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
Enshu EV530S Spindle Repair
The Enshu EV530S is a high speed CNC vertical machining center. It can come fitted with this oil mist lubricated and stator driven spindle capable of running up to 14,000 rpm.
This Enshu EV530S spindle spun good by hand, but had some bearing noise and high runout on the taper ID incoming. We noted that there was some cosmetic damage on the front cover incoming, possibly from a “crash”? All the electrical systems passed bench testing, but the encoder appeared to be damaged internally. There was no read out across all phases when the encoder was tested. We also measured high run out on the encoder wheel. Pull force was on the low side and the gripper fingers were very worn down. After completing a full breakdown and evaluation, we noted that there was heavy contamination of an oily black particulate found through out all 4 front bearings. We then measured the shaft and found it had a 40 micron bend in it where the rotor sits when measured bareshaft. We took the bend out and brought it back in @3/4microns to continue measuring the bare shaft. Slightly high run out on the taper ID remained. The middle spacer had spun out on the shaft leaving some fretting on the shaft OD and inner spacer ID. Lastly, the front of the shaft rubbed out on the front cover causing some raised material. No other dimensional deviations were noted for this repair.
The following actions were performed on this Enshu EV530S spindle:
- Clean, inspect overall dimensions
- Replace bolts, o-rings, gripper fingers, encoder sensor, and bearings
- Kiss grind the ID taper
- Clean up rub out damage on front shaft OD and front cover ID
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