This spindle came to us as an expedited repair. It came from a machine that feeds several other departments in their facility and each hour of downtime costs them thousands of dollars. We completed this repair for them in record time even with a grind plate grind. We can accomplish this because we do all of our grinding work here in our grinding department that is set up specifically for reworking spindle parts. Most of our competitors rely on outside vendors for their grinding and that leaves them at the merci of their vendors. We have much better control of our quality and lead times.
Possible cause of failure:
Customer indicated bearing noise, excessive run out, defective proximity clamp sensor.
Drawbar actuator leaking, preventing drawbar actuation. We could not check incoming force.
Front bearings are contaminated, grease washed partially out.
HSK taper and face has 8-10 microns runout. Rear nut groove is slightly damaged.
Could not check encoder sensor, housing sensor wires broken off flush at sensor. All other sensors working.
Clean, inspect overall dimensions.
Replace bearing, o-rings, bellevilles, drawbar seal, snap ring and drawbar actuator.
Grind, chrome plate and finish grind the HSK 50 taper.
Machine damaged drive dog. Machine rear nut groove.
Adjust preload, balance, assemble and break in. Final quality control inspection.
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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…