be damaged, causing the jaws and workpiece to fly out.



T-nut
T-nut

T-nut must not
protrudefrom

this face.

Master jaw

Correct

Wrong
Figure 9

Do not use soft jaws as follows.

Soft jaws manufactured by other companiesWith serration pitch different from that of master jaw

Soft jaws joined by welding

If serration engagement is faulty, the master jaws may be deformed and the gripping force isreduced, or the soft jaws may be damaged due to insufficient strength, causing the workpiece to
fly out.

NoticeIndicates instructions which, if you do not heed given instructions, could result in damage
to the product or shortened service life, or damage to peripheral equipment.

When replacing the soft jaws, carefully clean fitting parts of the serration and the T-nuts.
Insufficient cleaning will lead to an accuracy failure.

Set the hydraulic pressure according to the shape and cutting conditions of the workpiece.
Clamping a pipe-shaped workpiece with a high gripping force may deform it.

18

4.2. Stroke markA stroke mark to check the jaw stroke position is stamped on the No. 1 jaw part on the body.
When the jaw is at the open end, the base line of the master jaw is aligned with the outer line of the full stroke
range as shown in Figure 10.
The base line moves across the full stroke range when the jaw is opened / closed. However, the base line must
be within the appropriate stroke range when the chuck grips a workpiece.

Figure 10

Stroke mark

Table 7
Type

HRS08

Appropriate stroke range

1[mm]DangerFailure to follow the safety precautions below will result in death or serious injuries.

When gripping a workpiece, the master jaw base line must be within the appropriate stroke
range.


Gripping a workpiece near the stroke end may fail due to unevenness of the tolerance at theworkpiece gripping part, causing the workpiece to fly out.

Frequently gripping a workpiece near the stroke end will apply excessive force to the masterjaws and lead to damage of the chuck, causing the workpiece to fly out.

Before starting work, open and close the jaws without gripping a workpiece and confirm thatthe master jaw base line moves within the full stroke range.


If the jaw stroke becomes insufficient due to chips accumulating inside the chuck or looseneddraw nut, the chuck may not grip the workpiece, causing the workpiece to fly out.

19

4.3. External Gripping Soft Jaw Forming Procedure①

Preparation of disc for finish turning of top jaw

The disc for finish turning of top jaw must have a thickness not to be
distorted with the surface roughness of about 25 s.
It is convenient to prepare several types of discs with different
outside diameters so as to use them properly according to thedimension of the forming part.



It is convenient to cut threads at the center in order to guide thedisc using a bolt when gripping the disc.

②

Machining of disc gripping part

Unclamp the chuck and open the jaws to the maximum.
Next, machine D1. D1 must be the dimension that can grip the discnear the center of the jaw stroke.
𝐷1 = 𝑑 +③

jaw stroke
2

Gripping of disc

Grip the disc at the D1 part.


Grip the disc while pressing against the chuck front face toprevent it from tilting. Stabilize the disc by gripping it several
times.

Confirm that the master jaw base line is within the appropriate
stroke range when the disc is gripped. (Refer to page 19.)④

Forming

Machine D2 with the disc gripped.
D2 must be the same as the workpiece diameter (approx. H7) and thesurface roughness must be 6.3 s or less.


Set the hydraulic pressure during forming to equal to or slightly
higher than that during machining a workpiece.



If the disc becomes deformed, reduce the hydraulic pressure orchange the disc shape to the one that is hardly deformed.

⑤

Test cutting

Remove the disc and grip a workpiece.


Confirm that the master jaw base line is within the appropriate
stroke range when the workpiece is gripped. (Refer to page 19.)

Perform test cutting to confirm that the desired machining
accuracy is obtained and no slip occurs.

Grip the workpiece so that it is brought into contact with thegripping surface A and B.

20

4.4. Internal Gripping Soft Jaw Forming Procedure①

Preparation of ring for finish turning of top jaw

The ring for finish turning of top jaw must have a thickness not to be
distorted with the surface roughness of about 25 s.
It is convenient to prepare several types of rings with different
inside diameters so as to use them properly according to thedimension of the forming part.

