I just finished building a CNC kit from Shapeoko and started cutting stuff. I needed a simple project that would be a bit more challenging than engraving my name on a piece of scrap wood. I decided to give a try to the Wobbly Circle presented by Matt Parker on the Numberphile Youtube channel. In this video, Matt Parker explains the mathematics required to assemble two disks perpendicular one to the other in such a way that their combined center of gravity always remains at th