The path of the tool is the trajectory and direction of the tool relative to the workpiece in the process of exponential control machining. The reasonable choice of machining route is very important, because it is closely related to the machining accuracy and surface quality of the parts. In determining the cutting route is the main consideration of the following points:

1) Ensure the machining accuracy requirements of parts.

2) Facilitate numerical calculation and reduce programming workload.

3) Seek the shortest processing route, reduce the empty tool time to improve processing efficiency.

4) Minimize the number of program segments.

5) To ensure the requirements of the roughness of the workpiece contour surface after processing, the final contour should be arranged for continuous processing of the last cutting tool.

6) The advance and retreat of the tool (cutting and cutting out) route should also be carefully considered to minimize the stopping of the tool at the contour (elastic deformation caused by sudden changes in cutting force) and leaving the tool mark, but also to avoid the vertical cutting and scratching the workpiece on the contour surface.