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Tool Talk Discussion Forum

Formula

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vapor

06-16-2005 21:03:25




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If we had all of the information the formula is:

(GddddF/8NDDD)

G=Modulus of elasticity of material in torsion (psi)
d=diameter of wire (inches)
F=deflection of active coils (inches)
N=number of active coils
D=mean coil diameter (OD-d)




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vapor

06-16-2005 21:36:24




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 Re: Formula in reply to vapor, 06-16-2005 21:03:25  
Made some assumptions on your spring and did the calculation. There isn't that much difference in the torsional modulus of different steels. The spring rate is:

18.09/N pounds for every 1/4" of compression. N is the number of active coils. This is the number of turns not counting the flat ground parts (doesn't have to be a whole number). For example, if you counted 5.5 turns, then the force would be 3.28 lbs of force for every 1/4" of compression.

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Bob724

06-17-2005 15:06:12




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 Re: Formula in reply to vapor, 06-16-2005 21:36:24  
NC Wayne and Vapor thank you for the information and going to all the trouble to figure that out. I didn't know it would be that complicated. I'll try adding the weight and see what happens. Thank you again.



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