Bend Deduction Sheet Metal

Should be subtracted from the flat pattern so the formed part arrives at the desired dimensions.

Bend deduction sheet metal.

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. The bend deduction is the amount the sheet metal will stretch when bent as measured from the outside edges of the bend. You only have to insert interior angle flange lengths k factor inside radius and material thickness. Bend deductions are the first and more critical aspects when working with fabricated sheet metal.

The u punch forms a u shape with a single punch. 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. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. If missed it will wreak havoc on your formed parts done well and you ll have a precise measurement you and your clients will be happy with.

The bend radius refers to the inside radius. 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. As this happens you gain a small amount of total length in your part.

The bend deduction of means that the material is expected to stretch by that amount during the course of bending. The material thickness will be measured in decimal form not by the gauge number. This is simulated on the part shown above by the section shown in red.