A steel helical spring of the most efficient design must carry a load of 2.5 lb after being released 0.10 in. from its most compressed condition, where the maximum shearing stress is 60,000 psi. For a tentative value for c of 6, find a suitable standard wire diameter, the exact value for c, and the number of active coils. Compare the results with those of Problem 1.
Problem 1
A steel helical compression spring must exert a force of 2.5 lb after being released 0.10 in. from its most highly compressed condition. No. 19 wire is used with a spring index of 6. Find the static loading for a maximum stress of 60,000 psi. Find the number of active coils.
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