Version 1.12 (2021.08.03)
Original instructions

INSTRUCTION MANUAL

NV type
Closed Center Power Chuck
for Vertical lathe

DANGER・ 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,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 powerchuck (NV 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 suitable for gripping a workpiece on the lathes or rotary tables. This productis equipped with the jaws to clamp the workpiece and they operate by means of a rotary
cylinder. For any other applications, please contact us.
Our company will not assume responsibility for injury, death, damage, or loss resulting 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.
The chuck and cylinder from Kitagawa Corporation should be used together. If you mustuse a part not made by Kitagawa, check with us or our distributor to be sure it is safe to doso. We will not be responsible for injury, death, damage or loss caused by use of a chuckor cylinder made by another company unless this use has been approved by Kitagawa or
its distributor.

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 ------------------------------------------------------------9

3. Specifications ----------------------------------------------------------------------------------------------16
3-1. Specifications
3-2. Relationship between gripping force and rotation speed
3-3. Relationship between gripping part center height, static griping force and input
force / Relationship between top jaw mass moment and gripping force loss
4. Forming Soft Jaw ------------------------------------------------------------------------------------------27
4-1. Attachment of soft jaw
4-2. Forming soft jaw with outside diameter gripping
4-3. Forming soft jaw with inside diameter gripping
4-4. Forming method when you use forming jig
5. Usage --------------------------------------------------------------------------------------------------------33
5-1. Precautions during gripping work with chuck
5-2. Precautions during gripping work in irregular shape
5-3. Precautions related to usage of jaw
5-4. Precautions related to processing
5-5. Attachment of locator and jig
6. Maintenance and Inspection ---------------------------------------------------------------------------37
6-1. Periodic Inspection
6-2. Grease lubrication
6-3. Disassembling
7. Malfunction and Countermeasures -------------------------------------------------------------------42
7-1. In the case of malfunction
7-2. Where to contact in the case of malfunction3For Machine Tool Manufacturers (Chapter 8)
8. Attachment --------------------------------------------------------------------------------------------------44
8-1. Outline drawing of attachment
8-2. Production of draw pipe
8-3. Attachment of chuck
9. Other Information -----------------------------------------------------------------------------------------55
9-1. About standards and orders
9-2. Information about markings of product9-3. About disposal

4

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

Fig.1

1-2. Structural drawing

Fig.2

5

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 9 in this manual.

・

As for the cylinder, follow the instruction manual for the cylinder.
6

1-4. Parts list

Fig.4

7

Table 1
Part name

No.

Q’ty

Part name

No.

Q’ty

1

Body

1

24 Hexagon socket head cap screw★4

2

Wedge plunger

1

25 Set screw

1

3

Master jaw

3

26 Set screw

1
★5

6★5

4

Soft jaw

3

27 Set screw

5

T nut

6★1

28 Steal ball

1

6

Cover

1

29 Lead ball

1

7

Draw screw

1

30 Hex key

1

8

Draw tube

1

31 Hex key

1

9

Draw nut

1

32 Hex key

1

10 Spring1

33 Hex key

1

11 Handle

1

34 Hex key

1

Scraper Ｌ

3

35 Hex key

1

Scraper Ｒ

3

36 Socket head cap screw

3★6

13 Spacer

3

37 Hexagon socket head cap screw

6

14 Protector

338 Grease nipple

3

15 Cover cap

1

39 Orifice plug

3★7

16 Back plate1

40 Hexagon socket head screw plug

1★8

17 Name plate

1★2

41 O ring1

18 Hexagon socket head cap screw

6★3

42 O ring

1★9

19 Hexagon socket head cap screw

3

43 O ring1

20 Hexagon socket head cap screw

6

44 C cap

6

21 Stop bolt

3

45 O ring3

22 Jaw attaching bolt

6

46 Eye bolt

3

47 Eye bolt

★10

12

23 Chuck attaching bolt

62

*1. 12” : 3 pieces.
*2. Exclude 12” and 15”.
*3. 12” : 3 pieces.
*4. 12”, 15”, 18”, 21” and 24” : 18 pieces. 28” : 24 pieces. 32”, 36” and 40” : 30 pieces.
*5. 12” : Lead ball 3 pieces.
*6. Exclude 12” and 15”.
*7. Exclude 12”, 15” and 18”.
*8. Exclude 12”, 15” and 21”.
*9. 12”, 15” and 21”.
*10. Exclude 12”, [46] Eye bolt is used combined in 15”, 21”, 24”, and 28”.

8

2.

Important Safety Precautions

Important safety precautions are summarized below. Please read this section before firststarting to use this product.
Failure to follow the safety precautions below will result in

DANGER serious 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)

During spindle rotation, do not turn off hydraulic pump power supply anddo not operate switching valve.
For All Users・

Cutting off hydraulic pressurecauses a drop in the gripping
force which could result in thework being released and flyingout.

