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 MoreBryant HM1050 Spindle Repair
CHALLENGE
Our customer sent in this Bryant HM1050 spindle for evaluation. During the disassembly, we noted that the stator had burnt windings and the rear bearing inner race was spalled. The rear housing ID was also grooved from ball cage ball fretting and the lower edge of the phenolic ball cage was burnt around the lower third (from stator burn) and cracked in two places. We then performed a dimensional evaluation and noted that the shaft tooling pilot ID was oversized +.0005/.0009” (spec is +/-.0001). No other dimensional deviations were noted for this repair.
SOLUTION
The following actions were performed on this Bryant HM1050 spindle:
- Clean, inspect overall dimensions.
- Rewind stator. Manufacture new ball cage.
- Grind, chrome plate, and finish grind (GPG) the tooling pilot and both bearing journals
- GPG the rear housing ID
- Replace ceramic bearings 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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