A helical compression spring is to be made with given wire diameter, outside diameter, and number of active coils. The least expensive steel spring wire is to be used, and presetting will not be used. Assume both end plates are in contact with nearly a full turn of wire and that the end plate loads coincide with the spring axis. a. Estimate the maximum static load that can be applied without encountering more than 2% long-term set.
b. What is the spring rate?
c. What should be the free-length in order that the spring becomes solid when load determined in (a) is applied?
d. Would buckling problems be encountered if one end plate is free to tilt?