・

Operating the manual switchingvalve or solenoid valve will leadto a drop of hydraulic pressure.
9

Important Safety Precautions
Failure to follow the safety precautions below will result in

DANGER serious injury or death.

Do not allow the rotation speed of the chuck to exceed the maximum
allowable speed limit. (Refer to pages 16-26)
For All Users
・

If the rotation speed of thechuck exceeds the rotation
speed limit, this is very
dangerous as the chuck andwork will fly out.

The input force of the chuck (piston thrust, pulling force of the draw pipe)
must not exceed the allowable maximum input force.
(Refer to pages 16-26)
・

Input
must
match
the
specification of the chuck.

・

Adjust the hydraulic pressure
to the cylinder so that the
input force, which determines
the gripping force of thechuck, does not exceed.

・Excessive input force canlead to breakage of thechuck,
which
is
very
dangerous, as the chuck canwork can be damaged and fly
out.

10

For All Users

Important Safety Precautions
Failure to follow the safety precautions below will result in

DANGER serious injury or death.

Keep the height of the jaw within the range specified in the gripping force
limit table (Refer to page 22-26). If you must use a jaw taller than astandard soft jaw, use less than the input (piston thrust force, draw pipe
drawing force) specified in the gripping force limit table.
For All Users
・

Do not use a jaw of a height 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.
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.

Determine the gripping force required for processing by the machine tool
manufacturer or user, and check that the required gripping force isprovided before processing.
For All Users(Refer to pages 18-26 and cylinder manual)・Adjust the hydraulic pressure to thecylinder to obtain the required gripping
force. If the gripping force is insufficient,
this is dangerous as the work will fly out.

11

Important Safety Precautions
Failure to follow the safety precautions below will result in

DANGER serious injury or death.

Use of a chuck and cylinder that cannot be used together safely may
cause the cylinder to break at high pressure resulting in the chuck andwork flying out.
For All Users
・

Check that the chuck and the cylinder are in the “safe combination” when using at highpressure with our company or the distributor. Especially when the cylinder of ourcompany and a high pressure chuck of other company are combined, confirmation isnecessary.

・

If one of the abnormal events shown below occurs during operation, immediately stop
the machine and consult with our company or the distributor.
・The work slips.

・

Loss of accuracy.
The work begins to chatter.
The machine's vibration significantly
increases.
The griping force does not rise even if・・・

hydraulic pressure is raised.
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.

12

Important Safety Precautions
Failure to follow the safety precautions below will result in

DANGER serious 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.

13

Important Safety Precautions
Failure to follow the safety precautions below will result in

DANGER serious injury or death.

Provide sufficient strength for the draw bar (Refer to pages 45-48).
Provide sufficient screw depth for the draw bar.
Firmly tighten the draw bar.
For Machine Tool Manufactures
・If the draw bar break, the gripping force is instantly
lost and this is dangerous as work will fly out.

・

If the screw depth of the draw bar is insufficient, thescrew will break and the gripping force will be lost
instantly, and this is dangerous as work will fly out.
If the engagement of the screw of the draw bar is・・loose, vibration may occur resulting in breakage ofthe screw. If the screw breaks, the gripping force will
be lost instantly, which is dangerous as the work will
fly out.
If the draw bar is unbalanced, vibration occurs, thescrew is broken and the gripping force will be lost
instantly, which is dangerous as the work will fly out.
Use a cylinder with a lock valve (safety valve, check valve) incorporated incase of sudden hydraulic pressure drop due to blackout, malfunction of
the hydraulic pump, etc. Further, use a solenoid valve with a circuit thatretains the gripping position when no current is carried.
For Machine Tool Manufactures

・If the hydraulic pressure
suddenly drops due to blackout
or malfunction of the hydraulicpump, etc., this is dangerous
as work will fly out.

・

Lock valve retains the hydraulicpressure inside the cylinder
temporarily, when the hydraulicpressure suddenly drops dueto blackout or malfunction of
the hydraulic pump, etc.

14

Important Safety Precautions
Failure to follow the safety precautions below could result in

WARNING 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 chuck
and the work may fly out, which is dangerous.

・If you attach a locator or jig on the chuck bodysurface, only process work in an acceptable
range (Refer to page 34).
Periodically supply adequate grease (Refer to page 35). Turn off power
before adding grease.
For All Users

・

Insufficient grease supply lowers the gripping
force, causes operation failure due to lower
hydraulic pressure, lowers the gripping precision,and causes abnormal wearing and seizing, etc.

