Cam and Follower

From "[Making Mechanical Marvels in wood](https://www.amazon.com/Making-Mechanical-Marvels-Wood-Raymond/dp/1626548862/ref=tmm_pap_swatch_0?_encoding=UTF8&qid=1553915821&sr=8-1-fkmrnull)"
>A cam is defined as a machine component with a surface whose profile sets in motion another part called the follower in the desired speed and distance. Cams can be made that rotate, reciprocate, or do a combination of both. This model is a rotary cam which has a number of lobes of different heights and spacin