Kitagawa BR06, BR08, BR10, BR12 Instruction Manual

MA1208PHG

Version 1.07 (2020.10.10)

Original Instructions

INSTRUCTION MANUAL

BR type (BR06, 08, 10, 12)

Standard Chuck

Kitagawa Corporation

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

TEL [phone]
FAX [phone]

Before using this product, be sure to read this manual

carefully to understand how to use it correctly.

Contents

1 Preface

2

1.1 How to Use This Manual

2

1.2 Signal Word Definition

3

1.3 Type Designation

3

1.4 Application Purpose of This Product

4

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

2 Important Safety Precautions

7

3 Technical Data

11

3.1 Specifications

11

3.2 Calculation of Operating Condition

13

3.3 Relationship Between Gripping Force and Rotational Speed

17

3.4 Relationship Between Gripping Center Height and Static

Gripping Force/Input Force
Relationship Between Moment of Mass of Top Jaw and Loss
of Gripping Force

17

4 Soft Jaw

20

4.1 Installation of Soft Jaw

20

4.2 Stroke mark

21

4.3 External Gripping Soft Jaw Forming Procedure

22

4.4 Internal Gripping Soft Jaw Forming Procedure

23

4.5 Tnut-Plus

24

5 Additional Machining Allowable Range

26

6 Maintenance and Inspection

27

6.1 Periodic Inspection

27

6.2 Grease Supply

27

6.3 Disassembly

28

7 Troubleshooting

29

7.1 Troubleshooting

29

7.2 Contact Information In Case Problem Occurs

30

1

For Machine Manufacturers

8 Installation

31

8.1 Installation Conceptual Diagram

31

8.2 Back plate

33

8.3 Draw Pipe

34

8.4 Disassembly of Draw Nut and Threading

35

8.5 Chuck Installation Procedure

35

9 Others

36

9.1 Standard or Directive to Conform

36

9.2 Marking of Product

37

9.3 Disposal

38

1. Preface

1.1. How to Use This Manual

 This manual provides detailed information on this product so that you can understand its performance and

functions and use it safely and correctly. Before using this product, be sure to read this manual carefully to
understand 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 the
guidance 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, which

summarizes 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 be

done” 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 notice

for 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 to
potential safety hazards. To avoid death or injuries that could occur, follow all the instructions
given with the warning signs.

Danger

Failure 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.

Caution

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

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.

Ｂ Ｒ ０ ８ Ａ ６ ９ ９ Ａ

BR chuck

Chuck size (inch)

A2-15 : K5

Design No.

Handling precautions that are considered especially important are classified and indicated as shown below
according to the degree of risk that could result.

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 Instruction

1.3. Type Designation

The chuck installation shapes conform to JIS B
6109-1: 2005 and JIS B 6109-2: 2005.
However, only A2-15 (former standard)
conforms to JIS B 6109: 1963.

Chuck installation shape
Straight : -

A2-5 : A5

A2-6 : A6
A2-8 : A8
A2-11 : A1
A2-15 (Former standard) : C5

Figure 1 Type designation

3

1.4. Application Purpose of This Product

Body

Wedge plunger

Cover

and special jaw)

Top jaw

T-nut

Grease nipple

Draw Pipe

Draw nut

Jaw mounting bolt

Chuck mounting bolt

Master jaw

Plunger nut

Cylinder thrust

Wedge hook

The power chuck is installed on machine tools such as NC lathes and machining centres to fix a workpiece.
The power chuck is equipped with the jaws to fix the workpiece and they are opened and closed by means of a
rotary cylinder. For any other applications, please contact us.

1.5. Unacceptable Application Example

The power 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 power chuck and rotary hydraulic cylinder are respectively installed on both side of the machine spindle
and connected with the draw pipe.
The hydraulic pressure applied to the cylinder is converted to thrust that pulls the draw pipe and operates the
wedge plunger backward via the draw pipe. Then the master jaw is operated inwardly by the wedge hook and
the force is transferred to the top jaw.

(Not included)

(Including soft jaw, hard jaw,

Jaw operation

Figure 2 Structural drawing

4

1.7. Product Range

No.

Parts name

Quantity

No.

Parts name

Quantity

1

Body 1 9

Coil spring

1

2

Wedge plunger

1

10

Plate wrench for draw nut *2

1

3

Master jaw

3

11

Chuck mounting bolt

3

4

Soft jaw *1

3

12

Jaw mounting bolt *1

6

5

T-nut *1

3

13

Plunger nut mounting bolt

9 / 12

6

Plunger nut

1

14

Cover mounting bolt

3

7

Draw nut

1

15

Steel ball

1

8

Cover

1

16

Grease nipple

3

No.

