The Bridgeport Torq-Cut 22 is a smaller CNC vertical machining center. It comes fitted with a grease lubricated and belt driven spindle capable of running up to 7,500 rpm.
Read MoreStarrag SX-051 Spindle Repair
This Starrag SX-051 spindle is grease lubricated and capable of running up to 13,000 rpm.
CHALLENGE
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.
SOLUTION
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
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 with a 1-year warranty.
DETAILED CAUSE OF FAILURE
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More Case Studies
Repair History - Here are examples of similar spindle repairs that may contain additional information that will help you. If you have additional questions, please contact us.
It’s a fact of machining — eventually, even top-of-the-line turning machines will experience a spindle failure. Spindles endure tension, torsion, heavy loads, and speeds up to and beyond 150,000 RPM, to name a few of the standard stressors.
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