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Spring rate is the change in load per unit of deflection and may be determined using the following procedure:
1. Deflect* the spring approximated 20% of the available deflection and measure the load (P1) and the height (L1).
2. Deflect* the spring approximately 80% of the available deflection and measure the load (P2) and the height (L2).
3. Calculate the rate (lbs/inch) or (N/mm) by using the following formula:
(P2 - P1) / (L1 - L2)
where R = Rate, P = Load,
L = Load Length
*To deflect a spring one would apply or remove an external load, causing the spring ends/arms to move.
Please contact the Newcomb Spring facility nearest you for more information on spring rate and other considerations of spring design. Newcomb Spring also offers a special technical guide on CD that includes an animated glossary and information on spring characteristics. To request one of our technical cds, visit our contact page (please write that you are requesting a CD in the Notes field).
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