Kitagawa SC N Series User manual

Version 1.04 (2011.04.01)
Original instructions
INSTRUCTION MANUAL
SC-(F)N / JN-(T)N type
Scroll Chuck for Rotary Table
・ This instruction manual is for production engineers and maintenance
personnel in charge of operation of this product. When a beginner uses
this product, receive instructions from experienced personnel, the
distributor 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, please
confirm them with the distributor or our company.
DANGER
KITAGAWA IRON WORKS CO., LTD.
77-1 Motomachi, Fuchu, Hiroshima 726-8610 Japan
TEL [phone]
FAX [phone]

Preface
This manual provides detailed information about how to safely and correctly use the scroll
chuck (SC-N, SC-FN, JN-N, JN-TN type) for a rotary table.
Before starting to use this scroll 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 are
classified and displayed as shown below depending on the damage of risk including the
seriousness of the harm that could result. Please sufficiently understand the meanings of
these terms and follow the instructions for safe operation.
Safety Alert Symbol
The triangle is the safety alert symbol used to alert you to potential safety hazards that
could result in injury or death.
1
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 in
damage to the equipment or a shortened work life.

2
Liability and How to Use this Manual
This product is suitable for gripping a workpiece on the rotary tables. This product is
equipped with the jaws to clamp the workpiece and they operate by the handle. For any
other applications, please contact us.
Our company will not assume responsibility for injury, death, damage, or loss resulting from
not following the instructions in this manual.
There are countless things that cannot or should not be done, and it is impossible to cover
all of them in this manual.
Therefore, do not perform any actions unless they are specifically allowed in this manual. If
any questions related to safety arise about operation, control, inspection and maintenance
which are not specified in this manual, please confirm them with our company or distributor
before performing them.
Guarantee and Limitation of Liability
The guarantee period of this product is 1 year after delivery.
Use the parts delivered by Kitagawa Iron Works for all the parts including consumable parts.
We will not assume responsibility for injury, death, damage, or loss caused by usage of
parts not manufactured by Kitagawa Iron Works. Additionally, if parts other than genuine
parts manufactured by Kitagawa Iron Works are used, this guarantee will be completely
invalid.

Table of Contents
1. Structural Drawing and Parts List -----------------------------------------------------------------------5
1-1. Type display
1-2. Structural drawing
1-3. Parts list
2. Important Safety Precautions ------------------------------------------------------------8
3. Specifications ----------------------------------------------------------------------------------------------12
3-1. Specifications
3-2. Gripping range
3-3. Relationship between handle torque and gripping force
4. Forming Soft Jaw ------------------------------------------------------------------------------------------17
4-1. Attachment of soft jaw
4-2. Forming soft jaw with outside diameter gripping
4-3. Forming soft jaw with inside diameter gripping
4-4. Forming method when you use forming jig
5. Usage --------------------------------------------------------------------------------------------------------22
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 ---------------------------------------------------------------------------26
6-1. Periodic Inspection
6-2. Grease lubrication
6-3. Disassembling
7. Malfunction and Countermeasures ------------------------------------------------------------------30
7-1. In the case of malfunction
7-2. Where to contact in the case of malfunction
8. Quality standard ------------------------------------------------------------------------------------------32
7-1. Runout accuracy
3

4
For Machine Tool Manufacturers (Chapter 9)
9. Attachment -------------------------------------------------------------------------------------------------33
9-1. Outline drawing of attachment
9-2. Manufacturing of back plate
9-3. Attachment of chuck
10. Other Information ----------------------------------------------------------------------------------------38
10-1. About standards and orders
10-2. Information about markings of product
10-3. About disposal

