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-20 Spindle Repair
Northland Tool repaired this Mazak VTC-20 spindle for our customer 8 years ago. It started to make some front bearing noise so our customer called us to set up a scheduled repair. With the advanced warning that the spindle was coming in and having the spindle pulled from the machine before additional damage from a failure occured made it possible to complete this repair in a few days. This enabled our long time customer to plan around the machine downtime and not miss deliveries to their customers.
CHALLENGE
Possible cause of failure:
- #1 front bearing failure from contamination
- Shaft taper was out of ISO
- Grippers were worn
SOLUTION
Recommended action:
- Clean, inspect overall dimensions
- Replace bearings, o-rings, and assembly screws
- Kiss grind the shaft taper
- Replace the gripper fingers
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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