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 SH5000 Spindle Repair
The Mori Seiki SH5000 is a very large CNC horizontal machining center. It can come fitted with this oil mist lubricated and stator driven spindle capable of running up to 12,000 rpm.
CHALLENGE
Our customer sent in this Mori Seiki SH5000 spindle stating that it had failed. The spindle arrived at Northland Tool and Electronics as just a shaft and bearings with no housing. We noted that there was contamination visible in the bearings incoming. After disassembling and evaluating the spindle, we noted that both of the front bearings felt very poor when spun by hand. The rear bearing had separated and we only received the inner race. The drawbar was severely contaminated and was difficult to disassemble due to rust, however the grippers were in good condition. Lastly, the ID taper had uneven contact and was in poor visible condition. No other dimensional deviations were noted for this repair.
SOLUTION
The following actions were performed on this Mori Seiki SH5000 spindle:
- Clean, inspect overall dimensions
- Replace bearings, o-rings, and bellevilles
- Kiss grind 40 ID taper
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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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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