2. Next, I need to figure how much force is required to make the door close. Lets assume the door weighs 90lbs, then the torsion springs formula is easy. I need the torsion spring to have at least 1in/lb of torque per 1 degree of radial movement. If I move 90 degree of movement I get 90 in/lb of torque. One must remember that all torsion springs have a rate force per 360 degree of movement. But in this example my rate would be 360in/lbs of torque. This gives me 1 in/lbs of torque per degree of movement. (Please keep in mind that the example above was purely hypothetical, in re
2. What is a safe design stress for a compression spring? This question doesn’t have a single simple answer. The answer depends greatly on the certain factors such as the type of spring wire used ( i.e. music wire, stainless steel, chrome-silicon, etc.), material grade (i.e. commercial vs. valve quality, standard or high strength, etc.) and the service environment (i.e. static vs. cyclic, corrosive atmosphere, very high or low temperatures, etc.).
Spring Wire: The spring wire material choices available for coil springs today work well for corrosion resistance, electrical conductivity, non-magnetic, and high temperature applications. Basic compression springs are normally music wire springs, music wire is a high carbon spring steel. It is important to remember which spring wire you choose for your compression spring design application. Choosing the right spring wire for your spring will greatly enhance the life and repeatability of your spring, as well as give you many years of service life. To see the properties of common spring materia
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