A method for calculating parameters of involute gear in inverse engineering

In order to simply calculate parameters of involute gear, a new method is presented in this paper. The main idea is: Firstly, the exact radius of base-circle can be requested through data of a series of points on the gear flank measured by the 3-D measuring machine, from which the modulus and the pressure angle can be obtained. Then, the real radius and thickness of the base circle are calculated. Finally, modification coefficient is obtained from the difference between the real base circle thickness and theoretical value. Based on this idea, we developed a corresponding software. Applications show that our method and the involved key algorithm are correct and reliable.