Spring Diameter

Written by Jerry Ratzlaff on . Posted in Fastener

spring compression 11formulas that use Spring Diameter

\(\large{ D = D_o - d  }\)   
\(\large{ D = D_i + d  }\)   
\(\large{ D_i = D_o - 2 \; d  }\)  
\(\large{ D_o = D_i + 2 \; d  }\)  
\(\large{ D_o = \sqrt{ D^2 + \frac{ p^2 \;-\; d^2 }{ \pi^2 }  }  + d   }\)  (When a spring is compressed there is a small increase in \(D_o\).  When a spring tolerance is required, this formula will give you the increase in \(D_o\).) 

Where:

\(\large{ D }\) = mean coil diameter

\(\large{ D_i }\) = inside diameter

\(\large{ D_o }\) = outside diameter

\(\large{ \pi }\) = Pi

\(\large{ p }\) = pitch

\(\large{ d }\) = wire diameter

 

Tags: Equations for Spring