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Square tubing bender

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Terry

03-28-2001 08:43:12




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I am needing to put a 90 degree 4" radius bend in several pieces of 3/4" 16 guage square steel tubing. Does anyone have any suggestions on the easiest way to do this. Factory bends that I have looked at have a dimple on the inside radius of the bend. Looks like it will be hard to do without a die of some sort.

Thanks, Terry




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tibbs

03-30-2001 08:03:43




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 Re: square tubing bender in reply to Terry, 03-28-2001 08:43:12  
I've seen in a magazine where square tubing is cut down the middle in a bandsaw through the radius of the intended bend only and then pulled around a cylinder as a die... After the desired bend is made, the slits where the tubing was cut is welded up and ground back....



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Al English

03-29-2001 13:29:48




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 Re: square tubing bender in reply to Terry, 03-28-2001 08:43:12  
Hi Terry, I don't know how good these bends need to be, but the only way to get really nice bends that tight in square tubing this thin is to either fabricate them from scratch or use a tube bender. There are different kinds of tube benders, the best being mandrel benders that produce bends with no kinks or collapsing. If you can find a shop that has the dies needed to bend your tubing there is going to be a set-up charge and minimum quantity. Some tubing shops run off batches of assorted bends and keep them in stock. If you can't get by with a bend you can make using sand/heat, I'd be looking for a supplier that stocks something you can use. Good luck...Al English

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Ray M41

03-28-2001 19:25:03




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 Re: square tubing bender in reply to Terry, 03-28-2001 08:43:12  
You know any electricians? You might borrow a 3/4" or 1" EMT tubing bender and try it. I hadn't tried it but it might work. The radius will be a little bigger though.



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T_Bone

03-28-2001 19:19:45




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 Re: square tubing bender in reply to Terry, 03-28-2001 08:43:12  
Hi Terry, You can use sand to fill the tube then cap it then heat and bend. This also works well with pipe. If bent to eight times the diameter/square then the tubing won't krimp on the inside radius or the throat as it's called. So if bending a radius on 3/4" tubing you would use a 6" radius from the throat edge. The outside radius is called the heal.

You could also make a bender just like a pipe "hicky" bar but with a flat radius. I would suspect that with cold bending that dimples would be on the throat.

T_Bone

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Alvin

03-28-2001 19:03:30




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 Re: square tubing bender in reply to Terry, 03-28-2001 08:43:12  
I have see and helped. We used a wheel die with electric power and heat. Also the tube has to be filled with sand to prevent kinking.



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Ray,IN

03-28-2001 19:00:50




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 Re: square tubing bender in reply to Terry, 03-28-2001 08:43:12  
Heat is used to bend; the dimples are the result of the heated metal scrunching up to allow the bend as only the inside is heated.. A separate bend die is used for each size and radius. Induction heating is common. I suspect a major undertaking if tried at home. I would use the cut/notch and bend/ then weld cuts, at home. Harbor Freight sells a tubing notcher, guality ???



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