Question: The shaft shown in Problem 724 is proposed for the application defined in Problem 3-83. Specify a square key for gear B, using a factor

The shaft shown in Problem 7–24 is proposed for the application defined in Problem 3-83. Specify a square key for gear B, using a factor of safety of 1.1.

Data in Problem 7–24

The shaft shown in the figure is proposed for the application defined in Problem 3- 83. The material is AISI 1018 cold-drawn steel. The gears seat against the shoulders, and have hubs with setscrews to lock them in place. The effective centers of the gears for force transmission are shown. The keyseats are cut with standard endmills. The bearings are press-fit against the shoulders. Determine the minimum fatigue factor of safety using the DE-Gerber fatigue criterion.

0.5 1.00 1.3 16 15 17 Gear center 1.75 2.5 14 1.75

0.5 1.00 1.3 16 15 17 Gear center 1.75 2.5 14 1.75 1.3 Gear center 2 1.00

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