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Machinery's handbook confusion

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  • Machinery's handbook confusion

    In the 27 and 17 editions it says that the cutting angle on a 16 tooth, 10DP bevel gear is the pitch cone angle (which I have) minus the dedendum angle (which I also have) giving me a cutting angle of 18.72687144 degrees. When you read the section on thinning the gear tooth it says that the cutting angle is the pitch cone angle minus the addendum angle giving me a cutting angle of
    19.14342808. I am confused. Do you use a different cutting angle when thinning the teeth?
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