John you have to take a look to the example of mmauldin it's a good one .
but I have a hint as I know that in tension springs the wire diameter must equal the pitch at it's original length and it's not in your model?..and also the radius of the helix is a constant and I think it would be the...
Sorry guys, I know that I'm bothering you ,but I have a question are those tamplate were drawing according to any standard or not, and if you have any standaard for the extension spring I'll be more than glad if you give me a feedback.Thank you :$
