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### Torsion Spring Arc Length Formula and Calculator

**Manufacturing Processes and Design
Spring Design and Engineering **

**Torsion Spring Arc Length Formula and Calculator **

Arc Length of torsion spring formula;

*l*_{a} = *( π · r _{} · α ) / 180° *

*or*

*l*_{a} = *( π · d _{} · α ) / 360° *

Where:

*l*_{a} = arc length,

*r* = radius,

*D* = diameter

*α* = angle at center

References:

Mechanical and Metal Trades Handbook, 2nd Edition

2010

Ulrich Fischer, Roland Gomeringer, Max Heinzler, Roland Kilgus, Friedrich Naher, Stefan Oesterle, Heinz Paetzold, Andreas Stephan

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