The feed route of precision processing is basically based on the outline of its parts. Therefore, the focus of determining the work of the feed route is to determine the admission route of coarse machining and empty itinerary.

In the processing of CNC lathes, the determination of the processing route generally follows the following principles.

① It should be able to ensure the accuracy and surface roughness of the processed workpiece.

② The shortest processing route is the shortest, reduce air schedule, and improve processing efficiency.

③ Try to simplify the workload of numerical calculations and simplify processing procedures.

④ For some reusable programs, sub -programs should be used.