In the daily repair and mapping process, it is difficult to accurately measure the spiral angle. In the past, the rolling method was generally used to leave the top marks on the white paper. It is measured by the angle ruler (see figure), which is more troublesome and the measured spiral The angular error is large. To this end, according to the combination of gear calculation formula and actual measurement, the survey results are more accurate. Calculate the formula according to the helical gear:
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