Back Angle
It is the angle between tungsten carbide serrated blade and the machined surface, typically the angle is 15 degrees. Its role is to prevent jagging and machined surface friction, the greater the back angle, the smaller the friction will be, it also suggests more smooth processing processes.
Wedge Angle
It is the derived corner of front corner and rear corner . The wedge angle can not be too small, it plays a role in keeping the teeth strength, heat resistance and durability. Specially the sum of the front angle, back angle and the wedge angle should be equal to 90 degrees.
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