Summary
Bend allowance is the length of the neutral axis of a bent part
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and is calculated as BA = angle × (radius + K-factor × thickness).
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The K-factor or stretch factor of the material
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and the angle
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can be in radians or degrees, depending on the formula. The bend allowance is the amount of metal to be added to the total layout
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and is equal to the difference between the unfolded length (L) and the sum of the flange lengths (L1 and L2).
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According to
