Understanding the spline indexing error

In the national standard GB5106—85 “Cylindrical straight-toothed open-line spline gauge”, the positional tolerance of the spline is replaced by the “index tolerance” instead of the “circumference tolerance of the week”. Let me talk about my understanding. 1. Define the cumulative error of the weekly joint △F_(p∑): On the indexing circle, the sum of the two absolute values ​​of the maximum positive and negative errors of the ipsilateral tooth profile deviating from the theoretical position is shown in Fig. 1.

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