A narrow land is ground on the flank to form the relief angle, which has a high life due to the reasonable cutting angle. The tooth back of the sharp tooth milling cutter has three forms: straight line, curved line and broken line. Linear tooth backs are often used for fine-tooth finishing milling cutters. Curved and broken line tooth backs have better tooth strength and can withstand heavier cutting loads, and are often used in coarse-tooth milling cutters.

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