Version 1.11 (2023.02.15)
Original instructions

MA0909PHG

INSTRUCTION MANUALUPR type
Large Thru-Hole Open Center Air ChuckDANGER・ This instruction manual is for production engineers and maintenancepersonnel in charge of operation of this product. When a beginner uses
this product, receive instructions from experienced personnel, thedistributor or our company.
・ Before installing, operating or maintaining this equipment, carefully
read this manual and the safety labels attached to the equipment.
Failure to follow these instructions and safety precautions could result
in serious injury, death, or property damage.
・ Store this manual near equipment for future reference.
・ If any questions related to safety arise about this manual, pleaseconfirm them with the distributor or our company.

Kitagawa Corporation
77-1,Motomachi,Fuchu -shi,Hiroshima,726-8610,Japan
TEL +81-(0)847 -40-0561
FAX +81-(0)847-45-8911

Preface
This manual provides detailed information about how to safely and correctly use the air
chuck (UPR type) for a lathe.
Before starting to use this power chuck, read this manual carefully and always follow the
instructions and warnings in "Important Safety Precautions" and "Precautions for Use"at beginning of the manual. Failure to follow these precautions could result in a serious
accident.

Terms and Symbols Used for Safety Messages
In this manual, precautions for handling that are considered especially important areclassified and displayed as shown below depending on the damage of risk including theseriousness of the harm that could result. Please sufficiently understand the meanings ofthese 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.
Indicates a hazardous situation which, if you not avoided, will
result in death or serious injury.

Indicates a hazardous situation which, if you not avoided,
could result in death or serious injury.
Indicates a hazardous situation which, if you not avoided,
could result in minor or moderate injury.
Indicates instructions which, if not avoided, could result indamage to the equipment or a shortened work life.

1Liability and How to Use this ManualThis product is mounted on the both ends of the lathe spindle and is suitable mainly forgripping long pipes such as oil well pipes. This product is equipped with the jaws to clamp
the workpiece and they operate by means of an air cylinder built in the chuck. For any otherapplications, please contact us.
Our company will not assume responsibility for injury, death, damage, or loss resulting fromnot following the instructions in this manual.
There are countless things that cannot or should not be done, and it is impossible to cover
all of them in this manual.
Therefore, do not perform any actions unless they are specifically allowed in this manual. If
any questions related to safety arise about operation, control, inspection and maintenancewhich 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 consumableparts. We will not assume responsibility for injury, death, damage, or loss caused by usageof parts not manufactured by Kitagawa Corporation. Additionally, if parts other than genuine
parts manufactured by Kitagawa Corporation are used, this guarantee will be completely
invalid.

2

Table of Contents
1. Structural Drawing and Parts List -----------------------------------------------------------------------5
1-1. Type display
1-2. Structural drawing
1-3. Scope of product1-4. Parts list

2.

Important Safety Precautions -----------------------------------------------------------13

3. Specifications ----------------------------------------------------------------------------------------------19
3-1. Specifications
3-2. Relationship between gripping force and rotation speed
3-3. Relationship between gripping part center height, static griping force andpneumatic pressure / Relationship between top jaw mass moment and gripping forceloss
4. Forming Soft Jaw ------------------------------------------------------------------------------------------29
4-1. Attachment of soft jaw
4-2. Forming soft jaw
4-4. Forming method when you use forming jig
5. Usage --------------------------------------------------------------------------------------------------------34
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. Trial Run ----------------------------------------------------------------------------------------------------37
7. Maintenance and Inspection ---------------------------------------------------------------------------38
6-1. Periodic Inspection
6-2. Grease lubrication
6-3. Disassembling3

8. Malfunction and Countermeasures ------------------------------------------------------------------42
8-1. In the case of malfunction
8-2. Where to contact in the case of malfunction

For Machine Tool Manufacturers (Chapter 9)9. Attachment -------------------------------------------------------------------------------------------------44
9-1. Outline drawing of attachment
9-2. Manufacturing and attaching of back plate and support
9-3. Piping
9-4. Precautions related to pneumatic pressure
9-5. Electric circuit diagram for reference
9-6. Jaw stroke detection
9-7. Chuck inner pressure detection
10. Other Information ----------------------------------------------------------------------------------------55
10-1. About standards and orders
10-2. Information about markings of product10-3. About disposal

4

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

Fig.1

5

1-2. Structural drawing

Fig.2

UPR Structural drawing

61-3. Scope of productThis instruction manual is for the chuck part.

Fig.3

・

To prevent the work from flying, safe design, maintenance and erroneous
action prevention of the hydraulic system to maintain the gripping force of thechuck is extremely important. Thoroughly read the “Important Safety
Precautions” on and after page 13 in this manual.

・

For the usage of peripheral equipment, refer to the instruction manuals
respectively.
71-4. Parts list
1. Chuck body

Fig.4
8

Table 1-1
No.
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30

Part name
Lock valve
Body
FlangePistonWedge plunger
Sleeve cover
Master jaw
Soft jaw
T-nut
Air supply ring
Cylinder cover
Diaphragm packing
SpacerCap screw
Seal washer
Seal packing
Pilot spool
Ditectable plate A
Piston A
Cylinder A
Plug
Ditectable plate B
Name plate
Simm
Jaw attaching bolt
Chuck attaching bolt
Cap screw
Cap screw
Cap screw
Cap screwParts list

Q'ty
1
1
1
1
1
1
3
3
6
1
1
1
2
2
2
2
1
1
1
1
1
1
1
2
6
9 or 129 or 129 or 16 or 18
9 or 1212 or 15

9

No.
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60

Part name
Button bolt
X ringX ringX ringO ringO ringO ringO ringO ringO ringO ringO ringO ringO ringHose adaptor
Set screw
Set screw
Grease nipple
Nut
Machine screw
SpringSpringBushing
Steal ballWasherEye bolt
Eye bolt
Pressure gauge
Hex. Key (1 set)Set screw

Q'ty
2
1
1
1
1
1
2
1
1
1
1
1
1
1
2
1
4
6
1
3
1
1
2
1
1
2
1
1
1
4

Table 1-2

Consumption parts

No.
01
12
24
32
33
34
35
36
37
38
39
40
41
42
43
44

Part name
Lock valve
Diaphragm packing
Simm
X ringX ringX ringO ringO ringO ringO ringO ringO ringO ringO ringO ringO ring

UPR45061P401346
61P814423
61P471720
X444
X447
X455
P 10
P 10
P 16
P 18
G 35
S 34
GS 345
GS 315
GS 225
GS 195

UPR60061P401346
61P269500
61P471720
298.2×284.2×7
333.2×319.2×7
X466
P 10
P 11
P 16
P 18
G 35
S34
GS 470
GS 395
GS 320
G 285

No.
01
12
24
32
33
34
35
36
37
38
39
40
41
42
43
44

Part name
Lock valve
Diaphragm packing
Simm
X ringX ringX ringO ringO ringO ringO ringO ringO ringO ringO ringO ringO ring

UPR71061P401346
61P816122
61P473077
61P381520
61P381518
61P381519
P 10
P 11
P 16
P 18
G 35
S 34
580×3.1
525×3.1
GS 430
G 390

UPR91061P401346
61P816052
61P473077
591×578×7
631×618×7
765×752×7
P 10
P 11
P 16
P 18
G 35
S 34
765×3.1
710×3.1
605×3.1
575×3.1

10

UPR65061P401346
61P269635
61P471720
X456
X459
X469
P 10
P 11
P 16
P 18
G 35
S 34
525×3.1
GS 465
GS 380G 340

2. Lock valve
The lock valve is the core part of this chuck. Please handle with care.

・・Take care not to lose the spring when removing the lock valve.
Apply the turbine oil type-1 additive free (ISO VG32) to the O-ring wheninserting the lock valve into the chuck body.

