Making a Straight Rod Through a Curved Hole Demo

I made a compact version of this classic science museum demonstration, the rotating rod appears to magically pass through a curved slot. At first glance the motion seems impossible, however after a close look you can get some intuition of why this can work.
My version has a few extra features I find helpful to fully understanding what's going on here. I added the option to rotate the rod in 30 degree increments, so it's easier to observe how the cross section looks in different rod angles.

For more information, including detailed dimensions, templates and 3D models visit:
https://www.rad-head.com

I also made a video explaining the math behind this motion:
https://youtu.be/U1nT8uw6fBY

If you like what I do and want to support rad-head:
https://www.patreon.com/radhead
If you want one, but not into building this your own, there're a couple of options out there:

- A unique clock that uses these mathematical concepts is sold by the guys over at maths gear
https://mathsgear.co.uk/products/hyperbola-clock

- A beautifully designed 3D printed version from Devin Montes
https://www.devinmontes.com/store/straight-pole-curved-hole

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