Although it is an option for calculating a bend in some CAD programs such as Solid Works, it is not often referred to in the actual manufacturing process since it is a theoretical number and cannot be verified in a physical part. In the example above, it is indicated by a dashed blue line. The bend allowance is the amount of the neutral axis that bends. Because a bend deduction can be measured in a physical part, it is the most accurate way to calculate a material's stretch. The image below shows the close relation between Bend Deduction and Bend Allowance. " should be subtracted from the flat pattern so the formed part arrives at the desired dimensions. In order to develop the flat pattern, we will subtract. This is simulated on the part shown above by the section shown in red. The bend deduction of " means that the material is expected to stretch by that amount during the course of bending.
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