Mori Seiki NH4000 Spindle Repair

Possible cause of failure:
Shaft taper is worn, tooling rocks in the taper.
Drawbar force is 1420lbs incoming (low for a Big Plus taper), likely from being taper ground.
Taper coolant plungers are worn out.
Gripper fingers are worn.
#1 front bearing is bad, probably from a crash.
Customer supplied a standard tool, but shaft is set as BIG PLUS.
Front cover has a couple of cosmetic marks on the face

Repair action:
Clean, inspect overall dimensions.
Grind, chrome plate and finish grind the taper to BIG PLUS spec.
Replace bearings, o-rings, bellevilles, taper coolant plunger assemblies and grippers
Adjust preload, balance, assemble and break in. Final quality control inspection.



DETAILED CAUSE OF FAILURE

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