1) measuring the angle between the front rake angle in the orthogonal plane rake face and the base surface between. Positive and negative direction shown by the provisions of the anterior horn, ie the tool rake face under the base when a positive rake angle, the tool rake face on the base when a negative rake angle. Rake angle is generally between -5 ° ~ 25 ° selection.
Rake angle selection principle: the size of the anterior horn of the main solution robustness and sharp tip of contradictions. Therefore, we must first be selected according to the hardness of the anterior horn of processing materials. High hardness materials processing, front corner take a small value, whichever is greater and vice versa. Second, we must consider the nature of the process according to the size of the rake angle, rake angle to take a small value for roughing, the rake angle should take large values for finishing.
2) After the main flank angle angle measured in the plane orthogonal to the plane of the cutting between. After the angle can not be zero or negative, is generally between 6 ° ~ 12 ° selected.
After angle selection principle: first consider the nature of the processing. When finished, the posterior horn whichever is greater, for roughing, rear corner to take a small value. Second, consider the hardness of the material processed, the processing of materials with high hardness, the main rear corner to take a small value, in order to enhance the robustness of the head; on the contrary, after the horn should take a small value.

3) the main angle measured in the base surface of the main cutting edge in the projection base surface and the angle between the direction of movement of the feed. Main angle is generally between 30 ° ~ 90 ° selection.
Main angle selection principles: First consider the rigid lathe, jig and tool consisting turner technology systems, such as sewing process system rigidity, the main angle should take a small value, such tools will help improve the life and improve the thermal conditions and surface roughness. Second, we must consider the geometry of the workpiece when the processing steps, should take the main angle 90 °, cut into the middle of the workpiece machining, and generally the main angle 60 °.