This paper proposes a new method which generates offset curves used to obtain NC machine tool paths. A basic idea of the method is to utilize a called offset curve zone where the offset curves of each side constituting the profile of workpieces are generated. Using this method, we can generate the offset curves without being conscious of unnecessary offset curves often appeared in use of other methods and efficient tool paths because there are almost no overlaps of tool paths. For example, this method is applied to workpiece profiles consisted of the segments of straight line and circular arcs to generate the offset curves for tool paths in a two-and-a-half dimensional pocket cutting.

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