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 MoreExcello Grinding Spindle Repair
CHALLENGE
When this spindle arrived at Northland Tool and Electronics we disassembled and evaluated it. We found that the front bearings were contaminated with grinding dust. This was found more so in the #1 bearing than the others. The wheel hub and hub retention nut show heavy wear from use (hub also loads the front bearings.) We also found that the front housing labyrinth nut was worn from grinding dust contamination. Lastly, we measured the critical dimensions (bearing journals, housing, etc.) and found that the rear bearing journals were undersized -24/-40µ (ISO is 0/-7µ) and appear to have been previously flash chromed. No other dimensional deviations were noted.
SOLUTION
The following actions were performed on this Excello Grinding spindle:
- Clean, inspect overall dimensions
- Replace all bolts and o-rings
- Replace bearings and felt seal
- Manufacture a front housing labyrinth nut
- Grind, chrome plate, and finish grind rear bearing journals
RESULT
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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