Even though bottoming has been losing favor over the last 20 to 30 years, the bending method still permeates our thinking when we bend sheet metal. Bottoming and Air Formingįrom the advent of the powered press brake in the 1920s to the present day, operators have formed parts with bottom bending, or bottoming. To solve this problem, we’ll start with the root cause-that is, the two methods of forming and the lack of knowledge about the differences between them. ![]() This is a misunderstanding that both engineering and the shop floor must deal with. But how does the operator know to use the 0.5-in.-radius punch if the print calls for a bend radius of 0.6 in.?Ī: You have hit upon one of the biggest issues facing the sheet metal industry. die opening by 15% (for steel), I get 0.6 in. Now, if I use the 20% rule and multiply the 4-in. For these parts, we use a punch with a 0.5-in. For example, we are currently having some issues with some parts made from 0.5-in.-thick A36 steel. Q: I’ve been struggling to understand how the bend radius on a print (which I specify) correlates to tool selection. ![]() ZhakYaroslavPhoto/iStock/Getty Images Plus
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