Its function is to direct and facilitate the flow of the chip over the face of the tool and to modify and control the cutting forces which are also affected by the shear angle
The angle between the face of a saw tooth and an imaginary line perpendicular to the baseline of the saw teeth or front of the saw, seen when viewing a saw from the side It is generally 12 to 15 degrees on a crosscut saw, and zero to eight degrees on a rip saw
The angle the tooth face makes with respect to a perpendicular line from the back edge of the saw band It is positive when the | tooth angles forward in the direction of the cutting action and negative I when it angles backward from the direction of the cutting action