・This is dangerous as the work could fly out froma drop in the gripping force.
Do not operate the machine
after drinking alcohol or taking
medication.
For All Users

・

Do not operate the machine wearing
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.
15

3. Specifications
3-1. Specifications
Table 2-1
Type

NV12

NV15

NV18

NV21

Plunger stroke

mm

30

35

35

35

Jaw stroke（in diameter）

mm

10.5

16

16

16

kN

39

82

82

82

(kgf)

(3977)(8362)(8362)(8362)

kN

147

247

247

272

(14990) (25187)(25187)(27736)

Allowable maximum input force

Maximum static gripping force
(kgf)
-1

Allowable maximum rotation speed

min

3100

2900

2600

1800

Standard soft jaw height (Z axis)

mm

54

64

64

74

φ26～

φ72～

φ133～

φ69～

304

381

450

530

77

―

―

―

―

121

159

216

―

133

171

210

0.80

―

―

―

―

2.18

2.9

5.55

―

2.58

3.3

5.45

Gripping range

mm（outside diameter gripping）
nose of 8Mass（standard soft jaw included）

nose of 11kg

nose of 15
nose of 8
Moment of inertia

nose of 11

kg・m

2

nose of 15
Matching cylinder

hydraulic Y1530R Y2035R Y2035R Y2035R

Maximum hydraulic pressureMPa2(with matching cylinder)(kgf/cm )Balance quality

3.2

3.2

3.2

(27.4)(32.6)(32.6)(32.6)

G6.3(standard soft jaw not include)
Storing temperature /-20 ~ +50 °C / -10 ~ +40 °C

Operating temperature

Reference: 1kN = 101.97kgf

2.7

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.

16Table 2-2
Type

NV24

NV28

NV32

NV36

NV40

Plunger stroke

mm

35

35

35

35

35

Jaw stroke（in diameter）

mm

16

16

16

16

16

kN

82

82

82

82

82

(kgf)

(8362)(8362)(8362)(8362)(8362)

kN

272

272

272

272

272

Allowable maximum input force

Maximum static gripping force(27736) (27736) (27736) (27736) (27736)

(kgf)
-1

Allowable maximum rotation speed

min

1700

1200

1100

1000

800

Standard soft jaw height (Z axis)

mm

74

74

74

74

74

φ152～ φ152～ φ152～ φ152～ φ152～

Gripping range

mm（outside diameter gripping）
nose of 11
Mass（standard soft jaw included）

nose of 15kg

nose of 11
Moment of inertia
Matching cylinder
Maximum hydraulic pressure(with matching cylinder)

nose of 15

kg・m

2

610

700

800

914

1000

259

406

451

606

776

253

400

445

600

770

7.7

22.1

35.6

62.6

96.6

7.575

22

35.5

62.5

96.5

hydraulic Y2035R Y2035R Y2035R Y2035R Y2035R
MPa
2(kgf/cm )Balance quality

3.2

3.2

3.2

3.2

3.2

(32.6)(32.6)(32.6)(32.6)(32.6)

G6.3(standard soft jaw not include)
Storing temperature /-20 ~ +50 °C / -10 ~ +40 °C

Operating temperature

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.

173-2. Relationship between gripping force and rotation speed
1. Maximum static gripping force
The static gripping force is the gripping force when the chuck is at a stop.
The power chuck has a mechanism to convert input force (piston thrust force, draw bar
drawing force) from the cylinder to gripping force. Therefore, the gripping force when theallowable maximum input force 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 Kitagawa standard soft jaw is used as the jaw.

・The attaching bolts of the soft jaw are tightened at the specified torque. (Refer to page
13)

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

・・

CHUCK GREASE PRO is used. (Refer to page 36).
A variable displacement pump with the discharge volume of 20 liters/min or more isused as the hydraulic source. The pressure is set by the pressure control equipment of
the pump itself, or the pressure reduction valve equipped separately.

Fig.5

18

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. Theoreticalvalues for models NV. 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.
In the center of the jaw stroke. And the soft jaw is attached at the position where theperiphery side end of the soft jaw and the chuck periphery are almost lined up.

・The gripping position is at a position 1/2 of the height of the soft jaw top surface (heightfrom 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 20-26.
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.

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.6-7 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.
19

Fig.620

Fig.7・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.

21

3-3. Relationship between gripping part center height, static
griping force and input force / Relationship between top jaw
mass moment and gripping force loss
If the gripping part center height of the used top jaw (dimension H in Fig. 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 input force than the allowable maximum input force.
Additionally, if the top jaw is larger and heavier, the centrifugal force generated at the top
jaw will increase. It is necessary to examine the dynamic gripping force considering 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.9-11)

・

If a top jaw is taller than the standard soft jaw, use it at the input force (piston
thrust force, draw bar drawing force) specified in the gripping force limit table.
If it is used without lowering the input, the chuck will break and this isdangerous as the chuck and work will fly out.

