(1) The strength and hardness of the workpiece material are high, and the rake angle should be selected smaller; otherwise, a larger rake angle can be selected;
(2) When processing plastic materials, a larger rake angle should be selected; when processing brittle materials, a smaller rake angle can be selected;
(3) During rough machining, in order to ensure that the blade has better strength and heat dissipation conditions, the rake angle should be selected to a small point; during finishing, in order to improve the quality of the machined surface and make the blade sharp, a larger rake angle should be selected;
(4) High-speed steel tools have good bending strength and impact toughness, and a larger rake angle can be selected; carbide tools are poor in these two aspects, and a smaller rake angle should be selected;
(5) When the rigidity and power of the machine tool are insufficient, a larger rake angle should be selected to reduce the cutting force and cutting power and reduce vibration;

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