Generally for extension springs, spring force = initial tension+k*(current length-original length)
And for compression springs, spring force = k*(current length-original length)
Adding initial tension option is not there in Pro-E & I've found that the difference between theoretical & Pro-E spring force is because of this component missing in Pro-E.
Note : Initial tension is the force which is holding the extension spring in the coiled position. and it can be calculated automatically using a simple formula
What has to be done to promote this idea & implement in the future version of Pro-E
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