Mori Seiki CL 20A

Possible cause of failure:
Nose of shaft is bent, excessive run out.
Face has 40µ runout,taper has 40µ runout,front shoulder has 22µ run out.
Front taper is 10µ egged,thrust bearing journal has 7-8µ run out.
Front bearings are slightly contaminated.
Spindle was crashed
Pulley compression ring is damaged.

Repair action:
Clean, inspect overall dimensions.
Replace bearings.
Kiss grind the face, taper, front shoulder to straighten shaft.
Replace pulley compression ring.
Replace orings.
Adjust preload, balance, assemble and break in. Final quality control inspection.

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