Quote:
Originally Posted by mpierich
The size of the pulleys _does_ change the rpm. A 4" pulley on the motor going to a 2" pulley on the tool will give the tool double the rpm's of the motor. The converse is also true. It's a direct ratio.
Think of it this way...say the 4" motor pulley moves one rev, which say moves the belt 6" (or whatever the circumference is) along its path. It also moves 6" at the 2" tool pulley, but since the 2" pulley is only half as big, it has to move more than one rev...two revs to be exact, since it is half as big as the 4".
Hope that wasn't too involved. In short, if you want the same revs, use the same size pulley at both ends.
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Thank you mpierich, a fine re-enforcement of what baz revealed. I now understand, for myself this is going to be a more flexible, and less expensive route to buffing.