Matt, I guess I'm spoiled. LOL The grinding I get for spindle bearing fits are in MICRONS. Visualize half-tenths. Not cheap but worth it.
You'll find the more precise the bearing, the more precise the fits.
I'm working on the design for a 20,000 rpm grinding spindle right now. It's driven by a 27kw (36hp) motor. It will use ABEC 9 ceramic angular contact bearings.
Tolerances for the shaft and housing are +/- 3.5 microns (.00014"). The grinder guy asked if I'd prefer holding it to the high or low side!!!!!! LOL
I agree this is not for the DIY home shop. Typically you can probably get away with ABEC 5 and then the tolerances for the bearing dimensions open up a bit as well as the shaft and housing dimensions.
Fun stuff.
Dick Z
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