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Old 07-10-2014, 11:53 AM  
Wuzzat?
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If I had a garage and if I had this problem I'd make a portable spring testing jig to take to the store.

Then, I'd preload the candidate spring 1/4th of a turn and then measure the torque to get to the next 1/4th turn, so by now the spring is twisted 1/2 turn. Subtract the two lb-ft values and scale up from there.

The Web is full of advice on this subject and one link had a calculator that works for their spring inventory and a 4" drum diameter.
A drum with more than one diameter is little messier to figure.

The more numbers you have, the more measurements you take, the sooner you will know if your current strategy for this project will likely work out.



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Old 07-10-2014, 12:12 PM  
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Sorry, but the calculations have made me dizzy!



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Old 07-10-2014, 12:29 PM  
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Quote:
Originally Posted by havasu View Post
Sorry, but the calculations have made me dizzy!
The next stage is that your brain explodes. . .
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Old 07-10-2014, 01:47 PM  
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I just went to my local OHD and told him what I had and that I install after factory insulation. Ended up upgrading to a double spring for only $15 more than a one spring application. I also inquired about my making my own cable and they said that's how they make theirs only they have a crimping tool versus a hammer.

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Old 07-10-2014, 08:36 PM  
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Skinny cable is pretty strong, page 2 of

http://www.stormcable.com/uploads/Tensile_load_support_for_cable.pdf

For personal safety, this cable including its end terminations should be at least 10x stronger than its normal load of 100 or 200 lbs.



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