Hope you are aware that you can't simply ask a program to "digitalize" a part. Unless you have a 3d scanner. I know that some company's (PWC, Bombardier, etc..) have 3d scanners made by FARO. If you can't put your hands on that kind of scanners then you will have to draw it by yourself with a 3D program (Inventor, Solid work, Catia, etc...) by using manual mesuring tools. When you have a 3D drawing you can now start your program for your kind of lathe depending on the program that runs it(Mazatrol, Fanuc, Heidenhein, etc...) using a program like Mastercam, Catia, etc...
Also, like said before, a 3D lathe is very expensive...
SHM - JEEPEE
Fier membre de la Légion!