22

Fig.923

Fig.1024

Fig.1125

Analysis of the gripping force, input force and rotation speed using Fig. 9-11 is carriedout as shown below.
・ For example, in the case of NV24 standard soft jaw (mass moment 3423kg・mm), it
cannot exceed 1700min-1 (rpm), and the gripping force loss due to the centrifugal
force at this rotation speed is 181.3kN (approx. 18487kgf). 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 272kN, and therequired input to obtain this gripping force is 82kN. However, it is necessary to use at
the gripping part center height H=37mm or less.
・

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

・・

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

The required static gripping force and input force required at the rotation speed in use are
predicted from Fig.9-11, 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 with 3 jaw chuck. If 2 jaws are used for gripping reduce the input force
by 1/3 or more with 3 jaw chuck. If it is used without lowering the input, which
is normally applied evenly onto 3 of the jaws is concentrated onto 1 or 2 of thejaws. Otherwise the chuck will break, the work will fly out and this isdangerous.

・In the case of inner diameter gripping, the input force needs to be lowered
because the gripping force increase due to the centrifugal force. Otherwise
the work will deform or break due to large gripping force, work will fly out andthis is dangerous.

26

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.12)・

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.12
・

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 3
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

27

・

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 2mmfrom the bottom of the T nut (Refer to Fig.13).

・

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.13

Do not rotate the chuck so that the T nut is loosened causing the jaw to fly out.
Check that the reference mark on the protector of the No. 1 master jaw iswithin the range of the entire stroke as shown in Fig. 14. Full stroke the jaw atleast once a day to check it before work or when supplying grease, etc. If it
goes out of the range of appropriate stroke due to loosening of the draw nut,
etc., the work may not be gripped, and this is dangerous as the work will fly
out.

・When gripping the work, use it by keeping the position of the master jaw within
the appropriate stroke range. Gripping in the center of the stroke is the moststable for the mechanism, and the best precision can be obtained.
・

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.1428

Table 4
Type

Appropriate stroke range(mm)

NV15

5.0

NV18

5.0

NV21

5.0

NV24

5.0

NV28

5.0

NV32

5.0

NV36

5.0

NV40

5.0

29

4-2. Forming soft jaw with outside diameter gripping
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 thejaw 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.

30

4-3. Forming soft jaw with inside diameter gripping
1. Preparation of the ring for forming
・Prepare the ring for forming. The surface roughness of the ringinside diameter is to be approximately 25s, and make a shapewith a sufficient thickness which does not distort.

・

It is convenient to prepare various inside diameter dimensions
for dimensions of forming parts.

2. Process of the ring gripping part for forming・Operate the switch valve and minimize the jaw to close.

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

・

φD = φd - (jaw maximum stroke/2)

3. Gripping of the ring for forming・

By operating the switch valve, grip the ring for forming in theφD part. At this time, grip by pressing the ring on the jaw inorder for the ring not to be tilted. Repeat chucking several
times to stabilize the ring.

4. Forming・Process the gripping part (dimension φD’) of the work in thestate that the ring 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 when forming the same as whenprocessing of the work, or slightly higher. Additionally, in thecase of inside diameter gripping, it is necessary to use theinput at 1/2 of the allowable maximum input or less.

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

5. Trial cutting・

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

・

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

・Contacting on the gripping surface is to be 2 points contact of
the side A and the side B when gripping.
31

4-4. 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.

32

5. Usage
This product is a device to fix a work-piece when it is processed by the lathe machine or therotary table.
The rotary cylinder closes the jaw and fixes a work-piece so that it does not move during
processing. The chuck opens the jaw after having processed it and remove a work-piece.

・

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 thechuck, do not get fingers or hands
become caught. This could cause
crushed or cut fingers and hands.

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

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.

33

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.

34

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
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.

35

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. 15.

Fig.15
Table 5Type

A (mm)B (mm)C (mm)

NV12

55

95

20 or less

NV15

60

110

30 or less

NV18

60

140

30 or less

NV21

60

120

30 or less

NV24

65

160

30 or less

NV28

65

160

30 or less

NV32

65

160

30 or less

NV36

65

160

30 or less

NV40

65

160

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

・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.

366. Maintenance and Inspection
6-1. Periodic Inspection
・・

Add grease at least once a day.
Fully stroke the jaw before starting work or upon supplying grease, and check that thejaw is inside the appropriate stroke area. (Refer to page 28)

・

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 10,000 strokes (onceevery 2 months or more for cutting cast metal).

