What is up with the first pass? It starts in segments and then smooths out over the next few passes.Very interesting to hear and watch and to see a decent thread being cut. I am hypnotized watching it perform. The mathematical idea that you could match linear and rotational travel to a single point at 400-500 rpm is incredible.
Not sure what you are meaning by the first pass bit.
Heres a vid of my lathe doing the first op of the pullstuds I made for my Beaver Mill, not sure you will hear much though
http://www.youtube.com/watch?v=8J9q0NqoHhgThe material is EN24T and the thread was 16mm x 2mm pitch.
I also have a video posted of the full operation of the pullstud with the Computurn lathe and Bridgeport but its at much slower speeds as it was before I got the smoothstepper.
The pic below has the original pullstud for the mill on the right, the left is the ones I made and below is one of the ones I made for Brett (Chaoticone)
Hood