A helical coil compression spring is needed for food service machinery. The load varies from a minimum of 4 lbf to a maximum of 18 lbf. The spring rate k is to be 9.5 lbf/in. The outside diameter of the spring cannot exceed 2 1/2 in. The spring maker has available suitable dies for drawing 0.080-, 0.0915-, 0.1055-, and XXXXXXXXXXin-diameter wire. Using a fatigue design factor nf  of 1.5, and the Gerber-Zimmerli fatigue-failure criterion, design a suitable spring.
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