Pitch cone angles

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1.       A 90° straight-bevel gearset is needed to give a 9:1 reduction. Determine the pitch cone angles, pitch diameters, and gear forces if the 25°-pressure-angle pinion has 14 teeth of pd = 6, and the transmitted power is 746 W at 1 000 pinion rpm.
2.       A 90° straight-bevel gearset is needed to give a 4.5:1 reduction. Determine the pitch cone angles, pitch diameters, and gear forces if the 20°-pressure-angle pinion has 18 teeth of pd= 5, and the transmitted power is 7 460 W at 800 pinion rpm.
3.       A 90° spiral-bevel gearset is needed to give a 5:1 reduction. Determine the pitch cone angles, pitch diameters, and gear forces if the 20°-pressure-angle pinion has 16 teeth of pd= 7, and the transmitted power is 3 hp at 600 pinion rpm.

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