6-2. Grease lubrication
1. Position to lubricate
・

Lubricate using a grease gun from the grease nipple on the body periphery part or eachmaster jaw periphery part. Supply grease when the jaw is open. After lubrication, repeat
opening and closing the jaw several times without gripping work.

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

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
・・

Add grease once every day.
Add approximately 5g up to 8 inches and 10g for 10 inches or larger of grease to theeach master jaw. Check the filling degrees of the grease after removing the cover of thechuck center.

・In the case of high rotation or in the case of using a large amount of water soluble
coolant, increase the frequency of lubrication according to the usage conditions.
37

・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.

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.

6-3. Disassembling
Disassembling procedures
Read the following disassembling procedures with reference to page 7-8.
1. The piston is pulled to the last minute and turn off the main power of the machine before
starting work.
2. Set up the eye-bolt [46] in the screw hole in outer of body by 3 equi spaced.
3. Loosen the jaw attaching bolt [22] and remove the soft jaw [4] and the T nut [5].
4. Remove the chuck attaching bolt [23].
5. Remove the cover cap [15] and hexagon socket head cap screw plug [40]. Loosen thedraw screw [7] by using the handle [11]. Then lift up the chuck little by little. (There is no
hexagon socket head cap screw plug [40] in NV12, NV15 and NV21)
6. Turn the surface below and put the chuck.

38

7. Loosen the hexagon socket head cap screw [19] and remove the back plate [16].Theback plate [16] of NV15（nose of 15）and NV18（nose of 15）and NV21～NV40(nose of11) are installed in the lathe.
8. Loosen the set screw [25] and remove lead ball [29].
9. Loosen the draw tube [8] and remove it from the wedge plunger [2].
10. Lift up once and upset the chuck. Then put body [1] on the pillow for the interference
prevention of wedge plunger [2] and cover [6].
11. Loosen the hexagon socket head cap screw (low head)[37] and remove protector [14]and spacer [13].
12. Loosen the hexagon socket button head cap screw [24] and remove scraper L [12] andscraper R [12].
13. Loosen the hexagon socket head cap screw [18] and remove cover [6]. (O-ring [45] isbonded to cover [6] with the glue.)
14. Lift up once and upset the chuck. Be careful to the wedge plunger [2] doesn't drop fromthe body [1].
15. Remove the stop bolt [21].
16. Remove the wedge plunger [2] to the body [1] rear side. (NV15 are different thestructure. Remove the wedge plunger [2] to the body [1] front side.)
17. Remove the master jaw [3] to the outer periphery side of the chuck.
18. The draw screw [7] is assembled in the draw tube [8] to adjust the wedge plunger [2]position. Usually the draw screw [7] may not disassemble. Read the following
procedures if it is disassembled.
Loosen the set screw [26] on the draw nut [9], and remove the draw nut [9] from thedraw screw [7]. Save the steel ball [28] and the spring [10] carefully.
Assembling procedures
Read the following assembling procedures with reference to page 7-8.
Assemble again while sufficiently coating the recommended grease in the reverse
procedures of disassembling. At this time, pay sufficient attention so as not to make a
mistake in the numbers of the body [1], the wedge plunger [2], the master jaw [3], the softjaw [4], the cover [6], and the protector [14]. Other parts are assembled to the same
position before it resolves.

39

Read the following disassembling procedures when you assemble draw screw [7]. (Refer toFig.16)
1. Install the draw screw [7] to draw tube [8].
2. Put the spring [10] and the steel ball [28] in a hole of the draw tube [8].
3. Install the draw nut [9] to the draw screw [7].
4. Slightly loosen the draw nut [9] from the tightened situation and adjust the clearance
between the draw nut [9] and draw tube [8]. Proper clearance: 0.05～0.15.
5. Screw the set screw [26]. Sufficiently screw the set screw [26] onto the draw screw [7] atthe recommended torque of 1.3～1.4 times.
6. Stake the set screw [26] to prevent loosing.

Fig.16・

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.

Chuck size

40

(inch)

Eyebolt

12,15”

M12

18～28”

M16

32”

M20

36,40”

M24

・

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.

・The plunger projects from the body. Put body on the pillow for the interference
prevention of wedge plunger and cover.

・Disassemble and clean the chuck at least once every 6 months or every 10,000
strokes (once every 2 months or more for cutting cast metal). If cutting powder
or other substances stagnate inside the chuck, it will lead to insufficientstroke and a drop in the gripping force, and this is dangerous as the work will
fly out. Check each part carefully and replace any part that is worn or cracked.

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

・After assembling, measure the gripping force according to the method on
page 18, 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 hydraulicpressure or the cylinder can stop or malfunction.

41

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

Cause

Countermeasure

The chuck

The chuck inside will break.