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. Parts list
Fig.3
6

7
Table 1 Quantity
No. Name SC-N SC-FN JN-N JN-TN
1 Body 1 1 1 1
2 Cover 1 1 1 1
3 Scroll 1 1 1 1
4 Pinion 3 3 3 3
5 Base jaw - - - 3
6 Top jaw - - - 3
7 Soft jaw - 3 - 3
8 Internal jaw 3 3 3 -
9 External jaw 3 3 3 -
10 Handle 1 1 1 1
11 Chuck attaching bolt 3 / 6 3 3 3
12 Jaw attaching bolt - - - 6
13 Cover attaching bolt 3 3 3 3
14 Grease nipple - - 1 1
14 Oil cup 1 1 - -
15 Knock pin 3 3 3 3
16 Hex key 1 1 1 1
17 Hex key - - - 1

2. Important Safety Precautions
Important safety precautions are summarized below. Please read this section before first
starting to use this product.
DANGER Failure to follow the safety precautions below will result in
serious injury or death.
Turn off main power supply before attaching, inspecting or replacing
chuck, and before adding oil.
8
・ The chuck may start rotation
suddenly, and a part of the body or
clothing may be caught.
For All Users
OFF
Close door before rotating spindle.
・ If the door is not closed, you may touch
the rotating chuck or the work may fly out,
which is very dangerous. (In general, the
safety interlock function which allows
rotation only when the door is the manual
mode or the test mode)
For All Users
When the protrusion of the work is long, support it with the steady rest or
center.
・ If the protrusion is long, the tip of the work
can turn and the work fly out.
For All Users

Important Safety Precautions
9
DANGER Failure to follow the safety precautions below will result in
serious injury or death.
Always tighten the bolts at the specified torque. If the torque is
insufficient or excessive, 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 bolts other than these.
・ If the torque is insufficient or
excessive, the bolt will break, which
is dangerous as the chuck or work
will fly out.
・ Fix the spindle or the chuck when
you tighten bolts. Your hand could
slip and get injury when you work
without fixing the spindle.
・ You cannot control the torque by a
hex key. You must use a torque
wrench for torque control.
・ Tightening torque is moment of force when you tighten a bolt. Tightening torque= F×L.
Specified torque for
socket head cap screw
Bolt size Tightening torque
M5 8
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
For All Users

Important Safety Precautions
10
WARNING
Failure to follow the safety precautions below could
result in serious injury or death.
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.
・ If the gripping force is insufficient, this is dangerous as the work will fly out.
For All Users
Use the handle attached to the product, and remove the handle after use.
・ The handle attached to the product comes to
come off by a spring automatically. If you use
other handle, the handle may scatter when
you forget to remove it.
・ Excessive handle torque can lead to
breakage of the chuck, this is dangerous as
the jaw and work will fly out.
・ If the handle torque is insufficient, this is
dangerous as the work will fly out.
For All Users
Use neither jaw that is taller jaw than standard jaw.
・ The moment hanging to the chuck becomes large when you use taller jaw and this is
dangerous as the chuck and work will fly out.
Be sure to use the chuck at the gripping range. (Refer to page 15)
For All Users
Be sure to use the chuck at the permissible protruding
range. (Refer to page 17)
● If exceeded the gripping range, the engaged part strength between the jaw and scroll
becomes insufficient, thus scattering the chuck jaw or work and resulting in danger.
For All UsersFor All Users

Important Safety Precautions
WARNING
Failure to follow the safety precautions below could
result in serious injury or death.
11
Do not modify the chuck in a way not permitted by the manufacturer.
・ 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 body
surface, only process work in an acceptable
range (Refer to pages 24-25).
Periodically supply adequate grease (Refer to page 26). Turn off power
before adding grease.
・ 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 from
a drop in the gripping force.
Do not operate the machine
after drinking alcohol or taking
medication.
Do not operate the machine wearing
gloves, a necktie, and other loose
clothing or
jewelry.
・ Dangerous since
these lead to
operation mistakes
and misjudgment.
・ Dangerous since
it will be caught.
Do not grip a chuck with a chuck.
・ Because it is easy to confuse the specifications of
each chuck and the protrusion become long, it is
apt to exceed the specifications of the base chuck.
The chuck may break and the chuck or work could
fly out.
For All Users
For All Users
For All Users
For All Users
For All Users

