Although it is an option for calculating a bend in some CAD programs such as Solid Works, it is not often referred to in the actual manufacturing process since it is a theoretical number and cannot be verified in a physical part. Lets rapidly run through them so that you can stay assured that your bending allowance formula remains protected as you fill it out. In the example above, it is indicated by a dashed blue line. ![]() The bend allowance is the amount of the neutral axis that bends. So if you add up the flat length of all the flanges and add one Bend Allowance for each. So the flat pattern length is 2 + 3 + 0.2201 which is equal to 5.2201. If you don’t have a calculator handy, try the Bend Calculator. Any inaccuracy in calculating the bend-allowance parameter. Plugging in our numbers, we have: Bend Allowance 90 (PI / 180) (0.125 + 0.42 0.036) 0.2200999813105009. Because a bend deduction can be measured in a physical part, it is the most accurate way to calculate a material's stretch. Bend allowance is defined as the length of the unstretched fiber in the bent portion of the sheet. " should be subtracted from the flat pattern so the formed part arrives at the desired dimensions. This is simulated on the part shown above by the section shown in red. The bend deduction of " means that the material is expected to stretch by that amount during the course of bending.
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