Calculating Bend Allowance For Sheet Metal

Most sheet metal materials will conform to the calculations.

Calculating bend allowance for sheet metal.

To calculate r which is the radius of the arc on the neutral axis we can use the following equation. Where ba is bending allowance. Radius metal will crack at the outside heel of the bend. To calculate the neutral axis distance from the inner face t we can subtract inside bend radius from r.

The most important considerations when bending metal is the min. Now that we have both leg length 1 and 2 we can use the following equation again to calculate the bend allowance. Most sheet metal materials will conform to the calculations. If you have a sheet metal bending product as shown in above picture with two legs of length x and y and you unbend it you will see that total length of the unbend sheet will not x y rather the length will be x y ba.

Sheet metal calculator bend allowance equations and calculator. The material thickness will be measured in decimal form not by the gauge number. And by having t and the sheet thickness t we can calculate the k factor as follow. This page also includes a link to a on line sheet metal bend allowance calculator.

Therefore the bend allowance added to the flange lengths is equal to the total flat length. A is the bending angle in the above equation so. 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 the amount of metal to be added to the total layout.

The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. Sheet metal bend allowance calculator determines the bend allowance amount of metal to be added to the total layout when forming sheet metal. When bends are made smaller than the required min. The bend allowance describes the length of the neutral axis between the bend lines or in other words the arc length of the bend.