If you need to take the bend further increase the pressure again. However when you need to stop the bend to check the angle KEEP THE BENDER ARMS UNDER PRESSURE without further actuating the bend. With custom rolled pipe, material on the outside of the bend stretches this causes wall thinning. Thicker pipe walls can withstand higher compressive forces on the inside of a bend without distorting or wrinkling. i tried a steel shim on top of the aluminium former to advance the bend fulcrum with mixed results.Įventually i found what appears to be the answer and that is keeping a constant pressure whiles bending: relax the force on the arms for a second whilest bending and you'll end up with crinkles in the copper. Ripples are caused by high levels of compressive force on the inside of a pipe or tube with thin wall thickness. I have a really cheep 15 + 22mm pipe bender that would sometimes make perfect bends and at other times would make crinkled ones. ![]() The outside wall of the tube collapses and thins out, and the inside of the tube compresses and wrinkles. ![]() I have noticed many articles on various forums over the years discussing the extremely annoying occurance of crinkling when bending copper pipe with a pipe bender. The Basics When a tube is bent, basically two things happen.
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