However, the amount of error incurred is so slight that, for most work, assuming it is at the center is satisfactory. For calculation purposes, it is often assumed that the neutral axis is located at the center of the material, although the neutral axis is not exactly in the center of the material. This thinning of the bend area moves the neutral line of the metal in towards the radius center. After bending, the bend area is 10 to 15 percent thinner than before bending. Neutral axis-an imaginary line that has the same length after bending as it had before bending. All the space between the band tangent lines is the bend allowance. Minimum bend radius charts can be found in manufacturer’s maintenance manuals.īend tangent line (BL)-the location at which the metal starts to bend and the line at which the metal stops curving. Always use a Minimum Bend Radius Table to determine the minimum bend radius for the alloy that is going to be used. The minimum bend radius depends on the temper, thickness, and type of material. The bend radius is measured from a radius center to the inside surface of the metal. The bend allowance may be considered as being the length of the curved portion of the neutral line.īend radius-the arc is formed when sheet metal is bent. Bend allowance (BA)-refers to the curved section of metal within the bend (the portion of metal that is curved in bending).
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