Torsion Spring Rate Calculation Example:

Formula:

Rate Per 360 degrees = Ed^4 / 10.8 DN

Spring Parameters

d = 0.035 inches

OD = 0.500 inches

D = 0.465 inches

N = 3 coils

Wire Type = Music Wire

E For Music Wire = 30 x 10^6

Example:

Rate Per 360 Degrees = (30 x 10^6) (0.035^4) / 10.8 (0.465)(3)

Rate Per 360 Degrees = 45.01875 / 15.066

Rate Per 360 Degrees = 2.988 pounds / 360 degrees

To determine your rate per degree divide the above answer by 360

Rate Per Degree = Rate Per 360 Degrees / 360

Rate Per Degree = 2.988 / 360

Rate Per Degree = 0.0083 pounds / degree