Kitamura 2X Spindle Failure



CHALLENGE

Possible cause of failure: Spindle sent in with broken orientation ring & screws broken off in low speed gear. Grippers had been removed. Customer supplied new orientation ring, nut & locking washer. Drive keys & grippers have significant wear. Spindle bearings were noisy incoming, test run indicated excessive noise & vibration. Front housing ID is oversized +11/+14µ (ISO is ±7.5µ) BT-40 tooling taper has some wear and 4-6µ runout.

SOLUTION

Repair action: Clean, inspect overall dimensions. Remove sheared off screws in low speed gear. Grind, chrome plate & finish grind the front housing ID. Kiss grind BT-40 tooling taper. Replace bearings, grippers, drive dogs, o-rings & assembly screws. Adjust preload, balance, assemble and break in. Final quality control inspection.

DETAILED CAUSE OF FAILURE

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