Disassemble and replace the broken part.

does notThe sliding surface is seized.

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

operate.

Check the piping and the electric system, and if there is no abnormality,
The cylinder is not operating.
disassemble and clean the cylinder.

InsufficientA large amount of cutting powder is inside. Disassemble and clean.

stroke of the
The draw pipe loosened.

Remove the draw pipe and retighten it again.

jaw.
Adjust so that the jaw is near the center of the stroke when gripping the
The stroke of the jaw is insufficient.
work.
The gripping force is insufficient.

Check that the correct hydraulic pressure is obtained.

The forming diameter of the top jaw is not
Form again based on the correct forming method.
consistent with the work diameter.
The Work

Calculate the cutting force and check that it is suitable for the specification
The cutting force is too large.

slips.

of the chuck.
Supply grease from the grease nipple, and open and close the jaw several
Insufficient grease lubrication
times without gripping a work.
The rotation speed is too high. Swinging
Lower the rotation speed to a speed at which the required gripping force
occurs due to incorrect alignment of corescan be obtained. Align the cores sufficiently to eliminate such swinging.
of work feeder, steady rest, tail stock, etc.
The outer periphery of the chuck is Check the end surface run-out and the outer periphery, and retighten therunning out.

chuck attaching bolts.

Dust is attached on the serration part of
Remove the top jaw, and clean the serration part thoroughly.
the master jaw and the top jaw.

Precision
failure.

The attaching bolt of the top jaw is not

Tighten the top jaw attaching bolt at the specified torque.

tightened sufficiently.

(Refer to page 27)

The forming method of the soft jaw is Is the plug for forming parallel to the chuck end surface? Is the plug for
inappropriate.

forming not deformed due to the gripping force?

The height of the top jaw is too high, theLower the height of the top jaw. (Replace it with the standard size) or check
top jaw is deformed, the top jaw attaching
the gripping contact surface and make it uniform.
bolt is elongated.
The gripping force is too large leading to Lower the gripping force in the range possible to process to preventthe work being deformed.

deformation.

42

・

If the chuck failed due to a seizure or breakage, remove the chuck from themachine, following the disassembly steps in page 37. When the jaws andcovers cannot be removed due to a blockage of workpiece, do notdisassemble 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.

7-2. 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.

8. Attachment
8-1. Outline drawing of attachment

Fig.1744

・

Attach the manual switching valve at a position where it is easy to operate for theattaching equipment.

・Install the hydraulic unit at a position where the drain hose is not kinked and the needleof the pressure gauge is easily read.

・When other actuators are operated by the same hydraulic pressure source as
the cylinder for chuck, be sure that a pressure drop of the cylinder does notoccur during use. A hydraulic pressure drop leads to a drop in the gripping
force which could allow the work to fly out.

・As to the drain hose・・

Use a transparent vinyl hose for visualization.
Provide a stream slope, without air pocket. This will ensure no backpressure.

・・ The end of the hose is physically above the oil level. (Refer to Fig.17)
If the hydraulic oil stagnates inside the cylinder, oil leakage occurs, which may
cause a fire.

・Install after removing the dust inside the pipe completely.

・

Add a filter to the pressure supply line. If foreign matters gets inside thecylinder, this is dangerous since the rotation valve of the cylinder will seize,
the hose will tear off, and the cylinder will rotate. This is also dangerous as thework will fly out.

・Always use a flexible hose for the hydraulic piping to the cylinder, and thebending force or tensile force of the pipe must not be applied to the cylinder.
Use a pipe inside diameter as large as possible and keep the piping length as
short as possible.

・

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

45

8-2. Production of draw pipe
1.Dimensions of power chuck
Table 8Type (nose)

D
A

B

6-C

NV12 （08）

148

171.4

NV15 （11）168

NV15 （15）

Fig

MAX.

MIN.

M16×145

67

37

18-1

235

M20×170

95

60

18-1

172

330.2

M24×55

91

56

18-2

NV18 （11）

168

235

M20×170

95

60

18-1

NV18 （15）

172

330.2

M24×55

91

56

18-2

NV21 （11）

167

235

M20×80

91

56

19-1

NV21 （15）

167

330.2

M24×170

91

56

19-2

NV24 （11）

167

235

M20×80

91

56

19-1

NV24 （15）

167

330.2

M24×160

91

56

19-2

NV28 （11）

167

235

M20×80

91

56

19-1

NV28 （15）

167

330.2

M24×160

91

56

19-2

NV32 （11）

167

235

M20×80

91

56

19-1

NV32 （15）

167

330.2

M24×160

91

56

19-2

NV36 （11）

167

235

M20×80

91

56

19-1

NV36 （15）

167

330.2

M24×160

91

56

19-2

NV40 （11）

167

235

M20×80

91

56

19-1

NV40 （15）

167

330.2

M24×160

91

56

19-2

Fig.18-1

Fig.18-2
46

Fig.19-1

Fig.19-2

・

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.