②

Machining of ring gripping part

Unclamp the chuck and close the jaws to the minimum.
Next, machine D1. D1 must be the dimension that can grip the discnear the center of the jaw stroke.
𝐷1 = 𝑑 −③

jaw stroke
2

Gripping of ring

Grip the ring at the D1 part.


Grip the ring while pressing against the jaws to prevent it fromtilting. Stabilize the ring by gripping it several times.

Confirm that the master jaw base line is within the appropriate
stroke range when the ring is gripped. (Refer to page 19.)④

Forming

Machine D2 with the ring gripped.
D2 must be the same as the workpiece diameter (approx. h7) and thesurface roughness must be 6.3 s or less.


Set the hydraulic pressure during forming to equal to or slightly
higher than that during machining a workpiece. For internal
gripping, use the chuck with 1/2 or less of the max. permissible
input force for external gripping.



If the ring becomes deformed, reduce the hydraulic pressure orchange the ring shape to the one that is hardly deformed.

⑤

Test cutting

Remove the ring and grip a workpiece.


Confirm that the master jaw base line is within the appropriate
stroke range when the workpiece is gripped. (Refer to page 19.)

Perform test cutting to confirm that the desired machining
accuracy is obtained and no slip occurs.

Grip the workpiece so that it is brought into contact with thegripping surface A and B.

21

4.5. Tnut-Plus
A Tnut-Plus as shown in Figure 11-1 is provided for HRS08 chucks as an option.
Soft jaws formed using the Tnut-Plus can maintain the gripping accuracy equivalent to just-formed soft jaws
even after they are removed from the chuck once, because they can be reinstalled in the same positions.


For corresponding Tnut-Plus types, refer to Table 5.



To maintain the installation repeatability of the Tnut-Plus for a long period of time, always tighten the jaw
mounting bolts from the chuck outside diameter side ① with the specified torque. (See Figure 11-2)

The Tnut-Plus is elastically deformed when the bolts are tightened. Therefore, the resistance you feel
when tightening the bolts is different from ordinary T-nuts, it is normal.



If the Tnut-Plus is used for a long period of time, the soft jaws may be fixed and become hard to be
removed. In this case, remove them by tapping with a plastic hammer. Apply CHUCK GREASE PRO to
the side of the T-nut to stop it becoming fixed.

The gripping accuracy may be deteriorated due to aging such as fatigue of the workpiece gripping surface.
In such a case, re-form the soft jaws.
Chuck outside diameter side

Chamfer
Chuck inside diameter side
Figure 11-1

Tnut-Plus

Figure 11-2 Tightening order of the jaw mounting bolts

22

Warning

Failure to follow the safety precautions below could result in death or serious injuries.

Mount the Tnut-Plus with the chamfer side facing the chuck inside diameter side. (See Figure11-1)
If it is mounted in the opposite direction, seizure may occur due to significant deformation of themaster jaws. As a result, the gripping force will be reduced, causing the workpiece to fly out.
Do not use the Tnut-Plus on a chuck that does not correspond to it.
(The T-slot shapes of such chucks do not match the Tnut-Plus, so the Tnut-Plus cannot bemounted physically. Do not use the Tnut-Plus forcedly on such chucks by additionallymachining them.)
If the Tnut-Plus is used on such chucks, seizure may occur due to significant deformation of themaster jaws. As a result, the gripping force will be reduced, causing the workpiece to fly out.
Additional machining of the T-nut and master jaws may damage them, causing the workpiece to

fly out.
Do not use soft jaws manufactured by other companies.
If soft jaws manufactured by other companies are used, seizure may occur due to significant



deformation of the master jaws. As a result, the gripping force will be reduced, causing theworkpiece to fly out.
Using soft jaws manufactured by other companies may damage the T-nut, causing theworkpiece to fly out.

NoticeIndicates instructions which, if you do not heed given instructions, could result in damage
to the product or shortened service life, or damage to peripheral equipment.

Do not use soft jaws manufactured by other companies.
When mounting already-formed soft jaws again, use the same T-nut used when the soft jaws wereformed, match the jaw No. of the soft jaws and master jaws, and mount the soft jaws in the sameserration position. Also, carefully clean fitting parts of the serration and the T-nuts.


