hello! Could anyone give some information about how to calculate a garter spring? Or how to, given a spring, calculate the radial force it makes if it is used like a garter spring? I have been looking for some info but i couldnt find anything at all... Thanks in advance

You need to know the rate of the spring, probably provided by manufacture. To determine your rate yourself, please see the following example: Example: You have a 10.000-inch outer diameter and you need to open up the garter spring to an 11.000 diameter thus giving you 1.000 inch of radial travel. At this 11.000-inch diameter you require 50 lbs of force for your garter spring to function correctly in your product. The formula to determine rate for a garter spring is: 50 lbs divided by Pie (3.14) = 15.923 lbs (your rate / inch)You need a 15.923 lbs/per inch extension spring to do the job. The 50 lbs is your load at an 11.000 diameter or 1 inch of radial expansion but the 15.923 lb rate, which is the master in determining the load at other distances.