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 MoreRenaud GP-0 Spindle Repair
The Renaud GP-0 spindle is grease lubricated, stator driven, and capable of running up to 3,630 rpm.
CHALLENGE
This Renaud GP-0 spindle arrived at Northland Tool and Electronics with bearings that were very noisy when rotated by hand in assembly incoming. The stator (field) also failed electrical testing incoming. Upon closer inspection, we noted that the stator was burned out and had contaminated all of the bearings. Remaining grease in the bearings was severely degraded. The shaft face and rear bearing journal shoulder had excessive runout.
No other significant dimensional deviations were noted.
SOLUTION
The following actions were performed on this Renaud GP-0 spindle:
- Clean, inspect overall dimensions
- Rewind and reinstall the stator
- Kiss grind the shaft face and the rear bearing journal shoulder
- Replace all bearings, o-rings, and assembly screws
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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