Failure to follow the above precautions may lead to poor accuracy.

23

5. Additional Machining Allowable Range
When mounting a locator or jig on the body surface, add tapped holes and pin holes within the additional
machining allowable range shown by the oblique line parts in Figure 12.

Figure 12

Additional machining allowable range

Table 8
Type

HRS08

A

35

B

67

C (max)

18.5

R

5
[mm]

DangerFailure to follow the safety precautions below will result in death or serious injuries.

Provide measures to prevent fly-out by centrifugal force (such as dowel pins) for the locator
or jig. In addition, mount the locator or jig with enough bolts with sufficient strength.
Otherwise, the locator or jig may fly out due to centrifugal force.

24

6. Maintenance and Inspection
6.1. Periodic Inspection
Table 9Periodic inspection

Interval

ContentsSupply grease. When using high speed rotation or a large quantityof water soluble coolant, shorten the greasing interval according tothe operating conditions.

Every day

Before starting work, open and close the jaws without gripping aworkpiece and confirm that the master jaw base line moves within
the full stroke range. (Refer to page 19.)

Every 3 months
Every 6 months or 100,000 strokes(Cast machining: every 2 months)

Upon completion of the work, clean the chuck using an air gun.

Check the bolts of each part for looseness.

Disassemble and clean the chuck.(Refer to page 26.)

6.2. Grease Supply
6.2.1. Specified grease
Table 10
Type

Specified grease

HRS08

CHUCK GREASE PRO

Specified grease
Grease nipple

JIS B 1575 : 2000
type 1 (M6×0.75)

Grease amount per one point [g]66.2.2. Greasing Procedure①

Open the jaws, and be sure to turn OFF the main power of the machine before starting the work.

②

Supply the amount of grease shown in Table 10 from the grease nipple of each master jaw using agrease gun.

③

After supplying the grease, open and close the jaws several times without gripping the workpiece.

6.2.3. Safety Information on Grease and Antirust Oil
Applicable rangeSpecified greaseAntirust agent applied to the product at the delivery

For the grease other than the specified one and antirust oil prepared by the customer, refer to the safety data
sheet (SDS) prepared for respective oils.

25Table 11 First-aid treatment
In case of much aspiration, go to a place where there is fresh air, and cover yourAspirationbody with a blanket to keep your body warm. Consult a doctor if necessary.
Wipe off the oil, and wash your skin with water and soap.

Sticking to your skin

If you feel itchy or you get inflamed, consult a doctor immediately.

Entering your eye

Wash your eye with fresh water for at least 15 minutes, and then consult a doctor.

Accidental drinking

Consult a doctor immediately without vomiting forcibly.

6.3. Disassembly
Read the following disassembling procedure referring to page 5 and 6.
①

Before start of work, be sure to turn off the main power of the machine.

②

Loosen the jaw mounting bolts [13] and remove the soft jaws [11] and T-nuts [12] from master jaw [7].

③Loosen the scraper mounting bolts [16] and remove the scraper [8] from master jaw [7]④Loosen the cover mounting bolts [17] and remove the cover [9] from body [1].

⑤Remove the cover bolts [30]. Loosen the chuck mounting bolts [14] and remove the chuck from back plate [5]⑥Loosen the adaptor mounting bolts [18] and remove the adaptor [4] from rear body [2]⑦Loosen the rear body mounting bolts [15] and remove the rear body [2] from the body [1].

⑧

Remove the wedge plunger [3] toward the rear of the chuck.

⑨

Remove the master jaws [7] toward the inner circumference of the chuck.



Reassemble the product through reverse procedure of disassembly while applying the specified greasesufficiently.

When reinstalling the chuck to the machine, refer to "8.4 Chuck Installation Procedure".

After reassembly, it is recommended to confirm that the specified gripping force is obtained according to
the procedure on page 12.

DangerFailure to follow the safety precautions below will result in death or serious injuries.

