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Rate Testing — Removing the Mystery of Preload

Testing the Rate of compression springs is one of the more common activities for spring houses. Spring Rate is the force created when a spring is deflected an inch. It is, therefore, the basic determinant of all loads at any height. The load created with a given...

More Trickery — Lowering Spring Rate

In the Fall 2009 issue, we discussed spring rate and how rate can be increased with a manipulation of pitch. The practice of placing some coils of a helical compression spring closer than others, to increase rate, is a fairly common practice in the industry. But, what...

Spring Trickery… With Nothing Up My Sleeve

One of the desired functions of a compression spring is that it stays linear during its deflection. In layman’s terms, this means that the spring should produce the same load for every inch it moves. If a spring has a rate of 10 #/in, it will deliver 10 lbs for every...

Simple Devices, Big Problem Solvers

One day, I was talking to a new customer on the phone. As I started asking him questions on the specifics of the spring he needed, I could tell he was getting a bit frustrated with all the questions. He’d finally had enough and stated, “It’s only a bendy piece of...

Sweat the Small Stuff

I started my career in the spring business pressing springs and operating several stress relief ovens. I worked another 13 years doing just about everything there was to do, including an eight year stint in a hot coil plant. After I changed employers to seek work in...

Square and Rectangular Wire — The Good, The Bad, and…

I have had many discussions in this column about the attributes of non-round wire shapes. Virtually every type of spring design has been formed from square or rectangular material. And, the basic question is: “Why?” What do I gain or lose from using shaped wire?...
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