Video coming up. The big roller is not powered. The collet is on a geared rack which supplies the power to push bend parts. This is actually a very complicated (sophisticated) CNC tube bender. The collet pushes, and it also has a pressure die assist. The long clamp--behind the actual small clamp ( small clamp in front) actually pushes ahead with the collet to help the tube bend around the die. The order (in increasing sophistication) in the tube bending world is as follows.
tube bender, manual
mandrel tube bender, manual (the mandrel is little ball shaped thing that goes on the inside of the tubes to prevent them from crushing when you bend them)
mandrel tube bender, CNC
mandrel tube bender, CNC with pressure die assist
mandrel tube bender, CNC with pressure die assist and collet pusher
mandrel tube bender, CNC with pressure die assist, collet pusher, and a stacker. (The stacker allows you to bend 2 (or more) different radii in one set up.)
Ours is the last one. This is what allows us to make really, really tight bends. Also, we don't have to use a mandrel on the little 3/4 stuff because we can literally cram it into the die as we are bending it to prevent the wall from collapsing.
In this picture Sandwich is lining up the roll bender. I will post video as I know it is about impossible to explain otherwise. When you see a video, it all becomes clear.