Clean the disassembled parts with kerosene, carefully check them for damage, wear, crack, orseizure, and repair or replace them if necessary.
NoticeContinuous use of faulty parts may damage the chuck, causing the workpiece to fly out.

Indicates instructions which, if you do not heed given instructions, could result in damage
to the product or shortened service life, or damage to peripheral equipment.

Reassemble the parts with the jaw numbers marked on the body, wedge plunger, and master jaws
matched respectively.

26

Also, do not hit the parts each other or give a shock to them. Be especially careful not to hit the bodywhen installing the master jaw.
Failure to observe the precautions may result in accuracy failure.

7. Troubleshooting
7.1. Troubleshooting
If a failure is suspected, check the contents in Table 12 again and take necessary measures.
Table 12
Problem

Cause
Parts are damaged

Jaws donot move

Slideways get seized
Hydraulic pressure does not
supplied

Stroke isinsufficient

Troubleshooting

Chips accumulate inside

Countermeasure
Disassemble and clean the chuck. Replace damaged parts.
(Refer to page 26.)
Disassemble and clean the chuck. Correct the seized partwith an oilstone or replace the part.

(Refer to page 26.)

Check the piping and electric system, and if normal.

Disassemble and clean the chuck. (Refer to page 26.)
Confirm that the master jaw base line is within the

Jaw stroke insufficientappropriate stroke range when a workpiece is gripped.
(Refer to page 19.)

Lack of gripping force
The formed diameter of the top
jaw does not match theWorkpiece
slips

workpiece diameter
Excessive cutting force
Lack of grease
Excessive rotational speed

Confirm that the hydraulic pressure is appropriate.
Re-form the jaw according to the correct forming method.
(Refer to "4. Soft Jaw")
Calculate cutting force and check that it is appropriate for thechuck and machine specifications.
Supply grease. (Refer to page 25.)
Slow down the rotational speed to obtain required gripping
force.

Swing due to misalignment of
the bar feeder, steady rest,

Thoroughly conduct alignment to eliminate swing.

tailstock, etc.
Run-out of chuck circumference

Adjust the run-out to 0.020 mm T.I.R. or less.

Accuracyis large

failureDust accumulates in serration

Remove the top jaws and thoroughly clean the serration

parts of master jaw and top jaw

parts.

27

Jaw mounting bolts are not

Tighten the jaw mounting bolts with the specified torque.

sufficiently tightened(Refer to page 8.)

Top jaw forming method isimproperDue to excessive top jaw height,
top jaws are deformed and jaw
mounting bolts are extended

Confirm that the disc for finish turning of top jaw is parallel tothe chuck end face and it is not deformed by the gripping
force.
Lower the top jaw height. Adjust the top jaws so that thegripping surfaces contact the workpiece evenly.

Excessive gripping force

Reduce the gripping force to the extent that machining candeforms workpiece.

be executed to prevent deformation.

7.1.1. Aging of markings due to use
The type and serial numbers marked on the surface of the body may become difficult to see due to prolonged
exposure to chips. Also, the logo plate (blue K mark) is strongly adhered to the body with adhesive, but for thesame reason, it may be scratched or peeled off. If it should peel off, it will not affect performance or safety. This
is not a malfunction, so please use the product with peace of mind.

DangerFailure to follow the safety precautions below will result in death or serious injuries.

In case that the chuck failed to operate due to a seizure or breakage, remove the chuck fromthe machine following the disassembly procedure on page 26. When the top jaws and covers
cannot be removed due to a blockage of workpiece, do not disassemble forcibly but pleasecontact us or our agent.
Forcible disassembly could cause serious human accidents.

The chuck must be repaired only by skilled persons who have received the training course.


Repair by unskilled persons or persons other than us or our agents could cause serious humanaccidents.

7.2. Contact Information In Case Problem Occurs
Please get in touch with our sales agent from which you purchased the chuck or our office of the address givenon the back cover when the chuck fails.

28

For Machine Manufacturers
The sections starting from this page provide explanations for machine manufacturers (who mount the chuck on
machines).
Not only machine manufacturers but also persons who attach/detach the chuck are to read and thoroughly
understand the contents so as to perform safety work.

