A helical compression spring with squared and ground ends is

A helical compression spring with squared and ground ends is required to exert a force of 60.0 Ibf at a length that cannot exceed 2.5 inch, and 105.0 Ibf at a length that is 0.5 inch shorter. This spring must fit inside a 1.5 inch diameter. Loading is static, and yielding should not occur when the spring is set to a solid height. The clash allowance should be 10% of the total working deflection. Use music wire ASTM # A228 for the spring material. Calculate the force required to bring the spring to the solid height, in Ibf.

Solution

Force required to bring the spring to the solid height is

F = 105-60

F = 45 lbf