Allowance For Bending Sheet Metal

The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length.

Allowance for bending sheet metal.

Calculating the bend allowance is necessary to create a finished product of the correct size. Sheet metal calculator bend allowance equations and calculator. Radius metal will crack at the outside heel of the bend. The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance.

The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend. From there we can calculate the k factor and the bend deduction. Bend allowance is the amount of metal to be added to the total layout. The most important considerations when bending metal is the min.

The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. Radius of a bend is determined by the hardness and thickness of the metal. Therefore the bend allowance added to the flange lengths is equal to the total flat length. 90 degrees bend angle.

We will start by calculating the bend allowance. This is a function of the bend angle bend radius thickness of the material and a variable called the k factor. When bends are made smaller than the required min. This page also includes a link to a on line sheet metal bend allowance calculator.

Bend allowance is a measure of how much extra material is required to accommodate a bend in sheet metal. The material thickness will be measured in decimal form not by the gauge number. Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. Most sheet metal materials will conform to the calculations.