・Take care not to damage the O-ring when removing the lock valve and thenreassembling it.

・Take care not to damage the ball and valve seat in the lock valve. Damaged
parts reduce the gripping force, causing the workpiece to fly out.

・Take care not to attach dust when reassembling the lock valve. Assembling thelock valve with dust attached worsens the jaw operation or reduces the gripping
force, causing the workpiece to fly out.

11Fig.5
Table 2No.

Part name

Part No.

Q’ty

A

Plug

61P401347

1

B

Housing

61P401348

1

C

Ring

61P401349

1

D

Cap

61P401350

1

E

Pilot spool

61P401351

1

F

Spring

61P401352

2

G

Valve seat

61P428716

2

1

Ball

φ16

2

2

O ringS 29

1

3

O ringS 29

1

4

O ringS 30

1

5

O ring

S 31.51

6

O ringG 35

1

7

O ringP 20

1

8

Set screw

M3×3

1

12

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 be caught.

Close door before rotating spindle.
For All Users
・

If the door is not closed, you may touch
the rotating chuck or the work may fly out,
which is very dangerous. (In general, thesafety interlock function which allows
rotation only when the door is the manualmode or the test mode)

Do not internal gripping.
For All Users
・

The chuck is damaged, causing the chuck and workpiece to be damaged or to fly out.

Grip the workpiece within the range of gripping stroke.
For All Users
・Within the jaw stroke range, grip the workpiece within the range of gripping stroke. If theworkpiece is gripped within the range of rapid stroke, the gripping force is lost, causing
the workpiece to fly out.
13

Important Safety Precautions
DANGER

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

The rotation speed of the chuck must not exceed the rotation speed limit
against the pneumatic pressure. (Refer to pages 19-28)
For All Users
・

If the chuck rotation speed exceeds the rotation speed limit, the chuck and workpiece
may fly out.

Measure the maintained chuck internal pressure once a day.
For All Users
・Gripping force lowers due to airleakage, causing the workpiece to fly
out.

・
・

If the air leaks, it must be repaired.
Remove the cap screw from thechuck body and install the pressuregauge attached and set the airpressure to the allowable maximum
pressure, and if the pressure loss per
one hour exceeds 0.05MPa, thechuck must be repaired.
When the protrusion of the work is long, support it with the steady rest or
center.
For All Users

・

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

In the case of processing a significant unbalanced work, lower therotation speed.
For All Users
・

Unbalanced work generates dangerous centrifugal forces and the work could fly out.

14

Important Safety Precautions
DANGER

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

Always tighten the bolts at the specified torque. If the torque isinsufficient or excessive, the bolt will break, which is dangerous as thechuck or work will fly out. Use the bolts attached to the chuck, and do notuse bolts other than these.
For All Users
・

・

・

・

Specified torque forsocket head cap screw

If the torque is insufficient orexcessive, the bolt will break, whichis dangerous as the chuck or work
will fly out.

Bolt size

Fix the lathe spindle or the chuckwhen you tighten bolts. Your hand
could slip and get injury when you
work without fixing the spindle.
You cannot control the torque by ahex key. You must use a torquewrench for torque control.

Tightening torque

M5

7.5

N・m

M6

13

N・m

M8

33

N・m

M10

73

N・m

M12

107

N・m

M14

171

N・m

M16

250

N・m

M20

402

N・m

M22

539

N・m

M24

666

N・m

Tightening torque is moment of force when you tighten a bolt. Tightening torque= F×L.
Determine the gripping force required for processing by the machine tool
manufacturer or user, and check that the required gripping force isprovided before processing. (Refer to pages 19-28)

・For All Users

Adjust the pneumatic pressure to the cylinder to obtain the required gripping force. If thegripping force is insufficient, this is dangerous as the work will fly out.
15

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 27-29). If you must use a jaw taller than astandard soft jaw, use less than the pneumatic pressure
For All Users
specified in the gripping force limit table.
・Do not use a jaw of a height outof the range of the gripping force
limit table or a jaw with mass
moment out of the range of thegripping force limit table. The
chuck will break and the chuck
and work will break and fly out.
The circuit must be designed so that air cannot be supplied during
spindle rotation. It must also be designed so that the spindle cannot be
rotated when back pressure is present.
For Machine Tool Manufactures

・If air is supplied during spindle rotation, the diaphragm packing in the air supply ring will
be damaged and the gripping force will be lost, causing the workpiece to fly out. For
fail-safe operation, the circuit must be designed so that air cannot be supplied during
spindle rotation.

・

If the spindle is rotated when back pressure is present, the diaphragm packing will bedamaged and the gripping force will be lost, causing the workpiece to fly out. The circuit
must be designed so that the spindle cannot be rotated when back pressure is present.
Such circuit must be designed that air is supplied for sufficient time togenerate appropriate gripping force.
For Machine Tool Manufactures

・If switching valve operation is performed, the jaws immediately operate to grip theworkpiece. However, appropriate gripping force is not generated until the chuck internalpressure is stabilized at the setting pressure. Such circuit must be designed that air is
supplied for sufficient time to generate appropriate gripping force. If the chuck internalpressure does not reach the setting pressure, the gripping force is lost, causing theworkpiece to fly out. (Remove the cap screw from the chuck surface and install thepressure gauge attached, and then check the time until the chuck internal pressure
reaches the setting pressure during air supply.)16

Important Safety Precautions
WARNING

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

Maintain proper oil level of the lubricator in the air control unit. Drain
water in the filter periodically.
(For details, refer to the instruction manuals respectively.) For All Users
・

Rust occurs in the cylinder, and the chuck operation fails or gripping force lowers,
causing the workpiece to fly out.

The detection of chuck decompression is possible only when the
supplied air pressure exceeds 0.35MPa (factory default setting). If
machining is performed continuously over one hour, check for reductionin the internal pressure by the detectable plate for chuck
For All Users
decompression every hour. (Refer to pages 50-52)
・

If chuck internal pressure is reduced due to air leakage, gripping force lowers, causing
the workpiece to fly out.

・・

If the air leaks, it must be repaired.
As the detectable plate for chuck decompression functions only when the chuck stops,
the chuck home position stop function is necessary on the machine side.
The workpiece must be re-gripped before machining if the machining is
not performed over one hour after the air was fed.
For All Users

・

If chuck internal pressure is reduced due to air leakage, gripping force lowers, causing
the workpiece to fly out.

