Sorry for the OT post but I think this is probably the best place for some ideas for this problem.
I want to make a sort of "turn table" large and strong enough for an adult to stand on.
The bearing needs to be robust enough to carry the weight but as "frictionless" as possible. The application is to demonstrate gyroscopic and similar effects in a school.
So, suggestions for an existing bearing I could adapt or simple fabrication ideas would be appreciated.
(I want something that is stays together- I've dismissed grooves and marbles.)
Thank you.
Brian