ghenges
Bronze Member
I have got some rectangular tubing that I need to bend a tight radius. It is 1x2x.125 Rectangular tube. I need to bend four pieces that are 30 inches long. The image below shows two of the pieces as they will appear finished. Wondering what would be the best way to bend something like this. I would like to do it myself, I did phone some machine shops and they wanted a lot of money. Any suggestions would be appreciated.
View attachment 310193
Very tight radius you are attempting to bend. Won't say it's impossible, you'll need to experiment to see just how tight a radius you can accomplish.
Bends like this are usually accomplished by mandrel bending.
You can "approximate" the mandrel bending process at home by filling the tube to be bent with molten lead (melt down a car battery or two). Lead is way better than sand.
The lead can be removed by simple heating the tubing.
Cerrobend is better than lead, but costs $15.00 - $20.00 a pound.
Make a jig on your shop press or rig a hydraulic cylinder to essentially emulate a press break. It's going to take substantial pressure to bend the tubing.
Another method is enclosing the tube by welding the ends shut, on one end fit it with a 3/8" hex socket screw or pipe plug.
Fill the tubing with water, screw in the plug and bend. The pipe can also be frozen to increase the internal pressure, being careful not to burst the tubing.
Please let us know how you make out.
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