Do not attach the chuck vertically.
For All Users
・

The chips and coolant enter the chuck, and the chuck operation fails or gripping force
lowers, causing the workpiece to fly out.

・

If you want to use the chuck vertically, inquire of us.

17

Important Safety Precautions
WARNING

Failure to follow the safety precautions below could result
in serious 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 the chuckdangerous.

・If you attach a locator or jig on the chuck body surface, only process work in an
acceptable range (Refer to page 32).

and the work may fly out, which is

Periodically supply adequate grease (Refer to pages 38-39). Turn off
power before adding grease.
For All Users
・・This is dangerous as the work could fly out from a drop in the gripping force.

Do not operate the machine

Do not operate the machine wearing

after drinking alcohol or taking
medication.
For All Users

gloves, a necktie, and other loose
clothing or
jewelry.

・Dangerous sincethese lead tooperation mistakes
and misjudgment.

For All Users

Dangerous since
it will be caught.

Do not grip a chuck with a chuck.
For All Users
・

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.

18

3. Specifications
3-1. Specifications
Table 3-1

Type
Jaw stroke (in Dia.)
φmm

UPR450

UPR600

UPR650

Rapid

26

33

33

Gripping

14

17

17

Max gripping dia.

φmm

441

590

655

Min gripping dia.

φmm

131

241

239

Max static gripping force

kN

100

120

147

Max permissible speed
Max pneumatic pressure

min-1
MPa

1300

1100

1000

0.6

0.5

0.6

kg

195

365

476

kgm2

5.5

19.7

32.2

Air consumptionNl(at max pneumatic pressure, per stroke)

51

76

95

Plunger stroke

mm

53

53.5

53.5

Cneter hole dia.

φmm

185

275

325

Mass
Moment of inertia

Balance quality(Standard soft jaw not included)

G6.3

Storing templature / Operating templature-20～+50℃ / -10～+40℃

Reference: 1kN = 101.97kgf
1MPa = 10.197kgf/cm 2
When storing this product, the product should be subjected to the antirust treatment andstored in a place free from wetting, condensation, or freeze.

19Table 3-2

Type
Jaw stroke (in Dia.)
φmm

UPR710

UPR910

Rapid

33

33

Gripping

17

17

Max gripping dia.

φmm

715

915

Min gripping dia.

φmm

301

477

Max static gripping force

kN

162

162

min
MPa

900

600

0.6

0.5

kg

532

735

kgm2

43.1

103

Air consumptionNl(at max pneumatic pressure, per stroke)

119

125

Plunger stroke

mm

53.5

53.5

Cneter hole dia.

φmm

375

560

Max permissible speed
Max pneumatic pressure
Mass
Moment of inertia-1Balance quality(Standard soft jaw not included)

G6.3

Storing templature / Operating templature-20～+50℃ / -10～+40℃

Reference: 1kN = 101.97kgf
1MPa = 10.197kgf/cm 2
When storing this product, the product should be subjected to the antirust treatment andstored in a place free from wetting, condensation, or freeze.

20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 air chuck has a mechanism to convert pneumatic pressure to gripping force. Therefore,
the gripping force when the maximum pneumatic pressure becomes the maximum static
gripping force.
However, the gripping force is different depending on the state of grease lubrication, greasein use, height of the jaw, etc. The maximum static gripping force specified in thespecification is the value under the following conditions:・The numerical values are obtained with the Kitagawa gripping force meter . The gripping
position of the gripping force meter is at a position 1/2 of the height of the soft jaw top
surface (height from the chuck surface to the top surface of the jaw).

・The attaching bolts of the soft jaw are tightened at the specified torque. (Refer to page
15)

・
・

CHUCK GREASE PRO is used. (Refer to page 38).
Max pneumatic pressure.

Fig.6

21

2. Allowable maximum rotation speed
In the case of outside diameter gripping, when the chuck is rotated, the gripping force
lowers due to the centrifugal force of the top jaw. Therefore, the rotation speed when the
dynamic gripping force (gripping force during rotation) becomes approximately 1/3 of the
maximum static gripping force is set as the allowable maximum rotation speed. The
centrifugal force is different depending on the mass of the top jaw and the barycentric
position as well as the rotation speed. The allowable maximum rotation speed specified in
the specification is the value under the following conditions:・・

The Kitagawa standard soft jaw is used.
Grip the gripping force meter in the center of the jaw stroke, and at this point, the soft
jaw is attached at the position where the periphery side end of the soft jaw and thechuck periphery are almost lined up.

・The numerical values are obtained by the Kitagawa gripping force meter. The gripping
position of the gripping force meter is at a position 1/2 of the height of the soft jaw top
surface (height from the chuck surface to the top surface of the jaw).

To avoid serious accidents caused by the chuck or work flying out:・

Determine the gripping force required for processing by the machine tool
manufacturer or user, and check that the required gripping force is provided
before processing. The gripping force of the chuck must not exceed the
maximum static gripping force.

・

Determine the rotation speed required for processing by the machine tool
manufacturer or user based on the gripping force required for the processing.
The rotation speed at this point must not exceed the allowable maximum
rotation speed.

・When determining the cutting conditions, refer to pages 22-28.

・

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.

22

3. Relationship between gripping force and rotation speed
As the rotation speed becomes higher, the centrifugal force of the jaw increases and thegripping force lowers. The curves displayed in Fig. 7 shows relationships between therotation speed and the centrifugal force when using the standard soft jaw. The centrifugal
force differs significantly depending on the size and shape of the top jaw and the attachingposition, therefore, when the rotation speed is high, actual measurement using a Kitagawa
gripping force meter is required.

Fig.7

23

・

In the case of processing a considerably unbalanced work, lower the rotation
speed. The work will fly out and this is dangerous.

・Vibration is generated if there is unbalance due to the work and the jig, etc.
Vibration decreases process precision and shortens the working life of thechuck, even possibly breaking it. Correct the unbalance by using a balance
weight, etc., or lower the rotation speed for use.

・In the case of heavy cutting at high rotation speed, vibration is easily
generated in the same manner as the unbalance of the chuck, therefore, set
the cutting conditions appropriate for the dynamic gripping force and machine
rigidity.

24

3-3. Relationship between gripping part center height, static
griping force and pneumatic pressure / Relationship between
top jaw mass moment and gripping force loss
If the gripping part center height of the used top jaw (dimension H in Fig. 8) is higher than
the gripping part center height of the standard soft jaw, a large load is applied to the master
jaw, T nut, jaw attaching bolts, etc. To prevent these parts from being broken, it is necessary
to use the machine by using a lower pneumatic pressure than the allowable maximum
pneumatic pressure.
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 thecentrifugal force and to use the machine at a rotation speed that can withstand the cutting
force.

