Abstract: A two axis numerically controlled contour boring machine adapted for interior and exterior machining operations such as boring, facing, grooving, turning and back-facing. The machine comprises a headstock slidably driven along a first axis by a feed motor. The headstock supports a rotatable contouring head having a radial slide which is driven along a second axis perpendicular to the first axis. The radial slide is spindle actuated and includes adjustment means for removing backlash in the drive. The radial slide is adapted to hold quick disconnect type tools selected for the particular machining operation or operations called for by the machining program. The desired contours are generated in the workpiece by the combined motion of the headstock and radial slide along their respective axes under numerical control.