Spring Design

Design information for engineers, such as spring calculation formulas,

which are the basis of spring design, can be found here.

Flat Spiral

As an example, calculate the torque and stress in the following case using the values as follows.
E:2.06×105  (N/mm2) b:10 (mm)
t:1.0 (mm) l:1200 (mm)
In the case of the values above, the spring constant k can be calculated using the following formula.

Therefore, the torque delivered (M) per turn (360°) is expressed by the following formula, where 360° is represented as 2π.

Stress at that point is as the following formula.

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