Mazak QTN-100-11 Spindle Repair

This Mazak QTN-100-11 machine was a demo model that our customer bought. It ran well for years but started to have spindle noise at higher speeds. Eventually the noise prohibited running the spindle at high speed so they used it at lower rpms to get through the backlog of work they had. We worked closely with our customer to schedule a machine tool repairman to remove the spindle, get it repaired and reinstalled in as little time as possible. The entire process was accomplished without any issues and our customer had their Mazak running sooner than they expected.

Possible cause of failure:

Rear bearing failure from coolant contamination, coolant washed out the grease and started to contaminate the grease in the #3 bearing.
Sensor ring has a damaged tooth.
Orings, socket screws and shrink tubing are worn.

Recommended action:
Clean, inspect overall dimensions.
Replace bearings.
Repair the sensor ring.
Replace the orings, socket screws and shrink tubing.
Adjust preload, balance, assemble and break in. Final quality control inspection.


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