Bend Deduction Sheet Metal

The material thickness will be measured in decimal form not by the gauge number.

Bend deduction sheet metal.

Bend deductions are the first and more critical aspects when working with fabricated sheet metal. Understanding the bend allowance and consequently the bend deduction of a part is a crucial first step to understanding how sheet metal parts are fabricated. The formed bend radius is dependent upon the dies used the material properties and the material thickness. The bend deduction formula takes into account the geometries of bending and the properties of your metal to determine the bend deduction.

As this happens you gain a small amount of total length in your part. The u punch forms a u shape with a single punch. The bend radius refers to the inside radius. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k.

Cells on the right will output the desired values. When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched. Sheet metal bend deduction chart pdf sheet metal bend deduction chart excel conclusion. The bend deduction of means that the material is expected to stretch by that amount during the course of bending.

With this free online tool we quickly get the sheet metal bend deduction and therefore the sheet metal blank initial flat length from the finished part measurements. This is simulated on the part shown above by the section shown in red. The bend deduction is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend.