I took the motor out of wash machine and it says its a 17,500 rpm unit. The circumference on pulley is 3 inches. So i double that size in the other pulley the rpm of other pully should be half of electric motor, correct? I want to get down to 2ooo rpms. I sure could use my dad on this one!! He was a inventer and all most a genius in making electric tools he wanted in his wood shop. He had some tools that he would make for a big job and never use them again unless the need arose.