All three are usually used to create stiffeners to strengthen a flange or bend or used for safety or cosmetic reasons. The three remaining are flat (also called flattened or closed) hem, the teardrop, and the open hem. It’s not that a “Pittsburgh” or “double lap seams” didn’t work they did and, in some cases, are still used. While those in the sheet metal trade form dozens of different kinds of hems and seams, most are simply outdated, and only three are in general use. How do I calculate the bend lines on something like this? What radius do I use? What K-factor do I use?Īnswer: Let’s begin by looking at the hem. We make the hem, and then we bend across the double material thickness. We have two scenarios: 14-gauge hot-rolled pickled and oiled (HP&O) and galvanized, and 12-gauge HP&O and galvanized. Question: We have a customer that is requiring us to bend a hem (see Figure 1 ). The reader’s operation bends the closed hem first, then makes the 90-degree bend over two material thicknesses.
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