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
Kiwa 45G Spindle Repair
The Kiwa KH-45G is a 4-axis CNC horizontal machining center. It comes standard with an oil mist lubricated and belt driven spindle capable of running up to 12,000 rpm.
Our customer sent this Kiwa 45G spindle in because of poor part finish. When it arrived at Northland Tool and Electronics we noticed right away that the bearings were noisy and the Big-Plus 40 taper was bell mouthed. Because of the bell mouthed taper the tooling rocks in the taper. It also has deep pock marks and excessive runout. The drawbar shaft had scoring from bellevilles. There were no other dimensional deviations noted besides the taper.
The following actions were performed on this Kiwa 45G spindle:
- Clean, inspect overall dimensions
- Replace all bolts, o-rings, and bellevilles
- Replace bearings
- Grind, plate, finish grind(GPG) the BIG PLUS 40 taper to BIG PLUS specifications
- GPG the drawbar
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