mach3 is an extremely powerfull program (not seen at first)
it can nicely run old dc servo drives etc etc with the right hardware. took me a lot of research but well worth it.
i use the galil motion controller with mach (80 input/outputs, analogue servo control,analogue vfd, analogue input feedback etc)
The machines i convert are big! 5 tonners but now ive got the speed plus accuracy i need and for peanuts
see my utube to see what this control combination can do with a bit of vb programming (which i had never done before)
i dont know if everything works properly with lathe but the mach plugin guys will iron out any bugs for you as found. they have been amazing with my projects which i would say are 99.8% right now