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5. Troubleshooting
When there are any troubles with the operation of the chuck, the following causes are likely.
Please check these before contacting us for service.
Trouble
Possible cause
Recommended remedy
Damaged parts on chuck.
Disassemble and repair.
Seizure of sliding contact part.
Disassemble and repair with oilstone or
replace.
Chuck does
not operate
Rotating cylinder inoperative.
Check the piping line. If no problem is
detected, disassemble and clean the
cylinder.
Chips heavily accumulated inside.
Disassemble and clean.
Insufficient
master jaws
stroke.
Loosened joint between rotating
cylinder and connecting pipe.
Remove the rotating cylinder and
retighten.
Insufficient top jaws stroke.
Adjust so that top jaws come near the
center of the stroke when they grip the
work piece.
Insufficient pressure.
Increase pressure to the set level.
Top jaws do not match the work
piece diameter.
Correct top jaws forming in right way.
Excessive cutting force.
Calculate the cutting force to see if it
matches the specification of chuck.
Insufficient lubrication at master
jaws and sliding parts.
Supply grease from grease nipples and
open/close the top jaws a few times while
no work piece is gripped.
Work piece
slips.
Excessive speed of revolutions.
Reduce the speed till the necessary
gripping force is assured.
Chuck runs out.
Check peripheral and end face run-out
and retighten bolts.
Stopper end face runs out.
Correct the run-out stopper end face.
Dust has entered the master jaws
or serration of top jaws.
Remove top jaws, clean serration part
thoroughly to remove dust.
Jaws fastening bolts are not
tightened securely.
Fasten bolts sufficiently (but not too
much).
Jaws are not formed properly.
Confirm if the forming plug or the forming
ring is in parallel with chuck's end face
and if the forming plug or the forming ring
is not deformed by gripping force.
Also check forming pressure and jaws
surface roughness.
Jaws are deformed or jaws
fastening bolts are extended due
to excessive jaws height.
Lower the height of jaws as much as
possible. Excessive jaws height may
reduce the service life of the chuck.
Deformation is caused at specific
portion of jaws because a very
heavy work piece is held by jaws
only.
Try to grip the work piece at around the
centerline to avoid eccentric distribution
of load to any specific jaws.
Poor
accuracy.
Work piece is deformed due to
excessive gripping force.
Reduce
the
gripping
force
to
a
reasonable amount to assure proper
machining.
Summary of Contents for H3KB
Page 4: ...2 M5 M M8 M10 M12 M16 M20 N m 7 1 12 1 29 4 57 9 101 161 251...
Page 5: ...3 8 1 4 1 EP...
Page 11: ...9 3 1 3 1 3 1 3 1 3 3 3 3 H 8...
Page 13: ...11 11 D D d d D d 0 75 D D d d D d 0 75 D D d d H7 1 6a d d h6 1 6a...
Page 19: ...17 4 3 4 3 4 3 4 3 ANSI B11 6 1984 section 7 1 9...
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