33
06.
Trouble shooting
If the chuck malfunctions, stop the lather and try the
following countermeasures.
Trouble Cause Action
Chuck does not operate
The inside of the chuck is broken. Disassemble and replace part.
Slide way seizes.
Disassemble and repair damaged part with oil-
stone or replace it.
Rotating hydraulic cylinder does not work.
Check that pressure reduction valve, change over
valve and horse system are correct.
Insucient master jaw stroke
Chips are deposited in the chuck in large amount. Disassemble and clean.
Drawbar is loose. Remove and retighten it.
Workpiece slippage
Insucient master jaw stroke.
Position master jaw so that it is in stroke center
when workpiece is gripped.
Seizure occured. Because of doing not to grease. Grease chuck and operate it for 5 to 10 minutes.
Poor accuracy
Insucient clamping force. Check that hydraulic pressure adequately set.
Formed dia. of top jaw does not match workpiece
dia.
Reform top jaw according to correct method.
Cutting force is too high.
Calculate cutting force and reduce it up to chuck
specications.
Speed is too high.
Reduce speed up to necessary gripping force.
Secure alignment to eliminate whirling.
Periphery of chuck is run out. Tighten chuck bolts correctly.
Foreign matter is caught in serrations between
master and top jaws. Top jaw mounting bolts are
inadequately tightened.
Remove top jaw and clean serrations thoroughly.
Tighten bolts to correct torque.
Forming of top jaw is inadequate.
Check that forming plug is parallel to chuck end
face and plug is not deformed due to gripping
force.Also, check hydraulic pressure while forming
and face roughness.
Top jaw is deformed and top jaw bolts are extend-
ed because top jaw is too high.
Reduce height of top jaw by replacing with stan-
dard size jaw.
Workpiece is deformed by too much gripping
force.
Reduce gripping force to prevent deformation.
To Next Page
Loading...
