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The Water Cooler
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A little metal fabrication project
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<blockquote data-quote="DPI" data-source="post: 2012215" data-attributes="member: 793"><p>The jd2 model 4 is a rotary draw bender, I do not use it as a mandrel bender. I think to say mandrel, something like a steel ball, plug or sand has to be in the tube to help stop deformation. I believe the type you have and I have used before is called a press bender.</p><p></p><p>From WIKI</p><p><strong>Press Bender:</strong>Probably will be the first bending process used on cold pipes and tubing. In this process a die in the shape of the bend is pressed against the pipe forcing the pipe to fit the shape of the bend. Because the pipe is not supported internally there is some deformation of the shape of the pipe giving an ovular cross section. This process is used where a consistent cross section of the pipe is not required. Although a single die can produce various shapes, it only works for one size tube and radius.</p><p><strong></strong></p><p><strong>Rotary Draw:</strong>Rotary draw bending (RDB) is a precise technology, since it bends using tooling or "die sets" which have a constant center line radius (CLR), alternatively indicated as Mean Bending Radius (Rm). Often a positioning index table (IDX) is attached to the bender allowing the operator to reproduce complex bends which can have multiple bends and differing planes. Rotary draw benders are the most popular machines for use in bending tube, pipe and solids for applications like: handrails, frames, motor vehicle roll cages, handles, lines and much more.</p><p></p><p>Here's the stock pic of the JD2 Model 4 I use.</p><p><img src="https://www.okshooters.com/data/MetaMirrorCache/www.jd2.com_images_Product_large_M4_20Bender_20Feature.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="DPI, post: 2012215, member: 793"] The jd2 model 4 is a rotary draw bender, I do not use it as a mandrel bender. I think to say mandrel, something like a steel ball, plug or sand has to be in the tube to help stop deformation. I believe the type you have and I have used before is called a press bender. From WIKI [B]Press Bender:[/B]Probably will be the first bending process used on cold pipes and tubing. In this process a die in the shape of the bend is pressed against the pipe forcing the pipe to fit the shape of the bend. Because the pipe is not supported internally there is some deformation of the shape of the pipe giving an ovular cross section. This process is used where a consistent cross section of the pipe is not required. Although a single die can produce various shapes, it only works for one size tube and radius. [B] Rotary Draw:[/B]Rotary draw bending (RDB) is a precise technology, since it bends using tooling or "die sets" which have a constant center line radius (CLR), alternatively indicated as Mean Bending Radius (Rm). Often a positioning index table (IDX) is attached to the bender allowing the operator to reproduce complex bends which can have multiple bends and differing planes. Rotary draw benders are the most popular machines for use in bending tube, pipe and solids for applications like: handrails, frames, motor vehicle roll cages, handles, lines and much more. Here's the stock pic of the JD2 Model 4 I use. [img]https://www.okshooters.com/data/MetaMirrorCache/www.jd2.com_images_Product_large_M4_20Bender_20Feature.jpg[/img] [/QUOTE]
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