Mitsubishi M-V5CN Spindle Crashed


Cause of failure: Front quad set of ceramic bearings feel rough when rotated by hand, possibly from a sudden excessive radial load. Shaft tooling taper is worn with poor tool contact. Shaft tail ID is severely scored & the end of the OD is oversized >70µ from the rest of the journal with 8-14µ runout. Hydraulic rotor journal has pre-existing light scoring.


Recommended action: Clean, inspect overall dimensions. Polish out scoring on rotor journal. Kiss grind shaft tooling taper. Grind, chrome plate & finish grind rear shaft journal OD & ID. Replace bearings (this quote includes high speed tail bearing), o-rings & assembly screws. Adjust preload, assemble and break in. Final quality control inspection.

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