Allowance For Bending Sheet Metal

Most sheet metal materials will conform to the calculations.

Allowance for bending sheet metal.

Therefore the bend allowance added to the flange lengths is equal to the total flat length. When bends are made smaller than the required min. The material thickness will be measured in decimal form not by the gauge number. Radius metal will crack at the outside heel of the bend.

Calculating the bend allowance is necessary to create a finished product of the correct size. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length.

You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. Bend allowance is a measure of how much extra material is required to accommodate a bend in sheet metal. The most important considerations when bending metal is the min. We will start by calculating the bend allowance.

Radius of a bend is determined by the hardness and thickness of the metal. Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. From there we can calculate the k factor and the bend deduction. After bending the sheet we need to do some measurements as shown in figure 2.

Sheet metal calculator bend allowance equations and calculator. Bend allowances vary based on the angle of the bend the type and thickness of the material and the method used to create the bend. 90 degrees bend angle. This page also includes a link to a on line sheet metal bend allowance calculator.