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 MoreBridgeport VMC1000XP3 Spindle Repair
The Bridgeport VMC1000XP3 is a large CNC vertical machining center. It comes fitted with a grease lubricated and belt driven spindle capable of running up to 12,000 rpm.
CHALLENGE
This Bridgeport VMC1000XP3 spindle had been completely disassembled prior to arrival at Northland Tool and Electronics. The grippers were not provided and most of the bellevilles were crushed. The drive keys were extremely worn as well. Upon further inspection, we found that the rear roller bearing failed and the spacer spun on the journal. We then measured the critical dimensions and found a few issues to be addressed. First, the rear roller journal and front journal shoulder had high runout. Second, the Big-Plus tooling taper ID had poor tool contact with high runout and the chrome is chipped at the taper mouth. Lastly, the 110mm front housing was out of round +7/+17µm and the 100mm rear housing was oversized out of ISO.
SOLUTION
The following actions were performed on this Bridgeport VMC1000XP3 spindle:
- Clean, inspect overall dimensions
- Manufacture and install new drive keys
- Grind, chrome plate, and finish grind (GPG) the Big-Plus tooling taper ID
- GPG the 110mm front housing and 100mm rear housing
- Kiss grind the rear roller journal and the front journal shoulder
- Replace all bearings, bellevilles, grippers, seals, 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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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.
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