Bend Allowance Table For Sheet Metal

Table 1 preferred recommended 90 degree bend radii for various sheet metals.

Bend allowance table for sheet metal.

When making bends it takes material specifications into account. The bend table approach is probably the most accurate approach for calculating bend allowance. The bend allowance bend deduction of the sheet metal specified in k factor by configuring and utilizing a sheet metal gauge table we can speed up the process of selecting the correct wall thickness based on gauge value and selecting the correct bend radius based on available tooling we can also automate the process of selecting the. It exists for a reason.

Bend allowance and k factor. V die width is 6 8 times the plate thickness none 90 bend 180 angle 90 deduction the deduction is 1 8 times the steel plate thickness and 1 6 times the aluminum plate. The material thickness will be measured in decimal form not by the gauge number. You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k.

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. When the sheet metal is put through the process of bending the metal around the bend is deformed and stretched. After bending the sheet we need to do some measurements as shown in figure 2.

We will start by calculating the bend allowance. The value of the bend allowance that comes from sheet metal suppliers and manufactures as well as engineering textbooks are provided in bend tables and bend table looks pretty much like the following excel spreadsheet. The bend allowance and bend deduction are two measures that relate the bent length of a piece of sheet metal to the flat length. None 90 bend unfold according to the neutral layer the distance from neutral to sheet inner side is t 3 inner r can refer to the above chart.

From there we can calculate the k factor and the bend deduction. Figure 2 illustrates the sheet that is bent with the bend angle of 90 degrees.