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
HSD ES988A Spindle Repair
The HSD ES988A spindle is grease lubricated, stator driven, and capable of operating up to 24,000 rpm.
This HSD ES988A spindle bearings were noisy when rotated by hand in assembly incoming and rust built up on the shaft nose was preventing ejection of the tool. Upon disassembling and evaluating the spindle, we noted that the rear bearings were full of particulate and the OD of the outer races was fretted. The motor also contained excessive particulate buildup. We then measured the critical dimensions (bearing journals, housing, taper, etc.) and found a few issues. First, the HSK face had high runout of >5µm and the taper had 2µm runout. Second, the 45mm front bearing journal was undersized -20µm (ISO = ±3.5µm). Lastly, the front shoulder had high runout. No other dimensional deviations were noted for this repair.
The following actions were performed on this HSD ES988A spindle:
- Clean, inspect overall dimensions.
- Grind, chrome plate, and finish grind the 45mm front bearing journal
- Kiss grind the front journal shoulder
- Kiss grind the HSK face and taper to address the high runout
- Replace all ceramic bearings, o-rings, and assembly screws
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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Running this spindle too long caused deformed ball bearings and damage to the outer race Damage to the outer race is consistent with prolonged operation after spindle exhibited initial signs of needing to be rebuilt Every spindle rebuilt by North…Read More