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 Quick Turn 28 Spindle Repair
The Mazak Quick Turn 28 is an older CNC turning center. It comes standard with a grease lubricated spindle capable of running up to 3,600 rpm.
CHALLENGE
This Mazak Quick Turn 28 spindle arrived at Northland Tool and Electronics for a full breakdown and evaluation. After inspection we noted that the bearings failed due to fatigue from use and some contamination. The rear bearing shows signs of excessive belt tension, as the outer race had severe wear on one side. We also noted that the front roller spacer had a plastic shim to set preload and the OD of the front pair of bearings was purple!! Lastly, the lathe taper was worn and would need to be addressed.
SOLUTION
The following actions were performed on this Mazak Quick Turn 28 spindle:
- Clean, inspect overall dimensions
- Kiss grind the lathe taper and face for proper contact
- Replace bearings, o-rings, and assembly screws
- Manufacture a new front roller spacer out of metal
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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