Acer VMC 2040 Spindle Repair

Acer VMC 2040 Spindle Repair



CHALLENGE

When this Acer VMC 2040 spindle arrived at Northland Tool and Electronics the shaft and bearings were removed from the housing incoming.  Upon disassembling the spindle we found that the #4 bearing cage was broken and inner race was heat welded to shaft.  The #3 bearing failed from debris when #4 failed. Lastly the #5 tail bearing balls and cage were missing incoming, it appears it had catastrophically failed.  We measured the drawbar force on the incoming spindle and it was low at 1515lbs.  The gripper fingers were showing significant wear and the drive dogs were very worn.  We measured the critical dimensions (bearing journals, bearing shoulders, taper, etc.) and found that the shaft taper had 8-10 microns runout.  We also noted that the rear housing had scoring and would need to be addressed.

 

SOLUTION

The following actions were performed on this Acer VMC 2040 spindle:

  • Clean all parts of the spindle
  • Replace all bolts, o-rings, bellevilles, and wave springs
  • Replace bearings
  • Repair the drive dogs
  • Grind, chrome plate, and finish grind the rear housing.
  • Kiss grind ID tooling Taper

 

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 a week early with a 1-year warranty.

DETAILED CAUSE OF FAILURE

  • Scored rear housing repaired with a grind plate grind

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