The spindle taper was rough and only had 35% contact. The bearings had past their usable lifespan. We kiss ground the taper on our Kellenburger, replaced the bearings, rebuilt the spindle, test ran and balanced. We were able to obtain 90% taper contact and less than 1 micron run out.
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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…