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SOLVED:Given the following data for a helical torsion spring loaded in fatigue, find the spring index, unloaded coil dia, minimum loaded coil dia, and safety factor in fatigue. State all assumptions and sources of empirical data used. Deflection at assembly =0.25 rev, working deflection =0.5 rev, k=60 lb-in / rev, Na=20,0.192 in music wire, unpeened.

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