Choose the Right Spring: A Practical Engineering Guide

Start by defining the motion and force. Is the spring pushing, pulling, or resisting rotation? Compression springs push, extension springs pull, torsion springs provide torque. This single question eliminates half the options.

Next, measure your space envelope. A compression spring needs length to coil; if that length is unavailable, a disc or wave spring can fit in a shorter stack. If radial space is limited, opt for a longer spring with a smaller diameter.

Then consider the load-deflection curve. Coil springs have a linear rate, which is ideal for most mechanisms. If you need a constant force over a long travel, use a constant force spring. For high loads in a tight spot, stack Belleville washers to tune the rate.

Finally, think about environment and fatigue. High temperatures or corrosive media demand special alloys like Inconel or stainless. High cycle counts require shot-peening and good surface finish. Always prototype and test under real conditions before finalizing.

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