Abstract: A numerically controlled machine tool system which is responsive to a succession of stored data sequences to control the position of a cutting element with respect to a workpiece affixed to a workpiece positioning table. Each data sequence is associated with a point on a desired workpiece contour and includes data representative of a desired offset path which is parallel to and offset from a direct path of a selected type which intersects that point. During the machining mode of operation, the system determines a path segment for the cutting element to follow in association with a selected current sequence. For the current sequence, the system addresses only sequences in a contiguous group of sequences that includes the current sequence, and that relates to an identified portion of the desired workpiece contour. The system considers that contiguous group of sequences as forming an endless loop wherein the last sequence of the group precedes the first sequence of the group.

Abstract: A system in which a machine tool is controlled by a digital computer and an operator to perform a succession of machining operations at a succession of spatial points. The system includes means for operator-controlled entry of data defining the succession of machining operations to be performed, and position data representative of the absolute or incremental coordinates of the spatial points. The position data is stored in absolute coordinate form. In a run mode, the system selectively transforms the stored absolute coordinate data and the machining operation data to control signals for the machine tool.

Abstract: A system in which a machine tool is controlled by a digital computer and an operator to perform a succession of machining operations. The system includes means for operator-controlled programming of a succession of machining operations, including single sequence programming of repetitive drilling operations, and programming of helical path operations. In the programming mode, the operator may direct the automatic selection of the first unprogrammed sequence. The operator may also direct the automatic plane or axis switching for the programmed sequences, rapid feedrate runthrough, and absolute and incremental data entry operations.