# Bending allowances in sheet

Specifies the bend allowance for a specified material thickness at specific radii, and bend angles for the flat pattern analyzer. Note: All columns in the bend table must contain values. For decimal values, use the dot character (.) as a separator, not a comma. Access Browse to the Autodesk\Inventor [version]\Design Data\Bend Tables folder.

The bend radius of this new bend tool is 0.50 mm. Its bend angle is 45 degrees. Its associated allowance table is named "bend_form_allow". It is a preferred bend tool. The new bend tool is designed for a maximum material thickness of 2 mm.

Bend allowance is a measure of how much extra material is required to accommodate a bend in sheet metal. This is a function of the bend angle, Bend Radius, thickness of the material, and a variable called the K-factor. 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 Allowance Constants For Use In Sheet Metal Forming. ... The understanding of this behaviour is crucial for the correct calculation of the punch penetration and the bend allowance. The paper ...Bending is one of the most common sheet metal fabrication operations. Also known as press braking, flanging, die bending, folding and edging, this method is used to deform a material to an angular shape. This is done through the application of force on a workpiece. The force must exceed the material's yield strength to achieve a plastic deformation. In low carbon steel sheet metal, the minimum radius of a bend should be one- half the material thickness or 0.80 mm (0.03 inch), whichever is larger.  Bends specified as angles may be toleranced at plus or minus one-half degree at a location adjacent to the bends.The design calculations required for sheet metal blank development are referred to as a "bending allowance" calculation. Bend Radius Consideration The bend radius varies with the material thickness and the tooling used for bending the material, and each subcontractor will have their own tooling preference, meaning that different ...

The bend radii listed are standard minimum if manufacturing for aircraft and aerospace applications. 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.