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 MorePace Maker 4J02808028 Spindle Repair
This spindle has a Pacemaker motor manufactured by Louis-Allis and a cartridge spindle manufactured by Brown & Sharp. The Brown & Sharp spindle is grease lubricated and capable of running up to 3,300 rpm.
CHALLENGE
This Pace Maker 4J02808028 motorized spindle was sent to us for repair. Incoming tests showed that the bearings felt rough when spun by hand and when test run were very loud. Upon disassembly we found the bearings were slightly contaminated and would need to be replaced. After the spindle was fully apart we measured the critical dimensions (bearing journals, bearing shoulders, tapers, etc.) and found that the spindle OD taper run out was >6 microns.
SOLUTION
The following actions were performed on this Pace Maker 4J02808028 spindle:
- Clean all parts of the spindle
- Replace all bolts and o-rings
- Replace bearings
- Kiss grind OD 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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