Assume that all gear blanks are solid circular cylinders unless specified otherwise.
Suppose that a pair of quality class 10 gears is designed to operate with the following characteristics:
Pressure angle = 25°
Teeth are AGMA full depth, equal addendum with HPSTC loading
Diametral pitch = 12 teeth per inch
Face width = 2.00 inches
Pitch line velocity = 1000 ft/min
The pinion has 21 teeth and is made of grade 1, through hardened steel with HB = 350. The gear has 35 teeth and is made of the same material. The gears have solid disks and operate at temperature of no more than 180 °F. If the factor of safety SF is 2.0, determine the maximum allowable tangential load the gears can transmit. How would this answer be different if the pressure angle were 20°?
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