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I also fine that the lower SFM gives a better polish. I'm sure that there are other techniques that can give the same results at a higher surface speed. Be sure to check the Caswell link I posted to...

+1 on Glen with surface speeds. Here is a link to Caswell plating and it addresses most of the items you should consider when choosing a buffer/grinder. RPM's plays into it but only as part of an...