I've had an X2 spindle sitting around for the better part of a year, unusable due to damaged spindle bearings. Working on a fixed gantry mill idea, but needed a spindle, then it dawned on me that I might be able to build a spindle using the old X2 spindle shaft, some new bearings, and a new casing (just didn't want to mess with the cast iron one).
The spindle won't see anymore than 1hp, so R8 doesn't bother me much, and I might be able to make an ATC similar to Hoss's. The spindle will only be cutting aluminum so it probably won't be seeing any extreme forces, and will probably be using small cutters (0.25" - 0.375" with the occasional face mill/fly cutter), so it will need to be quick, shooting for 8-9k RPM.
Anyways, heres my parts list and some drawings:
Spindle Shaft
Lower Bearing - 6661K480 - 6207 ZZ Deep Groove
Upper Bearing - 6661K480 - 6306 ZZ Deep Groove
So, few questions for a bearing newbie like me. Will these bearings even work? The lower bearing should be press fit, and the upper should be a sliding fit for preload. But, I'm having a hard time finding actual tolerance information for these fits. Can anyone direct me to a good catalog with information on these types of fits?
Oh, last stupid question, I'm trying to find a 3-pronged internal micrometer, but for the life of me cannot find a source, anyone know where I can get one of these?
Thanks!