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.
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GMN HV X120 30000-18 Spindle Repair
The GMN HV X120 30000-18 is an oil mist lubricated and stator driven spindle capable of running up to 30,000 rpm.
CHALLENGE
Our customer sent this GMN HV X120 30000-18 spindle in because they were experiencing excessive chatter. When it arrived at Northland Tool and Electronics we noted that the bearings were noisy when spun by hand. After disassembly we noted that the #1 front bearing feels rough when rotated. We then measured the critical dimensions (bearing journals, housing, etc.) and we found a few deviations. First, the front bearing housing was oversized and egged 0/+10µ (ISO is +/-7.5µ). Second, the front shaft journal was oversized +9/+10µ (ISO is +/-4µ), but appears to be manufactured to that dimension. Lastly, the rear housing was undersized -10/-11µ (ISO is +/-6.5µ), but appears to be manufactured to that dimension. We also noted that the tach sensor function tested good and one set of thermistor wires was disconnected.
SOLUTION
The following actions were performed on this GMN HV X120 30000-18 spindle:
- Clean all parts of the spindle
- Replace all bolts and o-rings
- Replace ceramic bearings
- Grind, plate, and finish grind the front bearing housing
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.
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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.
OD grinding — or outside diameter grinding — is a cornerstone of precision manufacturing, where exact specifications and flawless surface finishes are essential.
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