Toothed gears with an internal and an external gearing are widely dispersed nowadays. The extent and versatility of these gears are increasing not only in mechanical engineering. It is necessary to use high quality FEM software for a competent assessment of these gearings. However one problem occurs here — it is not easy to create an input data file describing the tooth profile shape and its root fillet in a 3D space. Moreover with regard to the type of a tooth profile curve (an involute), it is very difficult to enumerate equidistant spacing among points laying on this curve when preparing data for a FEM calculation. This equidistant spacing is important for good contact stress analysis during teeth meshing. It is impossible to get these data by ordinary methods. This contribution presents a numerical method suitable for calculating these equidistant spacing coordinates of points.

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