Acompression spring is needed to fit over a 0.5-in diameter rod. to allow for some clearance, the inside diameter of the spring is to be 0.6 in. to ensure a reasonable coil, use a spring index of 10. the spring is to be used in a machine by compressing it from a free length of 5 in through a stroke of 3 in to its solid length. the spring should have squared and ground ends, unpeened, and is to be made from cold-drawn wire.

(a) determine a suitable wire diameter.
(b) determine a suitable total number of coils.
(c) determine the spring constant.
(d) determine the static factor of safety when compressed to solid length.
(e) determine the fatigue factor of safety when repeatedly cycled from free length to solid length, using the gerber fatigue failure criterion with zimmerli data.