The shaft shown in the figure is proposed for the application defined in Prob. 3€“73, p. 138. 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 ofsafety.

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Gear center Gear center 400 350 300 75 40 50 42 30 30 -30 30 385 425 325 1080