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
Mighty Viper VMC-1300A Spindle Repair
The Mighty Viper VMC-1300A is a CNC vertical machining center. It comes equipped with this grease lubricated and gear driven spindle capable of running up to 6,000 rpm.
Our customer sent in this Mighty Viper VMC-1300A spindle stating the taper and bearings were bad. A visual inspection of the taper confirmed this and spinning the shaft by hand confirmed the bearings were bad (could hear clunking from bearings). Incoming assembled runout of the taper was 8 microns and incoming assembled runout of the tail was 20 microns. After completing the disassembly, we noted that bearings #3 and #4 had light contamination from a black particulate. Bearings #1 and #2 were heavily contaminated with the same black particulate. The ball cage on the #3 bearing was cracked and had chipped into the grease of the bearing. We then evaluated all the critical surfaces of the spindle and found a couple unacceptable deviations. First, the 50 taper ID had a bareshaft reading of 14 microns. Second, the front shoulder had a runout of 6 microns and the rear shoulder had a runout of 8 microns. Lastly, we noted that the front drawbar spacer was shattered and the grippers were in poor condition.
The following actions were performed on this Mighty Viper VMC-1300A spindle:
- Clean, inspect overall dimensions
- Replace bolts, o-rings, bellevilles, grippers, and bearings
- Grind, chrome plate, and finish grind the shaft 50 taper ID
- Kiss grind shaft front and rear shoulders
- Machine new drawbar belleville spacer
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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