On 03 Aug 2003 20:40:01 GMT, a (Dave Baker) wrote
something
.......and in reply I say!:


PMFJI.

Can you parethn....pra... you know, put brackets in your formula? G
I tried applying it various ways and got crazy answers.

And do you mean dims in mm, but answer in lb/inch?

Thanks in advance.

With dimensions in mm.

Spring diameter (D) = mean diameter i.e. o/d minus wire thickness (or i/d plus
wire thickness of course)

Number of working coils (N) = fully compressed length divided by wire diameter
minus a further 1.7 (to allow for dead coils at each end)

(d) = Wire diameter

Spring rate in pounds/inch is

d^4 / D^3 / N * 60,000


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