G: Center of mass of the top jaw
m: Mass of the top jaw
r: Distance from the center of mass of the top jaw to the chuck center
H: Gripping center height

Fig.8

・

Keep the height of the top jaw within the range of the gripping force limit table.
(Refer to Fig.9)

・

If a top jaw is taller than the standard soft jaw, use it at the pneumatic pressure
specified in the gripping force limit table. If it is used without lowering thepressure, the chuck will break and this is dangerous as the chuck and work
will fly out.
25

Fig.9-1

26

Fig.9-2

27

Analysis of the gripping force, pneumatic pressure and rotation speed using Fig. 9 iscarried out as shown below.
・For example, in the case of UPR450 standard soft jaw (mass moment 1891kg・mm),it cannot exceed 1300min-1 (rpm), and the gripping force loss due to the centrifugal
force at this rotation speed is 66.7kN. The required static gripping force for the
dynamic gripping force (gripping force loss by static gripping force - centrifugal force)
to become 1/3 of the static gripping force is 100kN, and the required pneumaticpressure to obtain this gripping force is 0.6MPa. However, it is necessary to use at
the gripping part center height H=35.7 mm or less.

・

If the gripping part center height H is high, it is necessary to lower the static gripping
force.

・・

If the top jaw mass moment is large, the rotation speed needs to be lowered.
If the rotation speed is high, the gripping force loss due to the centrifugal force
becomes large. The centrifugal force is proportional to the square of the rotation
speed.

The required static gripping force and pneumatic pressure required at the rotation speed inuse are predicted from Fig.9, however, it contains a number of hypothetical conditions.
Therefore, it is necessary to only use these as reference, and the processing conditions
must be determined after trial cutting without fail.

・In the case of using only 1 jaw for gripping reduce the input force by 2/3 ormore. 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 chuckwill break, the work will fly out and this is dangerous.

28

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 and the cutting conditions, etc.

・

Use the T nut so that it does not come out from the master jaw. (Refer toFig.10)・

It if the T nut comes out from the master jaw, the master jaw and T nut will
break causing the work to fly out and a possible precision failure.

Fig.10・

Always tighten the bolts at the specified torque. If the torque is insufficient orexcessive, the bolt will break, which is dangerous as the chuck or work will fly
out.
Table 4
Bolt size

Tightening torque

M5

7.5

N・m

M6

13

N・m

M8

33

N・m

M10

73

N・m

M12

107

N・m

M14

171

N・m

M16

250

N・m

M20

402

N・m

M22

539

N・m

M24

666

N・m
29

・

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 toolong and comes out from the bottom of the T nut as well,this is dangerous as the jaw and work will fly out since
the top jaw is not fixed. Therefore, the overall length of
the jaw attaching bolt must be approximately 0 to -1mm
from the bottom of the T nut (Refer to Fig.11).

・

Use the T nut and the attaching bolts attached to thechuck and do not use bolts other than these. If
commercially available bolts are used for an unavoidable
reason, use bolts at the strength classification 12.9
(strength classification 10.9 for M22 or more) or more,
and pay sufficient attention to the length.

・・

Fig.11

Do not rotate the chuck so that the T nut is loosened causing the jaw to fly out.
When gripping the work, use it by keeping the position of the master jaw
within the appropriate stroke range. Gripping in the center of the stroke is themost stable for the mechanism, and the best precision can be obtained.
・

If the workpiece is gripped within the range of rapid feed stroke, thegripping force is lost, causing the workpiece to fly out.

・When gripping near the stroke end, the work may not be grippedsometimes according to the deviation, etc., of the gripping part allowanceof the work, and this is dangerous as the work will fly out.

・When gripping near the stroke end, the chuck may break and the chuck orwork could fly out.

Fig.1230

Table 5
Type

Appropriate stroke range (mm)UPR450

4.0

UPR600

5.0

UPR650

5.0

UPR710

5.0

UPR9105.031

4-2. Forming soft jaw
1. Preparation of the plug for forming
・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・Operate the switch valve and maximize the opening of the jaw.

・Then, process the φD part (part to grip the plug for forming). Set
the dimension φD so that gripping near the center of the jaw
maximum stroke (diameter) is possible.

・

φD = φd + (jaw maximum stroke/2)

3. Gripping of the plug for forming・

By operating the switch valve, grip the plug for forming in the φD part. At this time, grip by pressing the plug on the chuck front
surface in order for the plug not to be tilted. Repeat chucking
several times to stabilize the plug.

4. Forming・Process the gripping part (dimension φD’) of the work in thestate that the plug 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.

・

Set the hydraulic pressure during forming the same as during
processing of the work, or slightly higher.

・When the plug distorts, lower the hydraulic pressure or change
the plug into a shape which does not easily distort.

5. Trial cutting・

Remove the plug for forming and grip the work to check the jaw
stroke.

・

Implement trial cutting to check the process precision and that
there is no slip, etc.

・Contacting on the gripping surface is to be 2 points contact of
the side A and the side B when gripping.

32

4-3. Forming method when you use forming jig
1. Preparation of the jig for forming
・Prepare the jig for forming. (There is a commerciallyavailable product.)・

Attach the pin (Example 1) or the bolt and nut (Example 2)
by dividing equally into 3 portions onto the ring shapeplate. Make the ring into a shape with sufficient thickness
which does not distort.

2. Gripping of the jig for forming・Operate the switch valve and maximize the opening of thejaw. Then, operate the switch valve to insert the jig forforming into the bolt hole of the soft jaw to grip. At thistime, grip by pressing the ring end surface of the jig forforming onto the jaw so as not to generate run-out.

・

Check that it is gripping almost in the center of theappropriate stroke.

・

Set the hydraulic pressure when forming slightly higher
than when processing the work.

3. Forming・Process the gripping part (dimension φD’) of the work inthe state that the jig for forming is kept gripped. The φD’part is to be approximately the same diameter (H7) as thediameter of the gripping part of the work, and process tobe surface roughness at 6s or less.

4. Trial cutting・

Remove the jig for forming and grip the work to check thejaw stroke.

・

Implement trial cutting to check the process precision andthat there is no slip, etc.

・Contacting on the gripping surface is to be 2 points contactof the side A and the side B when gripping.

33

5. Usage
This product is used to clamp a workpiece when machining it on a lathe.
The built-in air cylinder moves the jaws toward the closing side to grip the workpiece, sothat the workpiece is clamped during the machining. After the machining, the jaws movetoward the open side to allow the workpiece to be removed.

・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 highgripping force.

5-1. Precautions during gripping work with chuck・

When gripping a work with the chuck, do not get fingers or hands becomecaught. This could cause crushed or cut fingers and hands.

5-2. Precautions during gripping work in irregular shape・

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 thework will fly out.

34

5-3. Precautions related to usage of jaw

・If a soft jaw other than one made by Kitagawa Corporation is used, theengagement will be inferior, and the master jaw will be deformed, the gripping
precision will worsen, and the work will fly out due to gripping failure, which isdangerous.

・Do not use a top jaw with a different serration pitch from the master jaw. The
engagement of the crests of the serration will become insufficient, therefore,
the serration crests will break when gripping the work, and this is dangerous
as the jaw and work will fly out.

