Kitagawa YW Series, Instruction Manual, Page: 11 / 28

9 10
Always tighten the bolts at the specified torque. (Refer to page 23)
・If the torque is insufficient or ex-
cessive, the bolt will break, which
is dangerous as the cylinder or
work will fly out.
・Fix the lathe spindle or the cylin-
der when you tighten bolts. Your
hand could slip and get injury
when you work without fixing the
spindle.
・You must use a torque wrench for
torque control.
※Since the material of the cylinder is aluminum, it is 80% of the tightening torque to
the bolt size specified for the hydraulic chuck of our company.
Tightening torque is moment of force when you tighten a bolt.
Tightening torque= F×L.
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 and work flying out.
・Check that the chuck and the cylinder are in the safe combination when using at high pressure
with our company or the distributor. Especially when the cylinder of our company and a high
pressure chuck of other company are combined, confirmation is necessary.
・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 gripping force does not rise
even if hydraulic pressure is raised.
・If the hydraulic pressure suddenly drops
due to blackout or malfunction of the
hydraulic pump, etc., this is dangerous as
work will fly out.
・Lock valve retains the hydraulic pressure
inside the cylinder temporarily, when the
hydraulic pressure suddenly drops due to
blackout or malfunction of the hydraulic
pump, etc.
Use a cylinder with a lock valve (safety valve, check valve) incorporated in case of
sudden hydraulic pressure drop due to blackout, malfunction of the hydraulic pump,
etc. Further, use a solenoid valve with a circuit that retains
the gripping position when no current is carried.
Back plate
Socket head
cap screw
Tightening torque
Ｔ= Ｆ×Ｌ
= 127×0.1
= 12.7(N・m)
Ｌ=
0.1 (m)
Ｆ= 127 (N)
(13 kgf)
Chuck
Work
Fly out
Cylinder
Draw pipe
Important Safety Precautions
Specified torque for socket head cap screw
Bolt size
Tightening torque
M6
M10
M12
M16
10 N・m
58 N・m
85 N・m
200 N・m
Gripping Loosening
The gripping position must be retained.
Solenoid
valve
P
Cylinder
Lightening
＝Blackout
Lock valve
For Machine Tool Manufactures
Failure to follow the safety precautions below will result in
serious injury or death.
DANGER
Failure to follow the safety precautions below will result in
serious injury or death.
DANGER
For All Users For All Users