Allowance For Bending Sheet Metal

You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k.

Allowance for bending sheet metal. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. The material thickness will be measured in decimal form not by the gauge number. Most sheet metal materials will conform to the calculations. Sheet metal calculator bend allowance equations and calculator.

We will start by calculating the bend allowance. When bends are made smaller than the required min. After bending the sheet we need to do some measurements as shown in figure 2. Radius of a bend is determined by the hardness and thickness of the metal.

This page also includes a link to a on line sheet metal bend allowance calculator. 90 degrees bend angle. Therefore the bend allowance added to the flange lengths is equal to the total flat length. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length.

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 bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance. The most important considerations when bending metal is the min.

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. Radius metal will crack at the outside heel of the bend. Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. Calculating the bend allowance is necessary to create a finished product of the correct size.