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
Starrag SX-051 Spindle Repair
This Starrag SX-051 spindle is grease lubricated and capable of running up to 13,000 rpm.
This Starrag SX-051 spindle suffered a catastrophic failure of #3 and #4 bearings. The housing was fretted and grooved. We also measured 6 microns runout on the taper and 110 microns runout on the drawbar flute. The thermistor and gripper fingers will need to be replaced. Lastly, the rear of the spindle was coated with dried coolant, most likely due to rotary union leaking.
The following actions were performed on this Starrag SX-051 spindle:
- Clean, inspect overall dimensions
- Replace bearings, grippers, thermistor, and rotary union
- Grind chrome plate and finish grind (GPG) the housing
- GPG the HSK taper
- GPG the drawbar flute
- Kiss grind face
- Manufacturer a new 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.
DETAILED CAUSE OF FAILURE
#3 bearing that failed. The cage that separates the rolling elements has disintegrated from lack of lubrication. This causes the rolling elements to "stack up" on each other causing the shaft to stop rotating smoothly.
Here is a view of the interior of the spindle rear. The rotary union had failed leaking coolant into the spindle causing the failure of the bearings.
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