I've got a question about the preload of the spindle bearings.
I've got a Rongfu 25 and changed the spindle bearings (30205 and 30206 tappered roller bearings)
When the mill turnes at high speed (2150rpm) the bearings gets slightly warm, not to much, however I can hear a rattling sound. I think I hear the bearing cages.
Does this mean the preload is to little?
I installed the bearings without oil. so I could very good feel if there was any slop on the setup. I tightened the nuts to have just a little preload and put the grease in the bearigs.