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Bending Pipe

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tom

10-07-2001 20:43:54




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I need to bend some 1 inch pipe into a u shape How could I make a jig to bend them all the same. I could use a car wheel with a long lever on it but I do not know how to get them all exactly the same with out some kind of a jig Any help would be greatly appreciated.




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steve

10-09-2001 21:06:24




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 Re: Bending Pipe in reply to tom, 10-07-2001 20:43:54  
I've bent 2" square tubing before by welding an end to a piece of pipe or wheel. Then heat the tubing red hot and bend SLOWLY around the pipe jig
(or wheel, whatever you can find) being careful not to bend or twist the tubing sideways. After your bends are made, cut or grind the welded end off the jig, place on flat surface and make sure it lays flat, unless of course you want it to be bent more ways than one. If you didn't use sand or some sort of filler, (I never have) try heating the bend red hot again and hammering back into shape. If you take your time, you can have a piece that looks factory made.

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Bob Kerr

10-08-2001 21:49:28




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 Re: Bending Pipe in reply to tom, 10-07-2001 20:43:54  
I have heard of a way to bend heavy gauge pipe but I have never tried it although I am sure I will when the need arises.This works best if you have access to a blacksmithing forge. Start with a pipe a little longer than you need. You take the pipe and thread both ends and cap one end. Then fill the pipe with dry sand and cap it off.This next part is Very important!!!! drill a hole in one or better yet both ends of the caps of the caps. It will let out any steam that could possibly develop and cause an explosion. Then heat the pipe red hot and make your bend. Uncap the ends and dump out the sand but be careful as the sand will be very hot.Don't dump the pipe in water! Water could get inside and cause it to blow up even though you have holes driled.Then cut the pipe to the needed length. The sand will keep the pipe from collapsing when you make the bend. If you are making just a couple parts you can use a block of hard oak or other hard wood, firewood cut to 1" larger the shape you need and then cut in a half round grove 1/2" half inch deep to bend the pipe in. That should get you close to the right inside radius. A router would work good for that. The wood will burn and smoke like crazy when you go to bend the hot pipe but you should get a few parts made from the jig before it is cooked out of shape totally.Also don't wet the wood with water as it will cause the inside radius of the pipe to temper where the outside radius will not get the same treatment. use a slightly damp rag if you get a fire on the wood jig, but keep the wood as dry as possible.Also if the pipe is seamed pipe, keep the seam along the side of the bend.If the seam is on the outside radius the pipe may split. If you are doing this to make a high pressure water tube boiler I wouldn't do it without consulting an engineering firm!

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RayP(MI)

10-08-2001 19:14:39




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 Re: Bending Pipe in reply to tom, 10-07-2001 20:43:54  
Mother nature bent a 1" pipe for me that I had used to support a TV antenna. Thought I was a pretty strong - put it between two trees, and I couldn't straighten it! You'll need a hydraulic bender - don't know if a pipe bender designed for auto exhaust pipes will have the leverage. Best get this done by a shop with the proper equipment.



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RayP(MI)

10-08-2001 19:14:33




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 Re: Bending Pipe in reply to tom, 10-07-2001 20:43:54  
Mother nature bent a 1" pipe for me that I had used to support a TV antenna. Thought I was a pretty strong - put it between two trees, and I couldn't straighten it! You'll need a hydraulic bender - don't know if a pipe bender designed for auto exhaust pipes will have the leverage. Best get this done by a shop with the proper equipment.



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greaseman

10-08-2001 17:12:18




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 Re: Bending Pipe in reply to tom, 10-07-2001 20:43:54  
I agree with Mac and Dusty, I personally think it will be worth every penny to have an exhaust pipe bending machine do the work for you. I am going to be getting a quantity of alluminum channel and am going to have a friend of mine with a metal cutting band saw do the work.



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Mac

10-08-2001 10:13:22




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 Re: Bending Pipe in reply to tom, 10-07-2001 20:43:54  
I don't know how many pcs of pipe you need to bend Tom. Myself, I think I would check with a exhaust system shop or an electrical contractor. They have hydraulic benders and could be a bit more precise. I dont think the fee for the bending will off set the time and problems you may have on the D.I.Y job.



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Dusty

10-08-2001 08:48:53




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 Re: Bending Pipe in reply to tom, 10-07-2001 20:43:54  
If there is an industral electical contractor in your area, they most likley would have a Greenlee bender called a circle, or sometimes a 555 bender, it will due what you want.
Good Luck,
Dusty



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Bill

10-08-2001 07:53:06




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 Re: Bending Pipe in reply to tom, 10-07-2001 20:43:54  
Don't know how much pipe you need to bend, but you might try one of the hydraulic pipe benders from Harbor Freight or Homier Distributing. They run about $100.00 and come with multiple dies. I've never used one and have heard both good and bad about them. Maybe someone could shed some additional light on this option. You could always buy it, use it, and then probably sell it either through one of the community bulletin boards like in grocery stores, etc. or in a garage sale. Just a thought. Good luck. Sometimes it cost more to make your own bending jigs.

Bill

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Ray,IN

10-07-2001 21:52:20




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 Re: Bending Pipe in reply to tom, 10-07-2001 20:43:54  
What radius? Pipe or tubing will ordinally require a filler(sand) to prevent collapse. Assuming the auto rim you referenced is the correct radius, you will need to hold the starting end firmly to prevent movement, the start end will exert the same force as you apply and will try to follow the bending force. You have the basic idea already; when you build the fixture to actually bend the pipe make sure its strong enough, 1" pipe will be quite hard to bend. You'll still need to heat the inside of the radius as you bend the pipe I suspect. Allow enough extra length to cut the running end even with the start end. After the first one you will be able to precut your pipes to length prior to bending if you wish, just measure the cutoff end and substract from the original length. The formula for 180deg. pipe bending is; r x 3.14 plus length of straight sections, if you'd rather use it.

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