Now I know that levers, wheels, screws, inclined planes, wedges, and pulleys (which I believe are actually levers in disguise), are the classical simple machines from way back when. Although I can classify things into these categories, I'm having trouble determining which of them a cam/eccentric fall into. They could be wheels, or they could be inclined planes...? If anybody hase some insight, clearing this up for me would really help! Thanks, PenguinCo.