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 6/42 Spindle Repair
The Hardinge Quest 6/42 is a CNC turning center made for high production lathe work. It comes equipped with a stator driven and grease lubricated spindle capable of running up to 5,000 rpm.
When this Hardinge Quest 6/42 spindle arrived at Northland Tool and Electronics, we performed a quick incoming test run to 3000 rpm. We noted from this that the bearings were noisy and the spindle had high balance. Upon disassembly, we found that the front bearing triset and rear pair were contaminated with coolant. The grease had been degraded throughout and were rough when spun by hand. We also noted that the inside of the front cover and other interior surfaces of the spindle had coolant residue and some corrosion. No dimensional deviations were found in the spindle.
The following actions were performed on this Hardinge Quest 6/42 spindle:
- Clean, inspect overall dimensions.
- Drill and tap for an air purge fitting in front cover to help mitigate coolant contamination.
- Upgrade to sealed bearings,
- Replace front cover gasket, rear lip seal, and 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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