PURPOSE: To efficiently execute three processings of beveling, facing, and screw thread cutting for the hanger lug of a car by using one unit of machine only, keeping the lug installed onto a frame.

CONSTITUTION: A hanger lug 8 which is a workpiece is installed at the center of a machine bed 11, and each unit having a same construction and the same function is installed at the both sides 8a and 8b at right and left. A tap 1 is fixed onto a supporting shaft 1, and the other edge of the supporting shaft is connected to a rotary shaft. The tap 1 is fixed onto a tap holder 4 together with the supporting shaft, and at the same time connected to another supporting shaft 5. Beveling and facing are executed at the same time by the aid of automatic control, and then screw thread cutting by the tap is executed.