Parts name

Quantity

No.

Parts name

Quantity

17

Back plate

1

20

O-ring

1

18

Back plate mounting bolt

3 / 6 / 9

21

Tnut-Plus *1

3

19

Cap 1

 This is the chuck instruction manual.

For the cylinder 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 the
warranty.

 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.

*1 : Consumables
*2 : Accessory tool

Table 1 Standard delivery range

Table 2 Optional parts

*1 : Consumables

5

There is also a type to attach the back
plate to the spindle first.

Figure 3 Parts

6

2. Important Safety Precautions

This chapter summarizes precautions that particularly you should know or follow.

Danger

Failure 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 the

workpiece 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 input force must not exceed the limit in operation. (Refer to "3.
Technical Data")

 Excessive rotational speed may cause the workpiece to fly out.
 Excessive input force 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 to
obtain 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 the

workpiece to fly out.

For internal gripping, use the chuck with 1/2 or less of the max. permissible input force for
external gripping.

 Excessive input force may damage the chuck, causing the workpiece to fly out.

When using fixed jaws instead of one or two top jaws, the input force must be 2/3 or less or
1/3 or less of the max. permissible input force.

 Since the input force that is normally applied to three jaws evenly is concentrated in two or 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.

When machining a workpiece with a long protrusion, support it with the steady rest or the
tailstock.

 If not, the workpiece may turn at the end, causing the workpiece to fly out.

Please read them before starting to use the product.

7

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 the

chuck or workpiece to fly out.

If an impact is given to the machine by interference between the chuck/workpiece and the
cutter/turret due to malfunction or program errors, immediately stop rotation. Then
thoroughly check for damage or crack on the parts by disassembling and cleaning them and
perform repair or replacement if necessary. (Refer to page 28.)

 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.

Use the chuck and cylinder that are both manufactured by Kitagawa.
If you must use the chuck together with a cylinder manufactured by another company,
confirm Kitagawa or sales agents that the combination of the chuck and the cylinder is safe.

 Depending on the combination with a particular cylinder, the chuck and the cylinder may be

damaged, causing the workpiece to fly out.

Be sure to tighten the bolts with the specified torque listed in Table 3-1 and Table 3-2.
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 3-1 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 3-2 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 of
damage of the chuck.

 The workpiece slips.
 Machining accuracy has become worse.

 Chattering occurs.
 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 29,
immediately stop using the chuck.

 Continuous use of faulty parts may damage the chuck, causing the workpiece to fly out.

If the cylinder combined is to be changed due to such as model change of a rotary hydraulic
cylinder, change the hydraulic pressure accordingly so as to obtain proper gripping force.

 Use of the chuck under low hydraulic pressure leads to insufficient gripping force, causing the

workpiece to fly out.

 Use of the chuck under high hydraulic pressure leads to damage of the chuck, causing the

workpiece to fly out.

The draw pipe must have sufficient strength with respect to the operating conditions, not
causing run-out and unbalance. The thread accuracy must be 6H / 6g. Tighten the thread
securely with a sufficient penetration length.

 Insufficient strength of the draw pipe, vibration due to unbalance, and looseness of the thread

may damage the draw pipe. If the draw pipe is broken, the gripping force is lost instantaneously,
causing the workpiece to fly out.

Use a lock valve (check valve) built-in type cylinder. (According to JIS B 6150 : 2015, the
cylinder must be provided with equipment such as a check valve so as to maintain the
pressure for a certain period of time when the hydraulic pressure to the cylinder is blocked.)
Design the hydraulic circuit so that the solenoid valve holds the gripping port position when
the current is not applied.

 Sudden drop or interruption of

hydraulic pressure due to power
failure or hydraulic pump failure
will lose the gripping force
instantaneously, causing the
workpiece to fly out.

Use a stroke control sensor built-in type cylinder. (According to JIS B 6150 : 2015, the
cylinder must be provided with equipment such as a stroke control sensor so that the power
chuck or the cylinder ensures effective generation of the gripping force.)

 If the jaw stroke becomes insufficient due to chips accumulating inside the chuck or loosened

draw nut, the chuck may not grip the workpiece, causing the workpiece to fly out.

