On Thu, 29 Sep 2011 07:25:06 -0700, Winston
wrote:

Still looking for a 'worm transmission' after all these years.

Old roto-tiller -- a worm on the shaft from the engine drives a worm
wheel on the tine shaft.

Also an old automatic stoker from a coal furnace. I've rigged several
useful ad-hoceries from one of the latter. A 3450 RPM motor produces 6
RPM output.

Here's a use-once widget for rotating 3-1/2" thick-wall tube while
beveling and then butt-welding:

http://home.tallships.ca/mspencer/img/bearing.jpg

and here's the same furnace stoker gear box set up for reciprocating
motion:

http://home.tallships.ca/mspencer/shop/lap-anvil.html

And here's the same gear box driving the original stoker screw to
crush oversize forge coal:

http://home.tallships.ca/mspencer/temp/crusher.html

--
Mike Spencer Nova Scotia, Canada