![]() We were able to easily hold size, the center mandrel had to be hear treated though. All 3/4 conduit benders do not have the same radius as each other. Those numbers change based on the radius of the bending shoe. At 90 degrees the pipe has a gain in length. That material ended up with flats from coining of over 1/8" wide. DCAC said: Sounds like your talking about gain. Customer wanted no more than +.005" on the eye diameter. ![]() We had a large job where we needed to bend 5/16" diameter mild steel into a closed eye with a 3/4" ID. No matter how much you "engineer" the setup adjustments will still have to be made for different lots of material, but it's simple to change the nose clearance to accommodate. With the coining I'd start with a mandrel a bit less than 6". The coining will leave noticeable flats on the wire,both inside of the bend radius and outside, usually not a problem. ![]() In other words, the clearance between the bending nose and the mandrel is less than the wire diameter. To almost totally eliminate springback use a very high pressure of the bending nose against the material. ![]() on high-strength and high spring back materials Infinite repeatability. The spring back can be minimized by varying the nose pressure against the center mandrel (6" in your case). offers accurate precision and CNC tube bending capabilities for a variety of. ![]()
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