A method of minimizing transmission error in helical gears is presented. Using the concept of optimal modification of the plane of action to generate the new tooth profile, the idea of perfect plane of action of helical gears is introduced. The cubic splines are used to determine the optimal helical tooth profile. The method proposed in this work constitutes a general tooth correction method and makes the design, unlike other modification schemes presented in the literature, less complex and less sensitive to dynamic factors and retains the involute characteristics. Also the proposed method permits easier cutting of the tooth profile because of the simplicity of the process.
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