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
Gamfior HNA75 Spindle Repair
The Gamfior HNA75 is an ID grinding spindle. It is oil mist lubricated, stator driven, and capable of running up to 75,000 rpm.
This Gamfior HNA75 spindle arrived at Northland Tool and Electronics for a full breakdown and evaluation. Upon inspection, we noted that there was a catastrophic failure of the #1 and #3 bearings. The front drain was blocked with grinding debris and there was a lot of oil internally. It appears that the bearings failed from over lubrication. Lastly, the front shaft nut rubbed out slightly with the front cover and the pilot face had slight damage with 20 microns of runout.
The following actions were performed on this Gamfior HNA75 spindle:
- Replace bearings, o-rings, and assembly screws
- Kiss grind the pilot face
- Recommend checking the front drain of spindles for blockage during operation. This may have caused the over lubrication failure by not draining the oil from the spindle
- Recommend checking the lubrication system for proper oil volume
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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