I watch Woodwright's Shop regularly, with Roy Underhill. ast week, or maybe the week before, the entire episode was on a Barnes (sp?) foot powered metal lathe. He is no machinist, to be sure, but he demonstrated threading, and turning a 60° point for a spring-pole wood lathe using the metal lathe. I'd love to run across a foot powered lathe. You might be able to find out something on the PBS website about that episode. It was interesting as he showed a little about the mechanism that powered it. It was a simple pedal crank system like a bicycle, but using leather belting along with some chains I believe.