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 MoreMazak VTC-20B Spindle Repair
The Mazak VTC-20B is a CNC vertical machining center. It comes equipped with a grease lubricated and coupling driven spindle capable of running up to 8,000 rpm.
CHALLENGE
Our customer, a leading manufacturer of multi-spindle screw machines, uses many other CNC machine tools to manufacture their products. The bearings in this spindle from a vertical machining center were very noisy when rotated by hand in assembly incoming. Upon disassembly, we observed that the grease in the bearings was severely degraded and full of black particulate. We also noted that the tooling taper ID and the tool retention gripper fingers were in poor condition. No other dimensional deviations were noted.
SOLUTION
The following actions were performed on this Mazak VTC-20B spindle:
- Clean all parts of the spindle
- Replace all bolts, o-rings, and bellevilles
- Replace gripper fingers
- Replace bearings
- Kiss grind ID tooling 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.
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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