・

Use the bolts attached to the chuck, and do not use other bolts. However, if
you must use other bolts not provided by Kitagawa, use bolts that have atleast a strength classification of 12.9 (10.9 for M22 or more) and be sure they
are long enough.

Table 9Bolt 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

47

2.Production of draw pipe

Fig.20

Fig.21
Table 10Type

CylinderBC

D (min)E

F

L

NV12A0800

Y1530R

43

M30

45

M20

41

A-98

NV15A1100

Y2035R

55

M36

55

M30

60

A-134

NV15C1500

Y2035R

55

M36

55

M30

60

A-130

NV18A1100

Y2035R

55

M36

55

M30

60

A-134

NV18C1500

Y2035R

55

M36

55

M30

60

A-130

NV21A1100

Y2035R

55

M36

55

M30

60

A-130

NV21C1500

Y2035R

55

M36

55

M30

60

A-130

NV24A1100

Y2035R

55

M36

55

M30

60

A-130

NV24C1500

Y2035R

55

M36

55

M30

60

A-130

NV28A1100

Y2035R

55

M36

55

M30

60

A-130

NV28C1500

Y2035R

55

M36

55

M30

60

A-130

NV32A1100

Y2035R

55

M36

55

M30

60

A-130

NV32C1500

Y2035R

55

M36

55

M30

60

A-130

NV36A1100

Y2035R

55

M36

55

M30

60

A-130

NV36C1500

Y2035R

55

M36

55

M30

60

A-130

NV40A1100

Y2035R

55

M36

55

M30

60

A-130

NV40C1500

Y2035R

55

M36

55

M30

60

A-130

48

The dimension L in Fig.20,21 is determined from the distance A between the cylinder
adapter and the back plate.
(Example) In the combination of NV24, Y2035R, and when A=800mm, the draw pipe length
L is to be L = A – 130 = 800 – 130 = 670mm.
At the time of the screw process of the dimension C, the precision is to be JIS 6H and 6h,
6g matching the screw of the piston of the cylinder. Pay attention so that the thread parts on
both ends and the inner periphery do not swing or become unbalanced.

・

Provide sufficient strength for the draw bar. If the draw bar is broken due toinsufficiency of the strength, the gripping force will be lost instantly, which isdangerous as the work will fly out.
・Keep the dimension D in Fig. 20 for the draw bar and a material with thetensile strength 380MPa (38kgf/mm2) or more must be used.

・The personnel who designed draw bar must judge whether the strength ofthe draw bar is sufficient for the usage conditions.

・The dimensions and materials specified in this manual do not guaranteethat the draw bar will not break under every usage condition.

・

If the screw-in depth of the draw bar to the draw screw is insufficient, thescrew will break and the gripping force will be lost instantly, which isdangerous as the work will fly out.

・

If the engagement of the screw of the draw bar is loose, vibration may occur
resulting in breakage of the screw. If the screw breaks, the gripping force will
be lost instantly, which is dangerous as the work will fly out.

・

If the draw bar is unbalanced, vibration occurs, the screw is broken and thegripping force will be lost instantly, which is dangerous as the work will fly
out.

49

8-3. Attachment of chuck
1.Connect the draw tube to wedge plunger
・The draw tube is packed as a separate unit because of packing reason. Install thedraw tube to the plunger with a spanner. Then install the lead ball and the set screw.,so that it may not be loosened. (Refer to Fig.22)

Fig.22
2. Attaching the draw bar to the cylinder
・

Apply adhesive onto the screw part of the draw bar, and screw it into the piston rod ofcylinder. At this time, refer to the instruction manual for the cylinder for tightening torque.

・

When attaching the draw bar to the cylinder, the stopper pin of the piston may breakif tightened at the stroke middle position of the piston. In the case of a Y typecylinder, screw it in so that the piston rod is fully in. Follow the explanation of the
instruction manual for the cylinder for other items about the cylinder.

・

Use the cylinder that matched the stroke of the chuck. The cover is damaged if you
use the cylinder that have longer stroke than the chuck, because the jaws move fora long distance.

503. Attach the cylinder to the spindle (or the cylinder adapter)・

Please refer to the manual of the cylinder when you install the cylinder.

・・

Check the run-out of the cylinder, and if it is normal, attach the hydraulic pipe.
Move 2 to 3 times at low pressure (0.4 MPa-0.5 MPa, 4 - 5 kgf/cm2) and set the piston at
the forward end and turn off the power supply.

