In order to ensure that the workpiece contour surface after CNC machining is rough enough, the final contour should be continuously processed in the last tool feed. The machining route is a very significant link. Machining path is the motion trail in the cutting phase of the tool location in relation to the workpiece. It not only contains the machining process material, but also represents the machining sequence structure. The machining route is also a vital source for the machining software to be compiled.

1. The machining path shall ensure the precise workpiece and its surface roughness.
2. Production path architecture can minimize empty travel time and enhance processing speed.
3. Simplify the numerical estimation and reduce the workload program fragments.
4. Assess the cycle processing amount according to the form, rigidity, machining ability and rigidity of the machine tool device of the workpiece.
5. Reasonably plan the cutting direction in and out. To prevent positioning errors induced by reverse clearance of the transmitting grid, the unidirectional approach positioning procedure is used.

6. Rational frictional or reverse friction range. The ball screw is usually used in CNC machinery tools and the travel clearance is very limited, so the benefit of forward friction is greater than reverse friction.

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