Cause of Failure, Observations, and Comments:
Customer sent spindle in for poor part finish, bell mouthed Big-Plus 40 taper, noisy bearings.
Tooling rocks in the taper, taper has deep pock marks & excessive runout.
Drawbar shaft has scoring from bellevilles.
Bearings feel rough, no obvious contamination: failure from use.
Clean, inspect overall dimensions.
Grind plate grind BIG PLUS 40 taper to BIG PLUS specifications
Grind plate grind drawbar
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…