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From: Richard Smith <null@void.com>
Newsgroups: rec.crafts.metalworking
Subject: Re: rod-mill project - "mains" electric motor advice
Date: Wed, 16 Apr 2025 12:26:15 +0100
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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,