An easy way to guarantee the quality of herringbone gears

It is well known that when cutting a herringbone gear, the two halves of the herringbone spiral must be placed at the midpoint of the undercut. The error is recommended according to the "Mechanical Engineering Manual": the gear with 8 precision is within 0.5mm, and the gear with 7 precision is within 0.2mm. Figure 1 is the herringbone gear in the gearbox of our factory. The normal modulus m_(?)=8, the number of teeth z=20, the tooth angle α=20°, the helix angle β=9°26', the accuracy is 8FH. Past me

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