In the gear measurement, the parameters such as the cumulative error of the joint, the variation of the length of the common normal line and the deviation of the average length of the common line are very important. At present, the actual measurement of these parameters by the factory is also common, but the data processing of the measurement results is very troublesome. We use a computer to This work is very effective. I. Measurement of cumulative error of the weekly section The cumulative error ΔF_? of the weekly joint refers to the maximum difference between the actual arc length and the nominal orphan length between any two ipsilateral tooth faces on the index circle, that is, the maximum cumulative pitch deviation ΔF_ (Fm?) cumulative deviation from the minimum circumference
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