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
GMN TSSV120 Spindle Repair
The GMN TSSV-120 is a high speed grinding spindle with its own built in motor. It is oil mist lubricated and capable of running up to 42,000 rpm.
When this GMN TSSV120 spindle arrived at Northland Tool and Electronics we first noted that it had axial end play, indicating a loss of bearing preload. The shaft tooling pilot had very high runout (>36µ) and the pilot face was chipped. Our internal evaluation showed contamination with grinding swarf. Also, the rear ID of the main housing, where the ball cage locates, was egged and oversized with dings from the balls because the slide fit was too loose.
The following actions were performed on this GMN TSSV120 spindle:
- Clean all parts of the spindle
- Replace all bolts and o-rings
- Replace ceramic bearings
- Grind-chrome plate-finish grind (GPG) the shaft tooling pilot
- GPG the rear housing ID
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.
DETAILED CAUSE OF FAILURE
GMN spindle disassembled and ready for cause of failure evaluation.
This stator is encased in resin to help protect it from contamination causing electrical issues.
The ball cage assembly being removed from the rear of the spindle. The ball cage allows axial movement of the shaft caused by heat growth. Without the ball cage the shaft would heat up from normal use, expand and over preload the bearings causing spindle failure.
This is the chip in the front tooling face found during evaluation.
Clogged coolant jacket. We remove all coolant jackets from the main housings and this is a great example of why we do it. No coolant was able to circulate around the stator. The heat generated from the stator will no longer be carried away and will eventually cause the stator windings to deteriorate.
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In this helpful guide to spindle bearing preload, Northland Tool & Electronics will answer all the basic questions about your spindle bearing preload calculations.Read More