Solved: Design an infinite-life helical coil extension
Chapter 10, Problem 10-37(choose chapter or problem)
Design an infinite-life helical coil extension spring with full end loops and generous loop-bend radii for a minimum load of 9 lbf and a maximum load of 18 lbf, with an accompanying stretch of \(\frac{1}{4}\) in. The spring is for food-service equipment and must be stainless steel. The outside diameter of the coil cannot exceed 1 in, and the free length cannot exceed \(2 \frac{1}{2}\) in. Using a fatigue design factor of \(n_f = 2\), complete the design. Use the Gerber criterion with Table 10–8.
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