The use of CNC lathe axles for old cars is generally banned by the following problems:

1. Material problems: common and heat-treated materials are different in hardness;

2. Tool problem: the tool center is high, the knife is blunt, and the rigidity is lacking;

3. Measurement problems: common novices measure hand, measure ban, and see the lack of basic skills;

4. Machine problem: there is no compensation for the backlash caused by the wear of the old machine screw.

5. Processing technology: the knife-causing phenomenon in the programming, the feed amount, the cutting speed control is wrong, or the processing of the elongated shaft parts, the tail top pressure is too large, and the cutting allowance is large;

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