4. Connect the chuck to the draw bar
・Remove the cover cap at center of chuck, and hexagon socket head cap screw plugthat is attached to wedge plunger. (There is no hexagon socket head cap screw plug in
NV12, NV15 and NV21)・

Please install the eyebolt in the screw hole at the periphery of the body (3 equi spaced),
and lift up the chuck so as not to become unbalanced.

・

Insert the handle or the hex key to the chuck center hole, to connect to the draw bar
while turning the draw screw. Then drop the chuck little by little.

・When connecting the draw screw and the draw bar, do not forcibly screw them in if theycannot be screwed smoothly, but check the inclination of the core of the screw, etc.

・

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.

Chuck size

51

(inch)

Eyebolt

12,15”

M12

18～28”

M16

32”

M20

36,40”

M24

・

When the chuck is lifted up with the crane, and installs it in the lathe ofvertical, please install the eyebolt in the screw hole at the periphery of the
body (3 EQUI spaced), and lift up the chuck so as not to become unbalanced.

・

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.

・Don't remove the cover when the chuck is installed in the lathe and detaches
it. It might injure and are dangerous, because the wedge plunger might dropwhen removing a cover and working.

・Note that the plunger doesn't collide with the cover when turning a draw
screw.

・

If the screw-in depth of the draw bar to the draw screw is insufficient, thescrew will break and the gripping force will be lost instantly, which will thework to fly out.

・

If the engagement of the screw of the draw bar is loose, vibration may occur
resulting in breakage of the screw, loss of gripping force and the work flyingout.

5. Attach the chuck matching to the attaching surface of the spindle (or the backplate).
・

Turn the handle for connection to make a state that the chuck closely contacts thespindle attaching surface of the lathe.

・In the case of adjusting the centering of the chuck, hit the body side face with a plastic
hammer after lightly tightening the chuck mount bolt. Keep the periphery run-out and theend surface run-out of the chuck at 0.02mm T.I.R or less.

52

6. Adjust the position of the wedge plunger
・The appropriate position of the wedge plunger at the cylinder forward end is the position
when the dimension A in Fig.23 becomes as shown in the table below.（Distance fromsurface of cover to the hexagon socket head cap screw plug attaching surface of thewedge plunger in case of NV18 and NV24~40. Distance from surface of cover tosurface of the wedge plunger in case of NV12, NV15 and NV21.）

・At this time, check that the reference mark on the protector of the No. 1 master jaw iswithin the range of the entire stroke mark. (Refer to page 28).

・A click stop (rotation stopper) is also attached to the draw nut, so complete adjustment
at the position where this response is felt.

・Tighten the chuck attaching bolt evenly after adjusting the position of wedge plunger. At
this time, tighten the bolts at the specified torque.

Fig.23
Table 11Type

A (mm)

NV12

12

NV15

16.5

NV18

20.5

NV21

12

NV24

21

NV28

21

NV32

21

NV36

21

NV40

21

53

・

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.

・

Use the bolts attached to the chuck, and do not use other bolts. However, if
you must use other bolts not provided by Kitagawa, use bolts that have atleast a strength classification of 12.9 (10.9 for M22 or more) and be sure they
are long enough.

Table 12
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

7. Attach the cover cap and check the run-out of the chuck・

Attach the cover cap and hexagon socket head cap screw plug to the center of thechuck. When chuck is used with the vertical lathe, C-cap can be installed. C-cap isinstalled so that neither cutting powder nor Coolant may mix with spot facing.

・

Keep the periphery run-out and the end surface run-out of the chuck at 0.02mm T.I.R or
less.

・

Full stroke the jaw and check that the reference mark on the protector of the No. 1
master jaw is within the range of the entire stroke mark. (Refer to page 28).

54

9. Other information
9-1. About standards and orders
This product is based on the following standards or orders.
・・・

Machinery directive:2006/42/EC Annex I
EN ISO 12100:2010
EN1550:1997+A1:2008

9-2. Information about markings of productFig.2455

9-3.About disposal
Ultimate disposal of this product should be handled according to all national laws andregulations.

56

--- memo ---57

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: NV series(Models NV12, NV15, NV18, NV21, NV24,
NV28, NV32, NV36, NV40)

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

Sendai office

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

Nagoya office

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

Osaka office

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

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

Kyushu office

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

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

 OVERSEASKITAGAWA-NORTHTECH INC.
America Contact

https://www.kitagawa.us301 E. Commerce Dr,Schaumburg,IL. 60173 USA
Tel. +1 847-310-8787
Fax. +1 847-310-9484

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 Office

http://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 (THAILAND) CO., LTD. Bangkok Branch
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

http://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

http://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 the related regul ation prior to any transaction.