Hardinge Quest 42 Spindle Repair

Over time coolant found its way through the front of the spindle and contaminated the bearings. Eventually this breaks down the bearing grease and causes bearing failure.

Possible cause of failure:
Front bearing failure from contamination, some in the rear as well.
Drive pulley ID has some pre-existing score marks, likely from installation or removal.
Chuck alignment pin has wear on one side.

Repair action:
Clean, inspect overall dimensions.
Replace bearings, front cover gasket, chuck alignment pin.
Kiss grind drive pulley ID to remove high spots (some visible lines will remain, but will not affect function.)
Adjust preload, balance, assemble and break in. Final quality control inspection.



DETAILED CAUSE OF FAILURE

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