Mazak QT250 Spindle Failure from coolant contamination



CHALLENGE

Failure: Bearing failure due to heavy coolant contamination. Bearing raceways micro-machined by debris from rolling elements. Pulley drive key rusted into shaft.

SOLUTION

Recommended action: Clean, inspect overall dimensions. Replace all bearings, pulley drive key, o-rings & screws. Adjust preload, balance, assemble and break in. Final quality control inspection.

DETAILED CAUSE OF FAILURE

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