12
3. Specifications
3-1. Specifications
Table 2-1
Type SC-3N SC-4N SC-5N
kN 9.0 12.0 15.0
Maximum static gripping force (kgf) (918) (1224) (1530)
Thru-hole diameter mm 16 24 32
Mass kg 1.5 3.1 4.4
Moment of inertia kg・m20.001 0.004 0.009
N・m29.4 44.1 63.7Maximum permissible
handle torque (kgf・m) (3.0) (4.5) (6.5)
Balance quality G6.3
Storing temperature /
Operating temperature -20～+50℃/ -10～+40℃
Table 2-2
Type SC-5FN
Hard jaw SC-5FN Soft jaw JN06N JN06TN
kN 15.0 12.0 31.0 31.0
Maximum static gripping force (kgf) (1530) (1224) (3161) (3161)
Thru-hole diameter mm 32 32 45 45
Mass kg 4.4 4.4 8.4 9.0
Moment of inertia kg・m20.009 0.009 0.030 0.033
N・m63.7 51.0 88.3 88.3Maximum permissible
handle torque (kgf・m) (6.5) (5.2) (9.0) (9.0)
Balance quality G6.3
Storing temperature /
Operating temperature -20～+50℃/ -10～+40℃

13
Table 2-3
Type JN07N JN07TN JN09N JN09TN
kN 31.0 31.0 37.0 37.0
Maximum static gripping force (kgf) (3161) (3161) (3773) (3773)
Thru-hole diameter mm 55 55 70 70
Mass kg 12.2 13.0 21.2 22.0
Moment of inertia kg・m20.060 0.063 0.160 0.163
N・m107.9 107.9 147.0 147.0Maximum permissible
handle torque (kgf・m) (11.0) (11.0) (15.0) (15.0)
Balance quality G6.3
Storing temperature /
Operating temperature -20～+50℃/ -10～+40℃
Table 2-4
Type JN10N JN10TN JN12N JN12TN
kN 46.0 46.0 55.0 55.0
Maximum static gripping force (kgf) (4691) (4691) (5608) (5608)
Thru-hole diameter mm 85 85 96 96
Mass kg 28.0 29.0 41.0 43.0
Moment of inertia kg・m20.253 0.265 0.588 0.600
N・m176.5 176.5 206.0 206.0Maximum permissible
handle torque (kgf・m) (18.0) (18.0) (21.0) (21.0)
Balance quality G6.3
Storing temperature /
Operating temperature -20～+50℃/ -10～+40℃

14
Table 2-5
Type SC-14N SC-16N
kN 40.5 45.0
Maximum static gripping force (kgf) (4130) (4589)
Thru-hole diameter mm 100 110
Mass kg 54.0 74.0
Moment of inertia kg・m20.950 1.725
N・m225.6 245.0Maximum permissible
handle torque (kgf・m) (23.0) (25.0)
Balance quality G6.3
Storing temperature /
Operating temperature -20～+50℃/
-10～+40℃
Reference: 1kN = 101.97kgf 1MPa = 10.197kgf/cm2
When storing this product, the product should be subjected to the antirust treatment and
stored in a place free from wetting, condensation, or freeze.

