Asked, and based on the VB of the secondary development of Autocad standard involute cylindrical gear automatic 2 d modeling program (if a great god can do, for a private talk)

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https://wenku.baidu.com/view/534b6091541810a6f524ccbff121dd36a32dc491.html
https://wenku.baidu.com/view/f77e0034ff4733687e21af45b307e87101f6f88c.html