Milltronics VM17 Spindle Repair

Milltronics VM17 Spindle Repair

This is a spindle made by Setco for a Milltronics machine.  The spindle is grease lubricated, belt driven, and capable of running up to 8,000 rpm.


This Milltronics VM17 spindle was sent in for a full breakdown and evaluation.  Upon inspection, we noted that the #3 bearing of the front tri-set failed. The manufacturer or the previous rebuilder did not set the spacers correctly for the front bearing set. They had the spacers set for a much heavier preload than the speed of the spindle would allow. This caused heat and premature bearing wear that eventually lead to the failure of the spindle assembly. The taper also had 8 microns of run out.



The following actions were performed on this Milltronics VM17 spindle:

  • Clean all parts of the spindle
  • Replace bearings, o-rings, and assembly screws
  • Rework the bearing spacers
  • Kiss grind the taper



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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