speed of grinders

Slow grinder obviously makes overheating the tool a little less likely. Both are fine and if my slow grinder dies it will likely be replaced wtih a

Billh

snipped-for-privacy@comcast.net (Phil)

I have only a guess, but I think that the two rmps are industry standard for small electic motors in general, rather than having anything to do with how best to do offhand grinding.

The 3400 sounds to be more a European standard (again, just a guess).

For small-shop tool grinding, slower is better. But the best results probably have much more to do with the composition of the wheel employed than the speed of the grinder. FM

For your HSS lathe tools, speed probably doesn't make much difference. For your carbon steel woodworking tools it will.

Only advantage to the faster grinder is if you are actually forming, not refining or sharpening.