2 days ago More heat in the grind zone will soften the wheel quicker, increasing the odds of early wheel wear. 7. Machine/Spindle Horsepower. The horsepower of the grinding machine can play a role in determining the grade of the bond or the hardness of the wheel. When a machine has a higher horsepower available at the spindle, harder wheel grades are wiser. This course is a continuation of Machine Shop Theory 1. This lecture-based course will use lecture, group work, and individual projects to introduce you to surface grinding, CNC theory, application, programming, and inspection procedures. PREREQUISITE 32420306 Machine Shop Theory 1. New Richmond. Spring 2022.