Mazak QT 28 Spindle Repair

Possible cause of failure:
Bearing failure from several years of operation and contamination.
Rear bearing shows sign’s of excessive belt tension, outer race has severe wear on one side.
Lathe taper appears to be worn.
Front roller spacer has a plastic shim to adjust bearing preload.
OD of the front pair bearing is purple.

Recommended action:
Clean, inspect overall dimensions.
Kiss lathe taper and face for proper contact.
Replace bearing’s,o-rings,screw’s,bolt’s .
Manufacture a new front roller spacer out of metal.
Adjust preload, balance, assemble and break in. Final quality control inspection.



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