A compression spring is to be made of 0.120-in.-diameter wire with 10 active coils, and 1-in. mean diameter of helix. Commercial limits for the wire diameter are 0.1185 and 0.1215 in. Helix diameter may vary from 0.980 to 1.020 in. The number of active coils may vary from 9 3/4 to 101/4.The modulus may vary from 11,400,000 to 11,800,000 psi. Find the spring rate when all variables tend to give the weakest spring. Find the spring rate when all variables tend to give the stiffest spring.
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