Originally Posted by
rick130
OK, dug my notes out and you reduce the number of coils by 1.75 when calculating for closed and ground ends.
The formula I've used is
K=Gd4/64R3N
The 4 after the d and 3 after the R are to the power of
where
K= spring rate in lb/in
G= modulous of rigidity (1500000 works well in my calcs)
d= wire diameter in inches
R= mean radius of coil
N= number of active coils
For closed and ground ends, reduce coil wind number by 1.75 to get the number of active coils.
plain ends you reduce by 0.5
plain ends ground reduce by 1.0
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