Programming skills of large NC lathe machining：
1. Processing sequence of parts:
(1) Drill first and then flat end (to prevent shrinkage during drilling).
(2) Rough turning first, then fine turning (to ensure the accuracy of parts).
(3) First process those with large tolerance and then those with small tolerance (ensure that the surface with small tolerance is not scratched and prevent parts from deformation).
2. Select reasonable rotation speed, feed rate and cutting depth according to material hardness:
(1) Carbon steel materials are selected with high speed, high feed rate and large cutting depth.
(2) Low speed, low feed rate and small cutting depth are selected for cemented carbide.
(3) Low speed, high feed rate and small cutting depth are selected for titanium alloy.
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