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In sheet metal bending, bend deduction refers to the mathematical calculation used to determine the total length of the flat pattern before bending. When the sheet metal is bent, it undergoes compressive and tensile forces, resulting in changes to its overall length. Bend deduction helps compensate for these changes and ensures that the final bent piece matches the desired dimensions.
Bend Deduction is typically used when converting a 3D file to a unfolded 2D.