・Do not use the soft jaw by welding to join for extension. The jaw will break due
to insufficient strength and the serration part will become distorted due towelding. As a result, the engagement will worsen, the serration crests will
break, and this is dangerous as the work will fly out.

5-4. Precautions related to processing<1> Unbalance・In the case of processing largely unbalanced work, lower the rotation speed.
The work will fly out and this is dangerous.

・Vibrations are generated if there is unbalance owing to the work or the jig, etc.
Vibration not only will impart a negative influence on the process precision
but also the endurance of the chuck being remarkably shortened, and thechuck 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 samemanner as chuck unbalance, therefore, set cutting conditions appropriate forthe dynamic gripping force and machine rigidity.

<2> Interference, contact, impact
・Before starting work, check that the top jaw, locator, work, etc., and the tooland the tool post, etc., do not interfere at low rotation and then start
processing.

・

Do not allow anything to impact the chuck, jaw, and the work. The chuck will
break and this is dangerous as the chuck and work will fly out.

・

If the tool and the tool post contact the chuck or the work due to malfunction
35

or tape mistake, etc., and impact is given, immediately stop the rotation, andcheck that there are no abnormalities in the top jaw, master jaw, T nut andbolts of each part, etc.
<3> Coolant
・Unless coolant with a rust preventive effect is used, rust will occur inside thechuck and gripping force drop may result. The work will fly out due to thegripping 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 ahole in the additional process range specified in Fig. 13.

Fig.13
Table 6

A
φB
φC
D
E
φF
G
H
J

UPR450 UPR600 UPR650 UPR710 UPR910
100
100
120
120
120
262
364
419
469
657
299
405
475
535
723
26
18
18
23
23
54
40
45
45
42
305
438
487
546
745
70
49
50
35
56
92
69
69
51
64
21
26
32
32
31
(mm)
36

・

The chuck can be modified only in the manufacturer permissible range. This
will not only break the chuck but the chuck and work may fly out, which isdangerous.

・Provide a countermeasure against flying out (dwell pin, etc.) due to centrifugal
force to the locator or the jig, and attach with bolts which have sufficientstrength. The locator or the jig may fly out, and this is dangerous.

6. Trial Run
Thoroughly read the “Important Safety Precautions” on and after page 13 in this manual
before trial run.
1. Supply the specified grease to the grease nipples on the master jaws and body
circumference. (Refer to page 38)
2. Fill the lubricator with the turbine oil class-1 additive-free (ISO VG32) to the upper limit.
At this time, do not allow the dust to enter.
3. Set the pneumatic pressure to 0.2MPa and operate the switching valve to check that thejaws move over full stroke completely.
4. Adjust drips in the lubricator. The amount of lubricant drops shown in Table7 isappropriate.
5. Set the pneumatic pressure to 0.5MPa and operate the switching valve to check
respective parts for air leakage and abnormality.
6. After clamping the workpiece, allow a few seconds of dwell time after the back pressure
drops below 0.01 MPa before starting rotation. The recommended dwell time is 5
seconds.
7. Rotate the spindle at a speed of 100 - 200min-1. When vibration or noise is generated,check the back plate and the chuck body for significant runout, or check that the air
supply ring does not come into contact with the chuck body.
Table 7Type
UPR4502 drips per one chucking

UPR6003 drips per one chucking

UPR6504 drips per one chucking

UPR7105 drips per one chucking

UPR9105 drips per one chucking
37

7. Maintenance and Inspection
7-1. Periodic Inspection
・Supply oil to the master jaws at least once a day, and to the body circumference at least
once a week.

・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 20,000 strokes (onceevery 2 months or more for cutting cast metal, brass, etc.).

・

If the chuck has not been used for more than one week, operate the chuck with no load
at least 10 times and check drips of lubricator before starting the machining.

・・

Check for water in the air filter and drain it periodically, which otherwise causes rust.
Supply oil to the lubricator so as to maintain proper oil level range. Use the turbine oil
type-1 additive free (ISO VG32).

・

Measure the maintained air pressure once a day. Remove the cap screw from the chuck
body and install the pressure gauge attached and set the air pressure to the allowablemaximum pressure, and if the pressure loss per one hour exceeds 0.05MPa, the chuckmust be repaired.

・

If air leaks from the air supply ring when supplying air to the chuck during use of thechuck or during daily pressure measurement at the air pressure holding state, thediaphragm packing may be worn out and should be replaced.

・

After the pressure measurement, apply the turbine oil class-1 additive-free (ISO VG32)
to the pressure gauge mounting hole and retighten the cap screw.

・When installing the pressure gauge, operate the chuck so that the master jaws
are closed, and loosen slowly the cap screw at the front of chuck body todischarge the air completely from the cylinder. Loosening the cap screw withinternal pressure remained causes the cap screw to fly out due to the internalpressure.

38

7-2. Grease lubrication
1. Position to lubricate
・A total of six grease nipples are provided on each master jaw and the body
circumference (at three points). Supply oil to the master jaws with the jaws closed.
Supply oil to the body with the jaws open.

・Be sure to supply oil to all of the six grease nipples.

2. Grease to use
・Use the designated grease specified in Table 8. If grease other than the designatedgrease is used, sufficient effect may not be obtained.
Table 8Genuineproduct

Conventional
product

CHUCK GREASE PRO

Kitagawa genuine product(Kitagawa distributor of each country)

Kitagawa chuck grease

Conventional product

Molykote EP Grease

TORAY Dow Corning (only inside Japan)

Chuck EEZ grease

Kitagawa-Northtech Inc. (North American region)

MOLYKOTE TP-42

Dow Corning (Europe, Asian region)

Kluberpaste ME31-52

Kluber lubrication (worldwide)

3. Frequency of lubrication
・・Supply oil to the master jaws at least once a day, and to the body at least once a week.
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.

・To keep the chuck running in the best condition for a long time, adequate greaselubrication is necessary. Insufficient grease lubrication causes a drop in thegripping 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.

39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
After inhalation: 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.
After ingestion: 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.

7-3. Disassembling
Disassembling procedures
Read the following disassembling procedures with reference to pages 8-10.
1. Turn off the main power of the machine before starting work.
2. Loosen the jaw attaching bolt [25] and remove the soft jaw [08] and T-nut [09].
3. Loosen the chuck attaching bolt [26] and remove the chuck from the spindle.
4. Loosen the cap screw [29] and remove the sleeve cover [06].
5. Loosen the cap screw [27] and remove the flange [03].
6. Loosen the cap screw [28] and remove the piston [04].
7. Loosen the cap screw [30] and remove the cylinder cover [11].
8. Remove the wedge plunger [05] to the chuck rear side.
9. Remove the master jaw [07] to the inner periphery side of the chuck. At this time, only
for No.1 jaw, remove the master jaw while pulling the pilot spool [17] toward the rear of
the chuck.
10. 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 [02], master jaw [07], and the wedge plunger [05].
11. Refer to page 43 about the installation procedure. (9. Attachment).

