The bend allowance formula takes into account the geometries of bending and the properties of your metal to determine the bend allowance.
Aluminum sheet metal bend radius chart.
The tables below show bend radii and minimum bend sizes for materials and tooling combinations stocked by protocase.
Use the minimum bend dimension values in the charts below for your minimum closeness of cutout to a bend.
The bend radius you select may not be available if the geometry of the part will not allow us to bend with the specific tooling required to achieve that radius.
Material bend radii and minimum bend size charts please note.
It is possible to choose other bends if you require but additional lead time and tooling charges may apply.
You will need to know your material thickness mt the bend angle b the inside radius ir and the k factor k.
We go beyond the general rules of sheet metal bending as our customers want tight bend radii for sheet metal parts.
The material thickness will be measured in decimal form not by the gauge number.
Table 1 preferred recommended 90 degree bend radii for various sheet metals.
Radii for various thicknesses expressed in terms of thickness t.
Since commercial sheet metal bending can be done with less concern for stresses caused during forming operation the radius can be near zero for thin sheet metal.
Per the aluminum association inc.
The bend radii listed are standard minimum if manufacturing for aircraft and aerospace applications.