Worm gears - Worm profiles and gear mesh geometry

ISO/TR 10828:2015

ISO/TR 101828 describes thread profiles of the five most common types of worms and formulae of their axial profiles are given. The five worm types covered in this technical report are designated by the letters A, C, I, K and N. The formulae to calculate the path of contact, the conjugate profile of the worm wheel, the lines of contact, the radius of curvature and the velocities at points of contact are provided. At the end the application of
those formulae to calculate parameters used in load capacity calculations are provided.

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