My mill has the O.E.M. MRC 107 KSF DS, and the MRC 108 KSF DS bearings in it. Since these bearings are supposed to be ground on the inner race for a slight bearing preload, I cannot see that what ever you tighten the nut on these bearings to that it would make a difference in bearing preload. The inner race is touching for slight preload and the outer race is touching each other, so is it not preset no matter how tight the nuts are?
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21-100 Bearing Preload
- Thread starter miles&me
- Start date
- Joined
- Dec 12, 2016
- Messages
- 493
That is correct, the preload is built into the original bearings.
See my related thread for upgrading to angular contact prearings (preloaded, at spindle end) or shimming ball bearings for preload (spindle pulley):
www.hobby-machinist.com
See my related thread for upgrading to angular contact prearings (preloaded, at spindle end) or shimming ball bearings for preload (spindle pulley):
Rockwell 21-100 Spindle Rebuild
Re-posting after server crash issue... I recently acquired one of these vertical mills, and will be rebuilding and refinishing it as time permits. Most of it is still in pieces, but I managed to just complete the spindle rebuild. I leveraged some ideas posted on the Yahoo Rockwell Milling...
www.hobby-machinist.com