Solved: An uncrowned straight-bevel pinion has 20 teeth, a

Chapter 15, Problem 15-1

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An uncrowned straight-bevel pinion has 20 teeth, a diametral pitch of 6 teeth/in, and a transmission accuracy number of 6. Both the pinion and gear are made of through-hardened steel with a Brinell hardness of 300. The driven gear has 60 teeth. The gearset has a life goal of 109 revolutions of the pinion with a reliability of 0.999. The shaft angle is \(90^{\circ}\), and the pinion speed is 900 rev/min. The face width is 1.25 in, and the normal pressure angle is \(20^{\circ}\). The pinion is mounted outboard of its bearings, and the gear is straddle-mounted. Based on the AGMA bending strength, what is the power rating of the gearset? Use \(K_0 = 1\) and \(S_F = S_H = 1\).