40

・

Use an eyebolt or a hanging belt when attaching and detaching the chuck toand from the machine, as there is a danger of injury or damage if the chuckdrops.
Type

Eye bolt

UPR450M12PR600、UPR650

M20

UPR710

M24

UPR910

M30

・

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

・

Only experienced and trained personnel should do disassembling or
assembling. Disassembling / assembling by a person who has never received
instruction from an experienced person, the distributor or our company may
cause a serious accident.

・Disassemble and clean the chuck at least once every 6 months or every 20,000
strokes (once every 2 months or more for cutting cast metal, brass, etc.). 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 isworn or cracked.

・

If the workpiece slips during machining, the cause must be found out by
disassembling and cleaning the chuck. Particularly, if dust enters the lockvalve, the gripping force is reduced, causing the workpiece to fly out.

・When disassembling the chuck, operate the chuck so that the master jaws areclosed, and loosen slowly the cap screw at the front of chuck body todischarge the air completely from the cylinder. Removing the plugs withinternal pressure remained causes the chuck parts to fly out.

・After inspection, apply sufficient grease in the designated areas andreassemble.

・After assembling, measure the gripping force according to the method on
page 21, and check that the specified gripping force is obtained.

・

If you stop the machine for a long period of time, remove the work from themachine. If you don't, the work can drop due to a drop in the pneumaticpressure or malfunction.

・If you stop the machine or store the chuck for a long period of time, add
grease to prevent rust.
41

8. Malfunction and Countermeasures
8-1. In the case of malfunction
Check the points specified in the table below and take the appropriate countermeasure.

Table 9Problem

Cause

Countermeasure

Chuck internal part is broken.

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

Slideways get seized
replace the part.
Orientation must be performed so that the phases of the rotation
Chuck

does

not

part and the fixed part of the chuck are aligned to those specified
Compressed air is not supplied normally.

operate.

when air is supplied to the chuck. Check that the phases arecorrect. (Refer to page 47)
Wear or damage of the air supply ring,
Disassemble, and replace the part.
diaphragm packing, and cylinder O-ring
Faulty lock valve

Disassemble and clean it, or replace the part.

If the phases of the rotation part and theAbnormalnoiseoccurs.

fixed part of the chuck are not aligned

Check that the phases of the rotation part and the fixed part of thecorrectly, air cannot be supplied correctly,

chuck are correctly aligned. (Refer to page 47)

causing abnormal noise.
Lack of jaw stroke

Many chips exist in jaws.

Disassemble and clean the jaws.
Adjust the top jaw position so that it is around the center of stroke

Lack of jaw strokewhen gripping the workpiece.
Lack of gripping force

Check that the setting air pressure is correct.

The formed diameter of the top jaw does
Reform the jaw according to the correct forming method.
not match the workpiece diameter.
Calculate cutting force and check that it is appropriate for the chuck
Excessive cutting force
specification.
The

work-piece
Supply grease from grease nipple, and open and close the jaws

slips.

Lack of grease
several times without gripping the workpiece.
Excessive

top

jaw

weightcausesRemove unnecessary part of the top jaw to reduce the weight. (Pay

excessive loss of gripping force during
attention to the strength of the top jaw.)
high-speed rotation.
Excessive rotation speed. Runout due to

Slow down the rotation speed to obtain required gripping force.

misalignment of the work feeder, steadyrest, tailstock, etc.

Thoroughly conduct alignment to eliminate runout.

42

Remove the cap screw on the chuck body and measure air
Air leaks from the lock valve.

pressure. Replace the O-ring on the lock valve or the whole lockvalve.

Wear of cylinder O-ringDisassemble, and replace the O-ring.
Check the circumference and end face for runout and retighten the

Chuck circumference runs out.
chuck mounting bolts.
Dust accumulates in serration parts ofRemove the top jaw and thoroughly clean the serration part.
master jaw and top jaw.
Top jaw mounting bolts are not sufficiently

Tighten the top jaw mounting bolts with the specified torque.

tightened.

(Refer to page 15)
Check that the forming plug is parallel to the chuck end face andAccuracy failure

check the plug for deformation due to gripping force. Also, check
Soft jaws are formed inadequately.
the air pressure during formation and surface roughness of theforming part.
Due to excessive top jaw height, the top
Lower the top jaw height. (Replace with standard size.) Check thejaw is deformed and the top jaw mounting
gripping contact surface and make it even.
bolts are extended.
Excessive gripping force deforms

Reduce the gripping force to the extent that machining can beworkpiece.

executed to prevent deformation.

・

In case that the chuck failed to operate due to a seizure or breakage, remove
the chuck from the machine following the reverse procedures of “9.
Attachment” on page 40. When the jaws and covers cannot be removed due toa blockage of workpiece, do not disassemble forcibly but please contact 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 adefective 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.

8-2. Where to contact in the case of malfunction
In the case of malfunction, contact the distributor where you purchased the product or ourbranch office listed on the back cover.
43

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

9. Attachment
9-1. Outline drawing of attachment

Fig.1444

9-2. Manufacturing and attaching of back plate and support

・Run-out of the back plate directly affects the process precision. The end surface
run-out of the back plate, spigot joint diameter run-out must be 0.02 mm or less.
(Refer to Fig.15)

・Provide a support to secure the air supply ring to the lathe body. Refer to the
Delivery Specification for the dimensions. The end surface run-out of the support
must be 0.1mm or less. For dimension A in Fig.15, consideration must be given sothat the tolerance can be adjusted to within ± 0.1.

・

Provide an air escape hole (over φ40) underneath the support as shown in Fig.15.
This hole escapes the air coming out of a gap between supply ring and chuck. The
jaw operating speed slows unless the hole is provided.

・

Establish a hole for the detectable plates in the support side because you can attachor remove the chuck while fixing the air supply ring on the support like fig.15. All
except for the chuck attachment and removal time block the hole up by a lid so that
coolant and chips doesn't enter in the support.

・Make the phase of the chuck installation tapped hole of the front side of a spindle
and a back side even. When there is a difference in the phase, air is not supplied.

・

Adjust the runout occurring when the support and the air supply ring aremounted to be less than the value shown in Fig.15. Check that the clearance
between the air supply ring and the body is 0.5±0.2 mm. If the air supply ringcomes into contact with the body, seizure may occur during chuck rotation.

・Always tighten the bolts at the specified torque. If the torque is insufficient orexcessive, the bolt will break, which is dangerous as the chuck or work will fly
out.
Table 10
Bolt size

Tightening
torqueBolt size

Tightening
torque

M5

7.5

N・m

M14

171

N・m

M6

13

N・m

M16

250

N・m

M8

33

N・m

M20

402

N・m

M10

73

N・m

M22

539

N・m

M12

107

N・m

M24

666

N・m

45

Fig.15

・

Use an eyebolt or a hanging belt when attaching and detaching the chuck toand from the machine, as there is a danger of injury or damage if the chuckdrops.

・

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

46

Attaching procedures of detectable plate
The detectable plates for jaw stroke detection and chuck inner pressure detection are
belong parts.
Read the following attaching procedures with reference to pages 8-9.
① Attach the detectable plate A [18] to the pilot spool [17] which is behind No.3 jaw. Thentighten the set screw [47] and [60].
② Attach the detectable plate B [22] to the piston A [19]. Then tighten the set screw [47]and [60].

