Abstract: A Portable Machining Turntable (PMT) (1) used in combination with a milling, grinding or drilling machine (101) to allow both single and compound angles to be worked. The PMT (1) is comprised of an integral housing (2) enclosing an electric stepping motor (23) that through two pulleys (22), (24) and a timing belt (27) drives a worm drive assembly (17). The worm (21) drives a worm gear (43) that rotates a rotary head (36). The power to operate the motor (23) is supplied and controlled by a conventional numerical control system. However, the PMT (1) includes a mechanical override that allows the rotary head (36) to be manually rotated. To operate the PMT (1) it is mounted to a mill bed by standard clamp blocks inserted into hold-down slots (14) located on the lower walls of the housing (2). The work piece is then attached to the rotary head (36) and the head is rotated to the desired work angle.