From: null@void.com   
      
   Hey everyone   
      
   Earlier in the "fwiw - rod-mill project start" (concentrating then on   
   "metallurgical" part of rod-mill) someone mentioned continuously   
   variable transmission speed ratio using two disks, with one impinging on   
   the other at right-angles.   
      
   https://en.wikipedia.org/wiki/Friction_drive   
      
   It came to me - that would be neat in this application.   
   Put it close to the motor at high speed, so small and limited torque.   
   Came back to me when some single-phase motors on offer are 2-pole   
   3000RPM.  That could be turned into some degree of advantage if had a   
   disk on motor-shaft and its counterpart disk at right-angles and where   
   it touches the motor disk gives the exact speed ratio.   
   With high speed (not a problem for the drive) and low torque (advantage   
   for this drive).   
      
   The drive from then-on being by belts.   
      
   The position of the second disk could be fixed and you could slide the   
   entire motor along to change speed-ratio.   
      
   Would be brilliant for a tumbling-mill - rod-mill or ball-mill.   
   Could adjust until get the ideal "cateracting" (the grinding medium and   
   ore detaches from the wall of the shell at about 2/3rds height of shell   
   and crashes-down on the opposite wall at about the "7 o'clock" position)   
   or "cascading" (the grinding medium and ore tumbles back over itself   
   after being climbed some way up the side of the shell).   
      
   Thanks.   
   It's a positive thought...   
      
   Best wishes,   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)