Figure 4

Cylinder

open

Chuck

close

Solenoid valve

Lock valve

For machine manufacturers

For machine manufacturers

For machine manufacturers

For machine manufacturers

9

Chuck

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 the
allowable range.(Refer to page 26.)

 Additional machining performed out of the allowable range may damage the chuck, causing the

workpiece to fly out.

 Especially, additional machining to the master jaws and T-nut directly causes fly-out of the

workpiece.

Supply grease every day.
When supplying grease, turn OFF the machine main power and be sure to use the specified
grease. (Refer to page 27.)

 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 28.)

 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 the

workpiece to fly out.

When stopping the machine for a long time or when storing the chuck without using it for a
long period, supply grease and rustproof them beforehand.

 Otherwise, rust that will be formed inside the chuck may drop the gripping force, causing the

workpiece to fly out.

Do not wear clothing or accessories such as gloves and necktie which are easy to be caught
in.

 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.

Caution

Failure 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 to
automate the workpiece attaching/detaching operation.)

 Touching workpieces with bare hands may cause a burn because the workpieces may be very

hot.

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 the

cylinder, causing the workpiece to drop.

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.

10

3. Technical Data

Type BR06

BR08

BR10

BR12

Plunger stroke

mm

12

16

19

23

Jaw stroke (in diameter)

mm

5.5

7.4

8.8

10.6

Max. permissible speed

min-1

6000

5000

4500

3500

Through hole diameter

mm

53

66

81

106

External gripping

Max. permissible input force

kN

23

35

49

60

Max. static gripping force

kN

58.5

90

123

156

Max. permissible hydraulic pressure
(operating cylinder) *1

MPa

2.3 (SR1453)

3.2 (SR1566)

3.4 (SR1781)

3.4 (SR2010)

2.1 (SS1453K)

2.5 (SS1666K)

3.1 (SS1881K)

3.0 (SS2110K)

Dynamic gripping force at max. speed

kN

22.5

36

44

53

Gripping range

mm

φ16～170

φ22～210

φ31～254

Φ44～315

Internal gripping

Max. permissible input force

kN

11.5

17.5

24.5

30

Max. static gripping force

kN

29.3

45

61.5

78

Max. permissible hydraulic pressure
(operating cylinder) *1

MPa

1.2 (SR1453)

1.6 (SR1566)

1.7 (SR1781)

1.7 (SR2010)

1.1 (SS1453K)

1.3 (SS1666K)

1.6 (SS1881K)

1.6 (SS2110K)

Mass *2

kg

12.8

22.2

35.8

57.0

Moment of inertia *3

kg・m2

0.052

0.14

0.32

0.80

Standard soft jaw type

SJ06B1

SJ08B1

SJ10B1

SJ12N1

Tnut-Plus type (option)

TN06PLUS

TN08PLUS

TN10PLUS

TN12PLUS

Balance quality of chuck body *4

JIS B 0905 : 1992 G6.3

Storage temperature / operating temperature *5

-20～+50℃ / -10～+40℃

3.1. Specifications

Table 4-1 Specification table

*1 : The max. permissible hydraulic pressure differs depending on the cylinder used.

Set the hydraulic pressure according to the cylinder type.
*2 : The mass is a value when the standard soft jaws and chuck mounting bolts are included.
*3 : 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.

*4 : The balance quality of the chuck body is a value when the soft jaws, T-nut, and jaw mounting bolts are not

included.

*5 : When storing the product, it should be subjected to the antirust treatment and stored in a place free from

wetting, condensation, or freeze.

11

Table 4-2 Specification table (when optional small-diameter gripping soft jaws are used)

Type BR08

Small-diameter gripping soft jaw

SJ08S1

Gripping range in external gripping

mm

φ12～210

𝐻



gripping meter

(Cylinder thrust)

one jaw

Soft jaw circumference end face

Chuck circumference

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

 At the max. permissible input force
 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. Here, the soft jaws are attached to the

position where the soft jaw circumference side end face and the chuck circumference are almost aligned.

 The gripping force is measured by the Kitagawa's gripping meter, and the height of the gripping position is

as shown in Figure 5. (Also refer to Table 5)

 The specified grease is used. (Refer to page 27.)
 A variable capacity type pump having a delivery capacity of 20 L/min or more is used as the hydraulic

pressure source.

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

Pressing force per

max. permissible
input force

Kitagawa's

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

Figure 5 Gripping force measuring method

12