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paco,

You'll have to have gugi and Neil Miller further explain this to you.

I must be in error, but I've made grinders with a pulley mounted on the motor connected by a Vee belt to a pulley...

There should be a direct linear relationship between the difference in rotational speed and the difference in pulley diameters. So for you to step down a 1600 rpm motor to a 160 rpm grinding wheel...