williams patent crusher pulverizer co. hammer mill w/ 100 hp electric motor. $9,500.00. or best offer. hammer mill hemp grinder - 7.5hp gasoline powered usa in-stock w/support. $2,595.00. free shipping. 5 watching.,mini mill comparison,the 500 watt (0.67 hp) brushless spindle drive motor provides tremendous low end torque. and you can vary the speed from 50 rpm to 2500 rpm continuously. there are no gears to shift. and, with no gears, the hitorque mini mill is the quietest in its class. the large mill table provides 50 more table area than other mini mills.