Toroidal CVTs?

[Mooselake]

If you were just making it as a display or demo, and didn't need to handle any real power, you could try spraying it with plasti-dip.  No guarantees but they claim to be a non-slip coating.

Instead of wood you could try 3D printing one, or maybe get one of the 3D printer guys here to give it a try.

Sounds like a fun project.  Post pictures if you make one; maybe Art'll add it to that endless list.  Thanks for the link to linkages, too.

Kirk

[chrome700]

What's the best rubber like material to CNC?

Again, may ultimately have to build a model and experiment.

[ArtF]

Actually, youd want to make the top and bottom from metal and use rubber wheels as the  side pinions.
If you look closely, youll see the top and bottom are not smooth, they have 45 degree slopes machined into them
to create ridges that will engage the rubber wheels to roll them.
The rubber wheel on the sides are then exposed to ( what is to the wheel 90 degree ridges) on the top and bottom
cones, this 90 degree ridge then rolls the wheel just iike a gear tooth that doesnt have to mesh.


Art

[ArtF]

Or at least thats my theory.. :)
Art

[JustinO]

Frozen rubber is the most rubber like material to CNC.


Friction transmissions like this need to be high speed/low torque. I saw a Sears and Roebuck car that had a disk/wheel variable speed transmission, and my Dad's HiFi turntable had a disk/wheel speed control...