| 摘要 |
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. For a current sequence, the system looks ahead to the next subsequent sequence and looks behind to the next previous sequence, determines offset paths associated with those sequences (in accordance with the offset data stored in association with the respective sequences), identifies the point of intersection of those offset paths, and then controls the cutting element to this intersection point. This operation is repeated in the machining mode of operation for each sequence in succession as the respective ones of the sequences become the current sequence, thereby permitting automatic cutting element path control together with desired selection offset values for use with individual machining operations.
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