An uncrowned straight-bevel pinion has 30 teeth, a

Chapter 15, Problem 15.3

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An uncrowned straight-bevel pinion has 30 teeth, a diametral pitch of 6, and a transmission accuracy number of 6. The driven gear has 60 teeth. Both are made of No. 30 cast iron. The shaft angle is 90. The face width is 1.25 in, the pinion speed is 900 rev/min, and the normal pressure angle is 20. The pinion is mounted outboard of its bearings and the bearings of the gear straddle it. What is the power rating based on AGMA bending strength? Note: For cast iron gearsets reliability information has not yet been developed. We say that if the life is greater than 107 revolutions, then set KL 5 1, CL 5 1, CR 5 1, KR 5 1, and apply a factor of safety. Use SF 5 2 and SH 5 12.

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