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 MoreWhitnon 642-0009-090 Spindle Repair
This Whitnon 642-0009-090 spindle is grease lubricated and stator driven making it capable of running up to 7,200 RPM.
CHALLENGE
This Whitnon 642-0009-090 spindle was seized when it arrived at Northland Tool. The field failed incoming testing on our motor analyzer with shorts to ground and a weak leg. After completing a disassembly and evaluation we found a couple of issues to be addressed. First the interior of the spindle had fluid inside it and this fluid had compromised the grease in all of the bearings.
Lastly, the OD taper had some runout that will need to be corrected. No other dimensional deviations were noted for this repair.
SOLUTION
The following actions were performed on this Whitnon 642-0009-090 spindle:
- Clean, inspect overall dimensions
- Replace bearings, bolts, and o-rings
- Rewind the field
- Kiss grind the OD taper
RESULT
After reassembly of all components and adjusting bearing preload, we put the spindle through a rigorous break-in and testing procedure to make sure it passes our final quality inspection. See below for the passing test reports:
Front Bearings Vibration Analysis Spectrum: Rear Bearings Vibration Analysis Spectrum:
Motor Analyzer Summary:
This spindle passed our final quality inspection and was 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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