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 MoreOkuma ES-V4020 Spindle Repair
The Okuma ES-V4020 is a CNC vertical machining center. It comes fitted with a grease lubricated and belt driven spindle capable of running up to 8,000 rpm.
CHALLENGE
This Okuma ES-V4020 arrived at our facility for a full breakdown and evaluation. Upon assessment, we found that the front bearing cage was broken. It seems to have failed from long use and contamination. We also noted that the taper had 6 microns of runout. The inner spacer had spun on the shaft, damaging the shaft journal and spacer. Lastly, the bellevilles were broken and the drawbar was worn.
SOLUTION
The following actions were performed on this Okuma ES-V4020 spindle:
- Clean, inspect overall dimensions
- Kiss grind the tooling taper
- Grind, chrome plate, and finish grind the shaft journal
- Manufacture a new bearing spacer
- Replace bearings, seals, and bellevilles
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.
DETAILED CAUSE OF FAILURE
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