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 MoreHwacheon Lathe Spindle Repair
CHALLENGE
Our customer sent this turning center spindle in for rebuild because of poor part finish and excessive bearing noise. The front tapered roller bearing failed from contamination with coolant, which had washed out almost all of the grease and allowed corrosion of the rolling elements and raceways. The contaminant had also largely displaced the grease in the rest of the bearing complement, including the rear tapered roller. Our dimensional inspection also showed slight damage on the tooling taper OD and face. We did notice that both the front and rear housing IDs were on the loose side of ISO, but there was no fretting which would indicate that this condition contributed to the bearing failure. As the housing bores were likely manufactured this way, we did not recommend grind, plate & finish grind to tighten them up.
SOLUTION
The following actions were performed on this Hwacheon Lathe spindle:
- Clean all parts of the spindle
- Replace all bolts and o-rings
- Replace bearings
- Kiss grind taper OD and face
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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