Cause/Solution |
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There are four possible causes for this problem:
- Cause: The hydraulic system is not locked.
Solution: Move the shell towards the headstock until it is in the right
position and make sure that the hydraulic screw is threaded in as far as it
goes. Activate the air bearing again-if the shell still slips, continue to the
next probable cause.
- Cause: The hydraulic system needs to be filled.
Solution: Fill the hydraulic system. See Topping up the arbor
hydraulic fluid level. Activate the air bearing again—if the shell still
slips, continue to the next probable cause.
- Cause: The arbor is faulty.
Solution: Completely release the hydraulic screw and use a micrometer to
measure the diameter of the hydraulic expanding sections of the arbor. The
results should be within 10-20 mm of the specifications given on the final grinding drawing of the arbor.
Activate the hydraulic screw to fully pressurize the hydraulic system and again measure
the diameter. Compare the results with the inside diameter of the bushings of
the shells as given in the shell bushing drawings. The measured expanded diameter should be at least 20 mm
greater than the bushing inside diameter. If the measurements are good, continue to the next probable cause.
If the measured values are not good, contact Creo support.
- Cause:The bushing bores are worn to the point that the hydraulic clamps can no longer
grip the shell.
Solution: If the measurements taken in the previous step indicate that
there is enough interference, the only option left is that the shell bores are
bad, and the shell should be replaced.
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