Allowance For Bending Sheet Metal

When bends are made smaller than the required min.

Allowance for bending sheet metal. After bending the sheet we need to do some measurements as shown in figure 2. The following illustration shows the equation calculation for determining the bend allowance when forming sheet metal. Bend allowance is the amount of metal to be added to the total layout. 90 degrees bend angle.

Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees. The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance. From there we can calculate the k factor and the bend deduction. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.

You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k. Radius of a bend is determined by the hardness and thickness of the metal. This is a function of the bend angle bend radius thickness of the material and a variable called the k factor. Bend allowance is a measure of how much extra material is required to accommodate a bend in sheet metal.

Sheet metal calculator bend allowance equations and calculator. 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. This page also includes a link to a on line sheet metal bend allowance calculator.

Radius metal will crack at the outside heel of the bend. Most sheet metal materials will conform to the calculations. Calculating the bend allowance is necessary to create a finished product of the correct size. The material thickness will be measured in decimal form not by the gauge number.