This high speed spindle had a worn ball cage housing. This must be properly measured and held to particular tolerances as it determines the preload of the bearings. As the shaft heats from normal usage it thermally expands, the ball cage lets it “grow” towards the rear of the spindle allowing consistent bearing preload and the ability to hold part tolerances. If the ball cage is not functioning properly it can cause high bearing preload, looseness in the spindle assembly and premature spindle failure.
Possible cause of failure:
Shaft pilot has damage, broken off quill in the pilot.
Bearing’s sound rough when spun by hand.
Rear housing od ball cage slide has -16/-18 slide
Front shaft nut needs to be replaced.
Rear shaft screw is worn.
Clean, inspect overall dimensions.
Replace bearings, orings and screws.
Manufacture a new shaft.
Grind, chrome plate and finish grind the housing od for proper ball cage fit.
Manufacture a new front shaft nut.
Manufacture a new rear shaft screw.
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…