Calculator
for cone compression springs 

Diameter of spring wire d 
10^{3} m 
Mean coil diameter 2r_{1} 
10^{3} m 
Mean coil diameter 2r_{0} 
10^{3} m 
Number of active coils n 
 
Shear modulus G = E / ( 2 ( 1+v ) ) 
10^{9}
Pa 
Spring force F 
N 

Spring length closed Lc = n d 
10^{3} m 
Spring deflection f 
10^{3} m 
Spring stiffness k = dF / df = F / f 
10^{3}
N/m 
Spring length free L0 > Lc + f 
10^{3}
N/m 
Pitch of lead s = L0 / n 
10^{3}
m 
Shear stress τ 
10^{6}
Pa 

www.tribologyabc.com 



