I have a HF 7 x 12 mini lathe and a HF mini mill which both have a variable speed dial. Does anyone know if you set the dial to the mid point if you are actually turning at half the max rpm for that high or low speed. Trying to guesstimate rpm. Maybe someone that has attached a tach would know. Otherwise how do you all set the speed by material, etc. Just by feel and how it is cutting.