Mechanical installation for a BWA exposition "Jak nie później, to kiedy?". It consist of 2 parts: one is a hung rotating wheel, other is a slowly rotating floor-mounted 70cm plate with a counterrotating 110cm “orbit”. The exposition is live from 31/01/2020 to end of February 2020.
I don't have many materials to share and all of it was a custom job. I've learned some lessons that might come in handy:
The same technique can be used to cut a circular track in wood. Note: Don't use a 10mm cutting bit for cutting - with a couple meters of cutting I've created good couple litres of dust.
My approach to making the floor-mounted mechanics move was to rest it on a wheel mounted on a gear-reduced NEMA17 motor. None of the materials I've tried could get enough grip, the wheel was always slipping. At the end I've printed a wheel with recesses for sawing pins, cut off the heads and epoxied them in place. Mostly works, but they have a tendency to bend… Leave 1-2mms sticking out, and that is still no guarantee.
It's shit. Just don't bother. It fucked me over big time. Learn something better.