Algodoo

Very clever! The cam profile looks counter-intuitive that it would produce the resulting wave shape. But the proof of the pudding is in the eating, so they say.

Now you should come up with a kit for making all sorts of cams! Don't forget to keep your derivatives continuous lol. Neat scene, especially with the follower controlling the arm. How exactly do you get all those pieces it leaves behind to form one shape? I'll post a little thing with cams I've been playing with soon!

Q: How exactly do you get all those pieces it leaves behind to form one shape?
A: I had done it using Combine Shapes > Add, but recently found a better way. Use the brush tool with a brush size about half the size of the circles you want to join together. Check the Brush > Merge checkbox. Brush a line thru the center of all the circles. The circles will combine as you brush over them. For best results, do short sections at a time.