What is the difference between Lathe and milling machine?
There is a general rule of thumb, with a lathe, the work turns and the tool is stationary and with a mill, the work is stationary and the tool turns.
With a lathe, one usually clamps a piece of material in the jaws and spins it. Then the tool is pressed into the piece to cut grooves, facing, OD turning, knurling, or some other deformation, as the piece spins. Or a drill can be attached to the tailstock to drill in the center of the piece. The lathe produces a concentrically uniform piece.
With a mill, one usually clamps a piece of material to the table. Then the tool spins and the table moves as the spinning tool cuts into the part, or the table stays in the same spot and the tool moves to cut the piece.