The flat length is the total of the flat portion of both flanges plus the length through the arc of the bend area. The material thickness is 0.036”, the inside radius is 0.125”, and the angle of bend is 90 degrees. The picture shows that the legs of the bracket are 2” and 3”. Oh, and yes, you do need to know the K-factor to calculate the Bend Allowance. Although you may find several different formulas that claim to calculate the Bend Allowance they usually are the same formula, only simplified by filling in the angle or a K-factor. Well, now those experts have retired and it’s time for a new generation to learn the right way to do the calculate the correct flat pattern layout.Ĭalculating the flat pattern length from the 3D part really isn’t that difficult. They only taught the new apprentice how to apply the results shown on the cheat sheet, not how to calculate the numbers. Years ago, the real experts created cheat sheets and tacked them to the wall. Yet, many CAD and CNC programmers have no idea how to calculate the required values. Calculating the correct flat pattern layout is crucial to getting a good quality finished part from your press brake.
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