Lathes and turning centers cut a rotating part with a stationary cutting tool. The tool moves parallel and perpendicular to the workpiece axis to provide the desired finished shape.
Milling machines move a clamped workpiece into a fixed, rotating cutter; or move the cutter itself into a stationary workpiece. There are two basic configurations: vertical and horizontal.
Steady rests and follower rests are lathe accessories that hold a long workpiece steady during turning. Steady rests are mounted to the bed and do not move with the lathe. Follower rests attach to the saddle and move along with or follow the lathe.