![]() ![]() arc length.Īssuming 2 degrees per bend, I need 15 bumps to achieve a 30-degree external angle (30/2 = 15). Plugging in the numbers, I get a 16.613-in. ![]() I’m having trouble applying the equations you spell out in your book: arc length of inner radius = 2πr × (degrees of bend angle/360), with r equaling the bump-formed inside radius. I need to bump-form 0.125-in.-thick material to a 30-degree angle (as measured from outside of the bend) with a 26-in. I have a question on bump radius bending, which you cover in Chapter 44, specifically regarding the formula you use for the approximate depth of penetration into the workpiece. Question: I recently purchased a copy of your book, Bending Basics. And when it comes to predicting the inside bend radius in air forming, different material from different suppliers can lead to very different results. ![]() Regarding the bump bend, what works for gauge material might not work for plate. This month we delve into the intricacies of bump bending and go back to basics with air forming, reviewing the relationship between the die opening, the inside bend radius, and the material thickness.īoth topics reveal how subtle and complex bending can be. ![]()
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