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How to calculate your spring rate


simonr
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Thought this migt be useful to you.

The spring rate = (1406250 x d x d x d x d) / (N x D x D x D)

d = wire diameter in inches

N = Number of active coils.

The flattened coils at the ends are not considered active.

D = Mean diameter of spring.

Half way between the inside & outside diameter.

I've tried it for a few odd springs and it generally comes within 10% of what the manufacturer reckons it's supposed to be.

Si

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