Accurate and effective spring design can only be accomplished in today's
world using computer programs capable of running hundreds of simultaneous
calculations. Following are just a few of the most basic formulas for
getting a head start on compression spring design. Call us for design
assistance. We can run a thorough analysis and assist you in designing
the best spring for your application.
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Spring Engineering Constant
Calculate a spring constant from the spring's geometry and shear
modulus.
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Spring Engineering Geometry
Calculate pitch, rise angle and solid height.
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Spring Engineering Force and Stress
Calculate the maximum force a spring can take and the shear stress
with consideration to the Wahl correction factor.
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Spring Engineering Variables used in design formulas
| Spring wire diameter |
d |
| Spring outside diameter |
Douter |
| Mean diameter of spring |
D |
| Young's modulus of material |
E |
| Max force at solid |
Fmax |
| Shear modulus of material |
G |
| Free length |
Lfree |
| Wire length |
Lwire |
| Solid height |
Lsolid |
| Maximum displacement |
Ldef |
| Maximum load possible |
Lmax |
| Wahl correction factor |
W |
| Spring Constant |
k |
| Active coils |
na |
| Total coils |
nt |
| Density of material |
p |
| Poisson ratio of material |
v |
| Rise angle of spring coils |
θ |
| Maximum shear stress |
τmax |
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Spring Engineering and Manufacturing