Why is it that when installing a boring tool on a lathe, the tip of the tool is lower than the rotation center of the workpiece, and its working angle is higher than the scribing angle: the rake angle increases and decreases. First, specify a point on the blade to determine the direction of cutting speed, and then the base plane is perpendicular to the direction of cutting speed.

The cutting plane is tangent to the machined surface and perpendicular to the base surface.

There are also orthogonal planes perpendicular to the first two planes. These three planes intersect at the specific point mentioned above.

(1) rake angle: the included angle between the rake face and the base face, measured in the orthogonal plane.

(2) Main relief angle: the included angle between the main relief surface and the cutting plane, measured on the orthogonal plane.

According to the above explanation, you can understand.

This is the basic theory of turning tool angle. If you don't understand, just look at the chapter on turning tool angle.

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