Fig. 1647

9-3. Piping
For the air circuit diagram, refer to Fig.17.
・・

Be sure to use exhaust center type solenoid valve of 3-position and 4-direction.
The piping connection bore is according to sizes as shown in table 11. Route the air
hose of size shown in table 11. Also, route the pipe of the short piping length asmuch as possible and don’t use the piping having many elbows. Use the air hosewith blade between chuck and solenoid valve.

・・

Remove foreign mater and dust inside of piping before routing.
Attach the pressure gauge at the place for operator to be easily watched andadjusted.

Fig.17
Table 11Type
Item
Pipe diameter (mm)Connection diameter

UPR450 - UPR600

UPR650 - UPR910

φ9.5 or more
Rc 3/8

φ13 or more
Rc 1/248

9-4. Precautions related to pneumatic pressure・Do not supply air during spindle rotation. If air is supplied during spindle
rotation, the diaphragm packing in the air supply ring will be damaged and thegripping force will be lost, causing the workpiece to fly out. For fail-safe
operation, such circuit must be designed that air cannot be supplied during
spindle rotation.

・

If the spindle is rotated when back pressure is present, the diaphragm packing
will be damaged and the gripping force will be lost, causing the workpiece to
fly out. Exhaust detection must be performed as shown in Fiｇ.16 and thecircuit must be designed so that the spindle cannot be rotated when backpressure is present.

・

If switching valve gripping operation is performed, the jaws immediately
operate to grip the workpiece. However, appropriate gripping force is not
generated until the chuck internal pressure is stabilized at the settingpressure. Such circuit must be designed that air is supplied for sufficient timeto generate appropriate gripping force. If the chuck internal pressure does notreach the setting pressure, the gripping force is lost, causing the workpiece to
fly out. (Remove the cap screw from the chuck surface and install the pressuregauge attached, and then check the time until the chuck internal pressure
reaches the setting pressure during air supply.)・

Design the chuck which performs orientation so that the phases of the rotation partand the fixed part of the chuck are aligned to those specified when air is supplied tothe chuck. At other phases, air is not supplied and the chuck cannot operate. The
phases differ depending on the chuck size and specification, so refer to the Delivery
Specification. The following alignment mark is provided on the air supply ring so thatphase alignment can be checked.

499-5. Electric circuit diagram for reference
The sequence circuit using the pressure switch of push button is shown in Fig.18.

Fig.18・・・

Prepare the diagram so that the chuck dose not operate during spindle rotation.
Since the spindle, chuck, work, etc., are immediately stopped by inertia.
The above PS2 is for lowest pressure detection and CR4 mode allows the spindle not tostart if exhaust pressure remains in to the air supply hose for the chuck. PS1 is for
optimum pressure detection and the optimum pressure is required to set in accordancewith the work. When the pressure reaches the optimum pressure, CR3 actuates to open
the SOL circuit.
50

9-6. Jaw stroke detection
The detectable plate for jaw stroke detection is built in the UPR air chuck and operates insynchronization with the jaw stroke. It prevents gripping failure by detecting the motion withthe proximity switch.
As shown in Fig.19-(1), when the jaws are opened, the detectable plate moves toward therear of the chuck. Also, as shown in Fig.19-(2), when the jaws are closed, the detectable
plate moves toward the front of the chuck.

Detectable plate for jaw
stroke detection

(1)
When

the

jaws

are

opened, the detectable

Open

plate moves toward therear of the chuck.
Close
(2)
When

the

jaws

are

closed,thedetectable

plate moves toward thefront of the chuck.

Fig.19Proximity Switch
The chuck must stop at the home position to detect the jaw stroke.
Install the proximity switch in the position where it can detect the dog from thecircumference of support. In such a case, cover the switch to protect it from the chips andcoolant.

51

9-7. Chuck inner pressure detection
The detectable plate for chuck decompression is built in the UPR air chuck and operates
when the chuck internal pressure of the jaw close side is reduced. By detecting the motion
with the proximity switch, it prevents the workpiece from flying out due to reduced gripping
force.
As shown in Fig.20-(1), when air is supplied to the jaw close side, the internal pressure
surpasses the spring and the detectable plate moves toward the front of the chuck. Also, asshown in Fig.20-(2), when the internal pressure of the jaw close side is reduced to a given
value, the detectable plate is moved toward the rear of the chuck by the spring.

(1)
Open

When air is supplied to thejaw close side, the internalpressure

surpasses

thespring and the detectable

Close

plate moves toward the frontof the chuck.
(2)
When the internal pressure
is reduced to a given value,
theinternalpressureisdefeated by the spring andthe detectable plate moves
toward the rear of the chuck.

Detectable plate for
inner pressure detection

Fig.20The detection of chuck decompression is possible only when the supplied air pressure
exceeds 0.35MPa (factory default setting).
When the air is supplied to the chuck, the dog moves 4mm till the chuck forward strokeend before the supplied air pressure reaches 0.35MPa. When the air pressure in thechuck is reduced, the dog moves 4mm till the chuck rear (spindle side) stroke end
before the internal air pressure reaches 0.175 – 0.225MPa.

52

● The spring determines the working pressure of the detectable plate. Therefore,
particularly if air is supplied at high pressure, the detectable plate may performmomentary reciprocating motion at the moment when air is supplied as shown in
Fig.21. To prevent the proximity switch from detecting the momentary reciprocating
motion of the detectable plate shown in Fig.21, please give consideration to keep theproximity switch from detecting for a few seconds just after air is supplied by using atimer, etc.
(1)

① At the moment when air is
supplied, the detectable plate
momentarily moves toward the(2)front of the chuck.
② Immediately it goes back to theinitial rear position.

Detectable plate for
inner pressure detection(3)③ Then,thedetectableplatemoves slowly toward the front of
the chuck and stops. (Internalpressure is maintained.)

Fig.21

Proximity Switch
The chuck must stop at the home position to detect the chuck decompression.
Install the proximity switch in the position where it can detect the dog from thecircumference of support. In such a case, cover the switch to protect it from the chips
and coolant.

53

Adjusting chuck decompression detection start pressure
As shown in Fig.22, the spring force of the internal pressure detection unit can be changedby tightening the lock screw, and the chuck decompression detection start pressure can be
adjusted. The detection start pressure increases as the lock screw is tightened. The
pressure decreases as the screw is loosened.
When the adjustment is completed, lock the lock screw with the nut.

Fig.22
Table 12

Set screw
Height (mm)Avarable pressure (MPa)
Detection start pressure (MPa)

M12×30

M12×30

M12×35

13

10

12

0.35
0.20

0.40
0.25

0.45
0.30

54

10. Other information
10-1. 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

10-2. Information about markings of productFig.2355

10-3.About disposal
Ultimate disposal of this product should be handled according to all national laws andregulations.

