If I really wanted a *true* variable speed lathe, I would purchase
a cone pulley machine and fit it with a three phase motor and a VFD.



I can't name a single cone drive lathe ever made. I know there were
cone drives made about 100 years ago but hardly think that is what you
are suggesting. By any chance are you refering to Reeves drives with
variable width pulleys? Leigh at MarMachine