New concept for gear reduction and zero friction movement with zero slippage of axis?
 

see http://www.youtube.com/watch?v=O-1Drlfuoi4 and articles at http://www.rexresearch.com/wilkes/1wilkes.htm. This looks like a simple solution for gear reduction and zero friction movement with zero slippage of axis. Look at it and post comments.

A topic for CNCzone. Not suitable for MechMate