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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Mori Seiki MH-50 Spindle Repair
The Mori Seiki MH-50 is a large CNC horizontal machining center. This spindle is very unique as it comes with a ceramic taper that can become an issue as the machine ages. It is oil mist lubricated and belt driven making it capable of running up to 6,000 rpm.
CHALLENGE
This Mori Seiki MH-50 spindle arrived at Northland Tool and Electronics with the ceramic taper insert is broken, with pieces missing. Due to damage, the drawbar force could not be checked. Upon disassembly, the front shaft journal where the angular contact bearings ride was fretted and undersized by -8/-10. The rear drive coupling upper and lower IDs were severely worn and over sized (spindle side and motor side). We also noted that the rear drive coupling shaft journal was severely fretted from a loose drive coupling or a loose fit between the drive coupling and drive motor. The collet fingers, drive dogs, and drawbar springs were worn. Lastly, the shaft nose OD had light rub out with the front cover.
SOLUTION
The following actions were performed on this Mori Seiki MH-50 spindle:- Clean, inspect overall dimensions
- Replace bearings and o-rings
- Remove damaged ceramic taper insert
- Manufacture a hardened steel insert
- Finish grind the insert and kiss grind the shaft OD rub out damage
- Grind, chrome plate, and finish grind (GPG) the front journal
- GPG the rear drive coupling journal
- Customer needs to check their drive motor were it attaches to the drive coupling for wear
- Weld and machine drive dogs
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.
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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