Because the tooth profile of the gear is determined by the base circle size of the gear, the base circle is related to the size of the gear, the number of teeth, and the angle of the tooth. Therefore, the modulus and the tooth-shaped angle of the same tooth number of different gear, there should be different milling cutters, so it is necessary to create many different tooth shape of the milling cutter, very economical. To this end, the same modulus, tooth-shaped angle of the gear plate milling cutter, according to the number of teeth processed gear and numbered, the same number of gear milling cutter first to process the number of gears, the tooth shape error, the accuracy of the gear is not high requirements are allowed. This is more economical and easy, so the gear-plate cutter should be semicolon-delimited.