Worm and worm gear transmission is a commonly used type in mechanical transmission. An important parameter affecting the transmission accuracy is the index circle. In the turning of the worm, the diameter of the indexing circle is usually measured by a three-needle measurement method. The three-needle measurement method is a relatively precise method. In the process of calculating the M-value of the three-needle measurement, the operator usually directly substitutes the indexing circle diameter, the pitch and the tooth-shaped angle of the worm into the measurement calculation formula.
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