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Bevels depend on how thin you grind the steel on the very edge, the grind isn't that important. You can make a full hollow have a very large bevel, and a wedge have a very small one, no problem.

I have finished a razor on a 5" grinder with 2850 rpm, but it was a bit scary :) You have to do things very fast, and very light not to overheat the very edge. 900 rpm should be much better that what...