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Setback
The horizontal distance from the bend tangent point to the bend line on the flat material. Setback is used when calculating back gauge position and is a function of the inside bend radius and material thickness.
Setback is the precise horizontal distance measured from the outside mold line (the intersection of the two outer surfaces of a bend) back to the bend line, and it is essential for calculating flat pattern dimensions on multi-bend parts. Knowing the setback allows engineers and press brake programmers to accurately locate bend lines on the flat blank so that the formed part matches the design dimensions.
The setback value depends on the bend radius, material thickness, and bend angle, for a 90-degree bend, setback equals the bend radius plus the material thickness. On parts with multiple bends, the cumulative effect of small setback errors can produce significant dimensional problems in the finished part, making accurate calculation critical.
CAD and press brake programming software automatically calculate setback based on the material parameters entered by the programmer, but experienced fabricators still verify these values against physical measurements on first articles.
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