In part one of this two-part blog series, we went over some of the basics and calculation methods for solid height within a compression spring. Referring to the point at which all the coils in a compression spring are fully compressed and cannot deflect further downward, the solid height of a given spring plays a major role in several areas of spring design, including the desired application for the spring.
At J and J Spring Enterprises, we offer a variety of custom springs to our clients, including coil springs, compression springs, torsion springs and many others. In today’s part two of our series, we’ll dig into a couple unique requests spring manufacturers may receive in terms of solid height on a compression spring, plus one major tip we always offer on spring design and the timing of this process compared to other elements of your project.
Higher Solid Height Point Desired
In certain cases, the designer or client in question will request a spring that has a higher-than-normal solid height point. There are a variety of practical applications where clients don’t want the spring to deflect very much at all before coils touch each other and reach solid height.
In such situations, the manufacturer’s first move will generally be adding additional dead coils at each end of the spring in question. Standard compression springs have a single dead coil on each end, one that’s wound to touch the coil nearest to it – this number can be increased, however, building up the solid height with each additional dead coil that’s added to the strand. Several such coils can be added in situations where the client wants very little deflection.
On the flip side, other clients may desire a spring that has much longer deflection points than normal, even past the solid height of a normal compression spring. In this case, the primary solution for most manufacturers is a cone-shaped spring, rather than a cylindrical one.
This allows for coils that close down inside of each other rather than contacting each other, meaning the solid height of this spring will technically equal the height of a single coil. This process may have an impact on other design parameters, but the spring itself can be made functionally in this way.
Spring Design Timing
Finally, a general tip on solid height and spring quality: Springs tend to be some of the last pieces designed in many projects, but if you have a chance to reverse this trend, we highly recommend it. Designing springs earlier allows there to be enough space in the overall device for the spring, which helps you avoid the need for more expensive alloys or other design qualities you may have to deal with down the line.
For more on solid height in compression springs, or to learn about any of our custom springs, speak to the staff at J and J Spring Enterprises.