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Ah, I guess I misunderstood the point of your post, my fault :o:fim:

I'm not trying to discredit you at all. I love reading the technical posts.

But we don't need a list of equations to know...

I agree that your calculations appear to be correct, and that the wheel speed is actually faster for the bench grinder than for the dremel, even given dramatic differences at motor rpm.

I'm just...

I think you are neglecting to think about the pressure being used. With the smaller contact area of the dremel, when using the same amount of pressure as the grinder, the PSI is through the roof. ...