Catastrophic bearing failure was the main cause of this spindle malfunction Continue reading to learn how Northland Tool performed this repair and converted a Weiss GHK 176239 spindle from grease-injected to permanent grease lubrication……Read More
Hardinge Quest 8/51 Spindle Repair
The Hardinge Quest 8/51 is a high production CNC turning center. It comes equipped with a grease lubricated and belt driven spindle capable of running up to 6,000 rpm.
This Hardinge Quest 8/51 spindle arrived at Northland Tool and Electronics covered in sticky coolant residue mixed with turnings. Coolant & swarf had completely degraded the grease in the front tri-set of angular contact bearings and the rear roller bearing. At some point the rear bearing failed completely as evidenced by the broken cage. Our inspection showed damage to the vibration damping mounts, front slinger cover and pulley retention nut. In addition, the pulley was fused to the shaft, but we were able to save the pulley by heating it while chilling the shaft to separate the two components without doing further damage. While we found excessive wear to both the ID & OD tapers, our comprehensive dimensional evaluation revealed no significant deviations on the shaft journals or in the housing bores.
The following actions were performed on this Hardinge Quest 8/51 spindle:
- Clean all parts of the spindle
- Replace all bolts and o-rings
- Replace front cover gasket and vibration damping mounts
- Replace bearings
- Repair damage to the front slinger cover and pulley retention nut
- Kiss grind the shaft ID and OD tapers and face
After reassembly of all components, adjusting bearing preload, and undergoing break-in and testing procedures, this spindle passed our final quality inspection before being returned to our customer with a 1-year warranty.
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