Can I desgn a rotating disc without using a centre shaft

[jeredane]

Is it possbile to spin a disc that has a hole in the centre like normal DVDs but without using a rotating centre shaft that is passing through the hole?

The spining disc has to be supported too by a structure. Is there any mechanism to recommend?

 

[ErikvdW]

Yes, it is possible. There are a number of ways to do this, but it all comes down to a rim attached to either the inside of the hole or the outside of the wheel. This rim slides through the supporting structure.

Some practical examples, demonstrated on bicycle wheels:
http://www.designboom.com/weblog/cat/8/view/11207/hubless-spokeless-bicycle-wheel-compilation.html

 

[jeredane]

Hey.. THanks for the reply!

How about if the disc is being spin horizontally? is there anyway of supporting the disc without the centre shaft?

 

[Jobrag]

Three or more rollers around the rim with one or more driven to provide spin.

 

[jeredane]

The following picture is a ride that i have design. the outer and the inner layers spin in the same direction and the middle layer spin in the opposite direction. how can i spin the outer layer of the ride and the middle layer of the ride? where can i place the driver?

If i were to use a planetary gear that is very big is it possible? Is there anyway to supend the gears in mid air and let it rotate?