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1994 Edition, October 1, 1994

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Computer-Aided Numerical Determination of Hofer, Lewis, Niemann and Colbourne Points

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In rating the bending strength of the hobbed gear teeth, the critical point located with in the root fillet, where the fracture occurs due to the tensile bending stress, is necessary to be determined Hofer, Lewis, Niemann, and Colboume propose their methods to find this point approximately, in which a numerical iteration method is needed to solve nonlinear onevariable equations established to find their critical points. This paper presents equations expressed easily and in a similar way for finding these four critical points as well as the general gear tooth profile equations derived based on the vector analysis method. These equations are assuredly solved by the finite difference Newton-Raphson iteration algorithm. Position comparison of their points was achieved with computer-aided graphical and numerical output.