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metal spring technology

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Jbird | 20:29 Fri 25th Apr 2008 | How it Works
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hello all, can any one advise me please on how to calculate the following; I want a torsion spring that has closed to open length of 350mm and i expect that the force that will be exerted to open it will be about 150lbs, what i am after is what is the relation ship between energy used and energy returned , also how does one go about looking for a hard spring or a soft spring and there for how would this effect the length of the spring ? a rudermentry or rule of thum answer if possible
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