3-2. Gripping range
Table 3
Gripping range
15
External gripping Internal gripping
Type
A1 A2 A3 A4 Soft jaw B1 B2 Soft jaw
SC-3N 2~35 33~55 53~70 2~35 - 24~44 42~64 -
SC-4N 3~43 41~69 67~95 3~43 - 29~57 55~84 -
SC-5N 3~46 44~77 75~110 3~46 - 33~67 65~100 -
SC-5FN 3~46 44~77 75~110 3~46 3-110 33~67 65~100 33~100
JN06N 3~64 62~112 110~160 3~64 - 48~100 98~150 -
JN06TN 3~64 62~112 110~160 - 3~160 55~104 102~150 55-150
JN07N 4~72 70~126 124~180 4~72 - 56~114 112~170 -
JN07TN 4~68 66~124 122~180 - 4~180 62~117 115~170 62~170
JN09N 5~84 82~150 150~220 5~84 - 62~137 135~210 -
JN09TN 5~80 78~150 148~220 - 5~220 70~141 139~210 70~210
JN10N 5~96 94~178 176~260 5~96 - 70~161 159~250 -
JN10TN 5~94 92~177 176~260 - 5~260 80~166 164~250 80~250
JN12N 10~108 108~204 202~300 10~108 - 86~189 187~290 -
JN12TN 10~108 108~204 202~300 - 10~300 90~191 189~290 91~290
SC-14N 25~118 116~210 208~315 25~118 - 107~188 186~290 -
SC-16N 25~132 130~215 213~360 25~132 - 113~212 210~340 -
SC-N,SC-FN,JN-N JN-TN
Fig.4

・ Be sure to use the chuck at the gripping range. If exceeded the above range,
the engaged part strength between the jaw and scroll becomes insufficient,
thus scattering the chuck jaw or work and resulting in danger.
・ Since there is a possibility that the jaw is protruded from chuck periphery by
the size of gripping diameter, take extreme care so as not to interfere with tool,
etc.
3-3. Relationship between handle torque and gripping force
Fig.5 shows relationship between handle torque and gripping force.
The gripping force is different depending on the state of grease lubrication, grease in use,
height of the jaw, etc. The maximum static gripping force specified in the specification is the
value under the following conditions:
・ The Kitagawa standard jaw is used as the jaw.
・ Tightened at the maximum permissible handle torque.
・ 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 jaw top
surface (height from the chuck surface to the top surface of the jaw).
・ Specified grease is used.
Fig.5
16

4. Forming Soft Jaw
4-1. Attachment of soft jaw
Use the most appropriate soft jaw considering the shape, dimension, material, and surface
roughness of the work and the cutting conditions, etc.
17
・ Be sure to use the chuck at the above permissible protruding range (Table 4).
If exceeded the above range, the engaged part strength between the jaw and
scroll becomes insufficient, thus scattering the chuck jaw or work and
resulting in danger.
Fig.6
Table 4
Type Permissible value of jaw protruded
from chuck periphery (mm)
SC-5FN 5 mm or less
JN06TN 16 mm or less
JN07TN 16 mm or less
JN09TN 18 mm or less
JN10TN 21 mm or less
JN12TN 30 mm or less

・ Always tighten the bolts at the specified torque. If the torque is insufficient or
excessive, the bolt will break, which is dangerous as the chuck or work will fly
out.
Table 5
Bolt size Tightening torque
M5 8
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
18

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 plug
outside diameter is to be approximately 25s, and make a shape
with 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 plug
and to guide with a bolt, etc.
2. Process of the plug gripping part for forming
・ Unclamp the jaws by turning the handle.
・ Then, process the φD part (part to grip the plug for forming).
・ Increase φD size more 0~some millimeter than φd. Arrange
jaw positions so that they are not protruded from the chuck
periphery.
3. Gripping of the plug for forming
・ Clamp the plug in the part of φD. At this time, grip by pressing
the plug on the chuck front surface in order for the plug not to
be tilted.
4. Forming
・ Process the gripping part (dimension φD’) of the work in the
state that the plug is kept gripped. The φD’ part is to be
approximately the same diameter (H7) as the diameter of the
gripping part of the work, and process to be surface roughness
at 6s or less.
・ Set the handle torque during forming the same as during
processing of the work, or slightly higher.
・ When the plug distorts, lower the handle torque or change the
plug into a shape which does not easily distort.
5. Trial cutting
・ Remove the plug for forming and grip the work.
・ 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 Aand the side B when gripping.
19