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 MoreMori Seiki NH5000 Spindle Repair
The Mori Seiki NH5000 is a large CNC horizontal machining center. It comes fitted with an oil mist lubricated and stator driven spindle capable of running up to 12,000 rpm.
CHALLENGE
This Mori Seiki NH5000 spindle arrived at Northland Tool and Electronics for a complete breakdown and evaluation. Upon assessment, we noted that the #1 and #2 bearings had failed and the #2 bearing had spun on the shaft and in the housing. It was also noted that the shield for the oil line was snapped off. Coolant plungers and the drive dogs need to be replaced. Lastly, the inner spacer was destroyed by the bearing so we will have to remake a new one.
SOLUTION
The following actions were performed on this Mori Seiki NH5000 spindle:
- Clean, inspect overall dimensions
- Replace bearings, shield for oil lines, splash ring, plunger assembly, drive dogs, ferrules, and brass tubing
- Grind, chrome plate, and finish grind (GPG) the shaft journal and taper
- Balance the shaft after GPG
- GPG the housing
- Manufacture a new inner bearing spacer
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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