I know there's a thread discussing this, however i'm lousy at math.
I have a small .5 amp 1600 rpm motot with 1/4" shaft. I would like to use it for slow grinding if this is possible. If it is then what size pulleys would i use to bring a 3" gringing stone to approx. 90 to 160 rpm or what ever surface speed I would need.
Hope this explaines what I'm trying to do.
Thanks for any input.