I once used one once for cutting flanges on beams over twenty years ago.
I did one cut and went back to my guide bar. Fiddling around with setting
it up and having the torch tip sitting in a bushing style guide did not
impress me. The one I used had magnets for holding it in place. Getting
everything lined up on the cut line was bothersome.
I have also used air motor and electric driven units for cutting circles
with a hand torch. I found them handy if you were cutting dozens of holes
that were identical.

"Grant Erwin" wrote in message
...
In his book "Shop Savvy" Roy Moungovan of Popular Science describes a flame
cutting guide which has a "clockwork governor" which travels a constant
speed
regardless of irregularities in your pulling action. It is a magnetically
mounted device. It's pictured but not named on p. 58 of the edition I have.
What
a great thing, but unfindable. Said to be a commercial product, I can find
no
mention of it on the Web or anywhere in the Land of Google.

1. Anyone know what this device actually is, or where to get one?
2. How could such a speed governor work?

GWE