![]() Depending on the tube diameter this could be a very large multiple but again moving away from the standard 2 x D invites tooling charges. It is possible to have a tighter bend radius, even as low as ½ x D, although anything below 2 x D will usually require costly tooling and probably mandrel bending.Īt the other end of the scale, the maximum draw bend radius is not dictated by the performance of the tube but more by what tooling it is feasible to fit onto the bending machine. What that means is that if you have a tube OD (outside diameter) of 20 mm then the bend radius to choose, if you can, is 40 mm. ![]() Another option is to set up a tube bend chart which actually defines the way a CNC tube. So in this case, the minimum inside bend radius is 2 times the material thickness. Tube bends are specified using the centerline radius (CLR). Now, multiply that answer by the plate thickness. Next, subtract 1 from that answer: 5 1 4. When we talk about bend radius it refers to the radius measured to the center line of the tube.Įvery CNC pipe/tubing bending machine will have a different set of draw bend radius tooling based on previous jobs that they have done, but by far the most common will be in line with the first rule of thumb The standard draw bend radius is 2 x D If the steel has a tensile reduction value of 10 percent, divide 50 by that value: 50/10 5.
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