I have a 1/2hp ac motor that was used in a drill press that I want to use in my grain mill. I also have a variable auto transformer (variac) that I want to use to control the speed of my ac motor. Has anyone ever used one? All I have found online is that they are used to test equipment and for fan speeds. I am worried that it will heat the motor to much and cause a fire from either use or grain dust. Any help I could get would be great. Thanks!