main reason
Cutting edge is too large; high-speed cutting thread, the cutting thickness is too small or the direction of the chip to the tilt discharge, the tooth surface has been processed tooth; the workpiece surface of the workpiece; Rigidity is poor, and the cutting amount is too large; turning tool surface roughness difference.

Solution
Cutting with high-speed steel cutting tool should reduce the cutting speed, and the correct choice of cutting fluid;
Increase the shank section, and reduce the handle extension length;
Reducing the radial rake angle;
High-speed steel cutting thread, the last knife chip thickness is generally greater than 0.1mm, and the chip along the vertical axis direction of discharge;
Choose a reasonable amount of cutting;
The surface roughness of the cutting edge should be 2 – 3 grades smaller than the surface roughness.

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