In CNC programming, when a workpiece contour or a three-dimensional surface contour composed of non-arc curves is encountered, it can be done with a macro program. 1. Macro programming of non-circular lone curve In the instruction system of NC programming, linear interpolation and circular interpolation instruction are used to complete the actual cutting of the workpiece. When the cutting profile of the workpiece is a non-arc curve, the circle cannot be directly used. The arc interpolation instruction is programmed. At this time, it is conceivable to divide this non-arc curve contour into several small segments, and straighten each small segment on each segment.
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