Too_Many_Tools writes:

On Nov 14, 11:56=A0pm, Mike Spencer wrote:

...the big motor on the treadmill had a variable-pitch V-pulley....

That is called a Reeves drive.

Didn't know that.

Very expensive...very good...variable speed constant torque
applications.

After a quick google, I think this treadmill setup kinda did it on the
cheap. Only the motor pulley is variable. The motor mount is slid
along rails by a separate gear motor to force the belt into the sheave
(thus reducing diameter) or the reverse.

Now I have to go have another look at it. Maybe good for a drill
press that I want to restore this winter. It maybe could replace the
stepped flatbelt rigamarole. (Yeah, an *old* drill press.) Gotta
finish the cider pressing and then glue up the new kitchen worktop
first to make space.

I vaguely recall seeing a weird little car that used a more
sophisticated version of this in the mid-60s. DKW? DAF?

Tnx,

--
Mike Spencer Nova Scotia, Canada