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 MoreMakino A81 Spindle Repair
A contract manufacturer was installing their Makino A81 spindle when someone hit the X travel and jammed the spindle into the housing. The spindle was not entirely in the machine so damage did occur. When the spindle was pulled from the machine they found when the shaft was spun by hand the bearings sounded rough. They called Northland Tool and requested an expedited rebuild on their milling spindle.
CHALLENGE
Once we received this Makino A81 spindle, it was determined that the bearings would need to be replaced. We also found that the shaft taper was worn and would need to be ground. Lastly, we noted that the front nut was damaged and we would have to manufacture a new shaft spacer.
SOLUTION
The following actions were performed on this Makino A81 spindle:
- Clean all parts of the spindle
- Replace all bolts and o-rings=
- Replace bearings
- Machine a new spacer and repair the front nut
- Kiss grind shaft 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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