Catastrophic bearing failure was the main cause of this spindle malfunction Continue reading to learn how Northland Tool performed this repair and converted a Weiss GHK 176239 spindle from grease-injected to permanent grease lubrication……Read More
Whitnon 311-2143-030 Spindle Repair
This Whitnon 311-2143-030 spindle is out of a Cincinnati R-55 cylindrical grinder. It is an oil mist lubricated and pulley driven spindle capable of running up to 20,000 RPM.
Our customer sent in this Whitnon 311-2143-030 spindle stating that the spindle was noisy. When it arrived at Northland Tool, we noted that the exterior was corroded and it appeared to have been repaired previously.
The spindle did rotate freely, but the bearings felt worn when spun by hand. After completing a full breakdown and evaluation, we recorded that the front #1 bearing cage was destroyed and contaminated the #2 bearing.
We then performed a full dimensional evaluation and found that the ID tooling taper had high run out and the front bearing housing was severely tapered.
The following actions were performed on this Whitnon 311-2143-030 spindle:
- Clean, inspect overall dimensions
- Replace bearings, bolts, and o-rings
- Grind, plate, grind (GPG) the ID taper
- GPG the front bearing housing
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.
This spindle passed our final quality inspection and was returned to our customer with a 1-year warranty.
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