Kitagawa HW-08 Instruction Manual Download

Page: 11 / 32

Important Safety Precautions

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

DANGER

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.

In the case of processing a significant unbalanced work,
lower the rotation speed.

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.

・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.

・Unbalanced work generates dangerous centri-

fugal forces and the work could fly out.

・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.

・If the torque is insufficient or excessive,

the bolt will break, which is dangerous as
the chuck or work will fly out.

・Fix the lathe 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 tor-
que control.

・Tightening torque is moment of force when you tighten a bolt.
Tightening torque= F×L.

Tightening torque Ｔ= Ｆ×Ｌ

= 127×0.1

= 12.7(N・m)

Ｌ= 0.1 (m)

Ｆ= 127 (N)

(13 kgf)

Specified torque for socket head cap screw

Bolt size

Tightening torque

M5
M6
M8

M10

7.5 N・m

13 N・m
33 N・m
73 N・m

Bolt size

Tightening torque

M12
M14
M16
M20

107 N・m
171 N・m
250 N・m
402 N・m

Chuck

Work

Fly out

Cylinder

Draw pipe

Unbalanced work

Fly out

For All Users

The draw-bar and draw-pipe must have enough strength.
(Refer to pages 25-26)
The draw-bar and draw-pipe must have enough screw-in depth.
The draw-bar and draw-pipe must be tightened surely.

・If the draw-bar or draw-pipe is broken, a gripping force is lost instantaneously, causing the

workpiece to fly out.

・If the draw-bar or draw-pipe is screwed in inadequately, the screw is broken and a gripping

force is lost instantaneously, causing the workpiece to fly out.

・If the draw-bar or draw-pipe screw is meshed loosely, the vibration occurs or the screw is

broken. If the screw is broken, a gripping force is lost instantaneously, causing the workpiece to
fly out.

・If the draw-bar or draw-pipe is unbalanced, the vibration occurs and the screw is broken, and

then a gripping force is lost instantaneously, causing the workpiece to fly out.

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.

・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.

Gripping

Loosening

The gripping position

must be retained.

Solenoid valve

Cylinder

Lightening

＝Blackout