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Newcomb round-wire torsion-spring basic model

Newcomb round-wire basic formula uses empirical constant10.8 and deflection in revolutions; degree input is divided by360. Linear-elastic spring-body approximation excluding arm flexibility, curvature stress concentration, hysteresis, buckling, fatigue and allowable stress checks. Not a safe-load approval or garage-door spring selection/tensioning guide. Input limits do not establish allowable deflection.

Newcomb round-wire basic formula uses empirical constant10.8 and deflection in revolutions; degree input is divided by360. Linear-elastic spring-body approximation excluding arm flexibility, curvature stress concentration, hysteresis, buckling, fatigue and allowable stress checks. Not a safe-load approval or garage-door spring selection/tensioning guide. Input limits do not establish allowable deflection.

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Result

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How to use this tool

Check the units, enter your values, and run the tool. Results follow the assumptions and method below.

Calculation method

Basic spring rate per degreeyoung*wire^4/(10.8*coils*meanDiameter*360)
Basic-model torqueyoung*wire^4/(10.8*coils*meanDiameter*360)*angle
Nominal bending stress before curvature correction32*(young*wire^4/(10.8*coils*meanDiameter*360))*angle/(pi*wire^3)
Unloaded inside diametermeanDiameter-wire
Unloaded outside diametermeanDiameter+wire

References