I was doing a long machining op @ 6500 RPM this morning when my spindle motor started surging some. I reached up and felt the bottom of the spindle and now have some blisters. It was pretty darn warm is all I can say. Kubler grease was dripping out so....

When I did the pulley conversion I also changed out the bearings for some Timken high speed "cone" bearings and they have been running 100 to 105F during a run but they suddenly started getting very hot, so either the preload is too high or they are coming apart. I doubt they would run for this long with the preload to tight and not show signs of heat.

Anyways, I know Gary, Pete, and Jid I believe went with AC Bearings in their spindles. Hopefully, maybe one of them, or someone else will chime in and let me know how many and what size I need so I can get them ordered. I take it all the AC bearings are still running good?

Any help would be most appreciated. ATC still running like a champ.

Richard