56

YY3037PKY2DECLARATION OF INCORPORATION
of partly completed machinery
Copy of original
We hereby declare that the following our product conform with the essential health andsafety requirements of the EC Machinery Directive so that the product is to beincorporated into end-machinery. The product must not be put into service until endmachinery has been declared in conformity with the provisions of the EC Machinery
Directive 2006/42/EC Annex II part 1.A.
We also declare that the specific technical documentation for this partly completed
machinery was drawn up according to the EC Machinery Directive 2006/42/EC Annex
VII part B.
Product: Standard chuck

Model: UPR series(Models UPR440, UPR450, UPR460, UPR550, UPR570
UPR600, UPR650, UPR710, UPR910)

Serial number: See original declaration

Manufacturer: Kitagawa Corporation
77-1, Motomachi, Fuchu-shi,
Hiroshima 726-8610, Japan

Authorized compiler
in the community: Peter Soetebier / Prokurist
Kitagawa Europe GmbH
Borsigstr.3 D-40880 Ratingen, GERMANY

The essential health and safety requirements in accordance with the EC
Machinery Directive 2006/42/EC Annex I were applied and fulfilled:
1.1.2, 1.1.3, 1.1.5, 1.1.6, 1.3.1, 1.3.2, 1.3.4, 1.5.4, 1.5.8, 1.5.9, 1.5.13, 1.6.1, 1.7.1,
1.7.2, 1.7.3, 1.7.4, 1.7.4.1, 1.7.4.2
The following harmonized standards were applied:
EN ISO 12100:2010, EN 1550:1997+A1: 2008
Signature: See original declaration

Place / Date : See original declaration
Name / Title : Tomonari Hiromoto / Manager, Technical section 1
Technical department
Kitagawa Global hand Company
Being the responsible person appointed and employed the manufacturer.

YY3815PKY

UK DECLARATION OF INCORPORATION
of partly completed machinery
Copy of original
We hereby declare that the following our product conform with the essential health andsafety requirements of the Supply of Machinery (Safety) Regulations 2008 so that the
product is to be incorporated into end-machinery. The product must not be put into
service until end-machinery has been declared in conformity with the provisions of the
Supply of Machinery (Safety) Regulations 2008 Annex II part 1.A.
We also declare that the specific technical documentation for this partly completed
machinery was drawn up according to the Supply of Machinery (Safety) Regulations
2008 Annex VII part B.
Product: Standard chuck

Model: UPR series(Models UPR440, UPR450, UPR460, UPR550, UPR570
UPR600, UPR650, UPR710, UPR910)

Serial number: See original declaration

Manufacturer: Kitagawa Corporation
77-1, Motomachi, Fuchu-shi,
Hiroshima 726-8610, Japan

Authorized complierin the community: Mark Jones / Financial Director
UNIT 1 THE HEADLANS, DOWNTON,SALISBURY, WILTSHIRE, SP5 3JJ, UNITED
KINGDOM

The essential health and safety requirements in accordance with the Supply of
Machinery (Safety) Regulations 2008 Annex I were applied and fulfilled:
1.1.2, 1.1.3, 1.1.5, 1.1.6, 1.3.1, 1.3.2, 1.3.4, 1.5.4, 1.5.8, 1.5.9, 1.5.13, 1.6.1, 1.7.1,
1.7.2, 1.7.3, 1.7.4, 1.7.4.1, 1.7.4.2
The following harmonized standards were applied:
EN ISO 12100:2010, EN 1550:1997+A1: 2008
Signature: See original declaration

Place / Date : See original declaration
Name / Title : Tomonari Hiromoto / Manager, Technical section 1
Technical department
Kitagawa Global hand Company
Being the responsible person appointed and employed the manufacturer.

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

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

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Tel. +81-22-232-6732
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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
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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.
America Contact

https://www.kitagawa-usa.com

301 E. Commerce Dr,Schaumburg,IL. 60173 USA
Tel. +1 847-310-8787
Fax. +1 847-310-9484

KITAGAWA MEXICO S.A. DE C.V
Circuito Progreso No. 102, Parque Industrial Logistica Automotriz, Aguascalientes, Ags., C.P.20340
Tel. +52 49-917-8825

Fax. +52 449-971-1966

KITAGAWA EUROPE LTD.

https://www.kitagawa.global/en
Unit 1 The Headlands,Downton,Salisbury,Wiltshire SP5 3JJ,United Kingdom
Tel. +44 1725-514000
Fax. +44 1725-514001

KITAGAWA EUROPE GmbHhttps://www.kitagawa.global/deBorsigstrasse 3,40880,Ratingen Germany
Tel. +49 2102-123-78-00
Fax. +49 2102-123-78-69

KITAGAWA EUROPE GmbH Poland Office
Europe Contact

https://www.kitagawa.global/pl44-240 Zory,ul. Niepodleglosci 3 Poland
Tel. +48 607-39-8855

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

Purkynova 125,612 00 Brno,Czech RepublicTel. +420 603-856-122
Fax. +420 549-273-246

KITAGAWA EUROPE GmbH Romania Officehttps://www.kitagawa.global/roStrada Heliului 15,Bucharest 1,013991,Romania
Tel. +40 727-770-329

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

Dery T.u.5,H-9024 Gyor,Hungary
Tel. +36 30-510-3550

KITAGAWA INDIA PVT LTD.

https://www.kitagawa.global/in
Plot No 42, 2nd Phase Jigani Industrial Area, Jigani, Bangalore – 560105, Karnataka, India
Tel. +91-80-2976-5200
Fax. +91-80-2976-5205

KITAGAWA TRADING (THAILAND) CO., LTD.

https://www.smri.asia/jp/kitagawa/9th FL,Home Place Office Building,283/43 Sukhumvit 55Rd. (Thonglor 13),Klongton-Nua,Wattana,Bangkok 10110,Thailand
Tel. +66 2-712-7479
Fax. +66 2-712-7481

Kitagawa Corporation(Shanghai)
Asia Contact

https://www.kitagawa.com.cn

Room308 3F Building B. Far East International Plaza,No.317 Xian Xia Road,Chang Ning,Shanghai,200051,China
Tel. +86 21-6295-5772
Fax. +86 21-6295-5792

Kitagawa Corporation(Shanghai) Guangzhou OfficeB07,25/F,West Tower,Yangcheng International Trading Centre,No.122 East Tiyu Road,Tianhe District,Guangzhou,China
Tel.+86 20-2885-5276

DEAMARK LIMITED

https://www.deamark.com.tw

No. 6,Lane 5,Lin Sen North Road,Taipei,Taiwan
Tel. +886 2-2393-1221
Fax. +886 2-2395-1231

KITAGAWA KOREA AGENT CO., LTD.

http://www.kitagawa.co.kr
803 Ho,B-Dong,Woolim Lion's Valley,371-28 Gasan-Dong,Gumcheon-Gu,Seoul,Korea
Tel. +82 2-2026-2222
Fax. +82 2-2026-2113

DIMAC TOOLING PTY. LTD.
Oceania Contact

https://www.dimac.com.au

69-71 Williams Rd,Dandenong South,Victoria,3175 Australia
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 t he related regulation prior to any transaction.