Kitagawa BS300 User manual

Version 1.10 (2021.08.03)
Original instructions
INSTRUCTION MANUAL
BS300 type
Large Thru-Hole High Precision Power Chuck
Kitagawa Corporation
77-1,Motomachi,Fuchu-shi,Hiroshima,726-8610,Japan
TEL [phone]
FAX [phone]
・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

1
Preface
This manual provides detailed information about how to safely and correctly use the power
chuck (BS300 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 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.
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 lathes or rotary tables. This product
is 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 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 Corporation 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 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 must
use a part not made by Kitagawa, check with us or our distributor to be sure it is safe to do
so. We will not be responsible for injury, death, damage or loss caused by use of a chuck
or cylinder made by another company unless this use has been approved by Kitagawa or
its distributor.

3
Table of Contents
1. Structural Drawing and Parts List -----------------------------------------------------------------------5
1-1. Type display
1-2. Structural drawing
1-3. Scope of product
1-4. Parts list
2. Important Safety Precautions ------------------------------------------------------------8
3. Specifications ----------------------------------------------------------------------------------------------15
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 ------------------------------------------------------------------------------------------23
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 --------------------------------------------------------------------------------------------------------28
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 ---------------------------------------------------------------------------32
6-1. Periodic Inspection
6-2. Grease lubrication
6-3. Disassembling
7. Malfunction and Countermeasures ------------------------------------------------------------------35
7-1. In the case of malfunction
7-2. Where to contact in the case of malfunction

4
For Machine Tool Manufacturers (Chapter 8)
8. Attachment -------------------------------------------------------------------------------------------------37
8-1. Outline drawing of attachment
8-2. In the case that the back plate must be manufactured (BS300 series)
8-3. In the case of with back plate (BS300A series)
8-4. Attachment of chuck
9. Other Information ----------------------------------------------------------------------------------------48
9-1. About standards and orders
9-2. Information about markings of product
9-3. About disposal

5
1. Structural Drawing and Parts List
1-1. Type display
Type display as shown below
Fig.1
1-2. Structural drawing
Fig.2

6
1-3. Scope of product
This 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 the
chuck is extremely important. Thoroughly read the “Important Safety
Precautions”on and after page 8 in this manual.
・As for the cylinder, follow the instruction manual for the cylinder.

7
1-4. Parts list
Fig.4
Table 1
No.
Part name
Quantity
No.
Part name
Quantity
1
Body
1
14
Chuck attaching bolt
3
2
Wedge plunger
3
15
Set screw
1
3
Master jaw
3
16
Set screw
2 or 4
4
Soft jaw
3
17
Socket head cap screw
3
5
T nut
3
18
Steel ball
1
6
Plunger
1
19
Grease nipple
6
7
Plunger nut
1
20
Hex key
1
8
Draw nut
1
21
Hex key
1
9
Cover
1
22
Hex key
1
10
Coil spring
1
23
Hex key
1
11
Handle
1
24
Felt
6
12
Socket head button screw
3
25
Back plate
1
13
Jaw attaching bolt
6
26
Socket head cap screw
3
25, 26 are only supplied if there is a back plate.

8
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.
・The chuck may start rotation
suddenly, and a part of the body or
clothing may be caught.
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)
During spindle rotation, do not turn off hydraulic pump power supply and
do not operate switching valve.
・Cutting off hydraulic pressure
causes a drop in the gripping
force which could result in the
work being released and flying
out.
・Operating the manual switching
valve or solenoid valve will lead
to a drop of hydraulic pressure.
！
For All Users
For All Users
For All Users

9
Important Safety Precautions
DANGER
Failure to follow the safety precautions below will result in
serious injury or death.
Do not allow the rotation speed of the chuck to exceed the maximum
allowable speed limit. (Refer to pages 17-22)
・If the rotation speed of the chuck
exceeds the rotation speed limit,
this is very dangerous as the
chuck and work 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 17-22)
・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 the
chuck, does not exceed.
・Excessive input force can lead to
breakage of the chuck, which is very
dangerous, as the chuck can work can
be damaged and fly out.
If you use the chuck with the inside diameter gripping, input force
(hydraulic pressure) must be 1/2 or less of the allowable maximum input.
(Refer to page 22)
・The chuck may break and
the chuck or work could fly
out.
！
For All Users
For All Users
For All Users