Thanks Dave..
It seems some systems just use some sort of peg that follows a flute and pushes the tool around but I cant see that as being effective when trying to turn that lathe spindle so I am wondering at some scheme of extreme ratio change gears so that turning the lathe feed screw would move the carriage and turn the spindle at the appropriate rate, are there machines out there that use the method?
P.S. I am not really thinking of using this particular lathe for the job, more likely one of my smaller ones but that is the only one I had enough bits on hand to lash up and show the idea.