Abstract: A control system for moving a machining member relative to a workpiece table in accordance with a set of programmed input instructions which correspond to a prescribed path of movement, including a main contour control logic to generate output signals to move the machining member relative to the table in accordance with the stored values of the components I and J of a main contour vector, a sub-contour control logic which generates output signals to move the machining member based on the stored values of the components i and j of a sub-contour vector, and cutter compensation control logic which enables either the main or the sub-contour control logic to operate based on a determination of whether the main contour vector is leading or lagging the sub-contour vector.

Abstract: A control system for positioning a machine member in accordance with a set of predetermined instructions corresponding to a prescribed path of movement of the machine member includes first and second motor driving means operative in two mutually perpendicular directions to drive the machine member, pulse generating means to actuate the motor driving means, and a contour logic circuit to enable operation of the motor driving means in such a way that the machine member follows a staircase path closely conforming to the prescribed path. Drive of the first motor driving means is continuously maintained and drive of the second motor driving means is permitted only when required, then drive of the second motor driving means is continuously maintained and drive of the first motor driving means is permitted only when required.