8. Installation
8.1. Installation Conceptual Diagram

Figure 13

Installation conceptual diagram

Table 13 Adaptor port

Dangerport

size [mm]A

hydraulic pressure supply port (Close side)

φ9B

hydraulic pressure supply port (Open side)φ9C

air circuit

φ9D

unusedφ9

Failure to follow the safety precautions below will result in death or serious injuries.

Confirm that the cylinder does not cause pressure drop during machining beforehand when
operating other actuators together with the cylinder using the same hydraulic source.
Reduction of hydraulic pressure will reduce the gripping force, causing the workpiece to fly out.

29

Notice

Indicates instructions which, if you do not heed given instructions, could result in damage
to the product or shortened service life, or damage to peripheral equipment.

Especially when using a large hydraulic unit, insert a throttling valve in the pressure supply line torestrict surge pressure.
An excessive surge will shorten the chuck service life.

8.2. Back plate
Use the back plate supplied with the chuck.
The chuck mounting dimensions conform to JIS B 6109-2: 2005.

Figure 14 Mounting dimensions

NoticeIndicates instructions which, if you do not heed given instructions, could result in damage
to the product or shortened service life, or damage to peripheral equipment.

The end face run-out and fitting diameter run-out of the back plate must be 0.005 mm T.I.R. or less,respectively. (It is also allowed to mount the back plate on the machine and finish the end face andfitting diameter in this state.)

Excessive back plate run-out may result in accuracy failure.

30

8.3. Pipe
Whether sufficient strength is obtained with respect to the operating conditions must be judged by the designerof the pipe. The dimensions provided in this manual do not guarantee that the pipe will not be damaged under
every condition.

Figure 15

Distance between chuck mounting face and spindle mounting face

Table 14

Pipe dimensions

Type

A

B

C

D

E

HRS08

φ9

10.5

70°

70°

φ26
[mm]

8.4. Chuck Installation Procedure①

Before start of work, be sure to turn off the main power of the machine.

②

Provide a pipe with adjustable port phase.

③

Remove the soft jaws, cover and scraper of the chuck.

④

Connect the pipe and adaptor until the chuck is completely fitted to the spindle installation surface.

⑤

Tighten the chuck mounting bolts evenly with the specified torque. (See “2.Important Safety Precautions”)
The chuck circumference run-out must be 0.020 mm T.I.R. or less. When performing centering adjustment,
tap the body side face with a plastic hammer.

31

⑥Turn on the machine power, and operate the chuck several times at 0.5 MPa, and confirm that is noabnormality.

⑦

If its normal, confirm that the master jaw base line moves within the full stroke range. (Refer to page 19.) If
it does not move for the whole full stroke range, loosen the screw plug (See Figure 16) and vent the air.

Figure 16

Warning

Failure to follow the safety precautions below could result in death or serious injuries.

When replacing a hydraulic pressure equipment, consult the machine manufacturer for
installation.
Insufficient gripping force may cause the workpiece to fly out.

NoticeIndicates instructions which, if you do not heed given instructions, could result in damage
to the product or shortened service life, or damage to peripheral equipment.

Tighten the chuck mounting bolts evenly with the specified torque. (Refer to page 8.)

If the tightening torque is insufficient, will increase the gap between body and master jaw. Failure
to follow the above precautions may lead to poor accuracy and will shorten the chuck service
life.

32

9. Others
9.1. Marking of ProductFigure 17

DangerMarking

Failure to follow the safety precautions below will result in death or serious injuries.

Markings are standard specifications. Since specifications may be limited due tospecification changes or modifications, refer to the delivery specifications, if available. If
there are no delivery specifications, such as for changes to the jaws by the customer,
determine the operating condition according to "3.2. Calculation of Operating Condition".



If the mass of the jaws is large, the centrifugal force will increase and the gripping force will
decrease, may cause the workpiece to fly out.
Excessive rotational speed may cause the workpiece to fly out.



Excessive hydraulic pressure may damage the chuck, causing the workpiece to fly out.



9.2. Disposal
Dispose of this unit in accordance with the laws and regulations of your country.

33

34

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

Kitagawa Corporation

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