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Tool Talk Discussion Forum

Pipe bender kinking pipe

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Todd

03-27-2004 19:10:18




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Hello
I am trying to bend so 11/4 pipe shed 40 wall into a 90 degree angle. The pipe keeps on kinking does any one have suggestions on what to do to stop this.




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old

03-28-2004 09:40:32




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 Re: Pipe bender kinking pipe in reply to Todd, 03-27-2004 19:10:18  
Fill the pipe with sand cap off both ends and bend it, then open it up and let the sand out. That is per the instructions I have with my pipe bender



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Turtle

03-28-2004 09:15:28




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 Re: Pipe bender kinking pipe in reply to Todd, 03-27-2004 19:10:18  
Depending on the radius you are trying bend at, conduit is about equvilent to a sch 40 pipe. Conduit benders use a longer radius than some simple pipe benders you would get from some place like Harbor Freight. Might I subgest that in order to save time and possibly money that you contact some of your local elect. shops and see if they have a bender, and would consider for a small fee to bend it for you or even help you bend it. If this is not an option you will have to bend it in several different shots creating a larger bending radius. Unless the pipe is pure junk this will fix the problem. Where might you be located?

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Steve from MO

03-28-2004 06:59:01




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 Re: Pipe bender kinking pipe in reply to Todd, 03-27-2004 19:10:18  
Unless you really need a bent pipe for some other reason, you might use an elbow. They aren't that expensive.



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Bus Driver

03-28-2004 05:17:18




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 Re: Pipe bender kinking pipe in reply to Todd, 03-27-2004 19:10:18  
I assume that you mean schedule 40 pipe. I have seen hydraulic benders that bent some pipe just fine and would kink other pipe. Had to be the pipe, as Russel points out. Probably the pipe has uneven wall thickness or spots with very different steel content. That might happen if the scrap used in making the pipe was old files or ball bearings



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LesWV

03-27-2004 21:33:45




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 Re: Pipe bender kinking pipe in reply to Todd, 03-27-2004 19:10:18  
1 1/4"
At what radius are you trying to bend the pipe? And what type of bender? 40 is very thin walled and will not take to bending at sharpe angel very well. Another thing with bending pipe that is not noticed by many people. When you make a bend. The pipe will twist somewhat. Take a pencil and draw a straight line down the full lenght of a piece and bend it. You will see what I am talking about.

I will agree with Russel. If you can use electric conduit. You will get much better results. For you can not bend a piece of 1 1/4" X .40 tubing around a 1, 1 1/2 or 2" die to a 90 degree angle and get good results. It is just to thin.

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RusselAZ

03-27-2004 20:24:34




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 Re: Pipe bender kinking pipe in reply to Todd, 03-27-2004 19:10:18  
It is probably the pipes fault. All pipe isn't of a quality for bending. You can improve your odds of getting a good bend by having a little grease on the oxbow pusher part and cleaning the outside post with a little 220 or 320 sandpaper. This makes the pipe grip the posts better and lets the pusher part slip.

If your pieces don't have to be to long use some electric conduit. It only comes in 10 ft lengths but is made to be bent.

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thebigron

03-27-2004 19:39:12




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 Re: Pipe bender kinking pipe in reply to Todd, 03-27-2004 19:10:18  
I have not tried it myself, however, I have heard of filling the pipe with building sand (not wet, of course) and heating it with a torch until red and bending then. I'm sure you could control your actual radius with the length you heat. If you cannot stand for the inside of your pipe to get dirty this would not be your ticket. If you do use it let us know how it turned out.



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Earl Borchardt

03-28-2004 09:22:53




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 Re: Re: Pipe bender kinking pipe in reply to thebigron, 03-27-2004 19:39:12  
Gents,
We need much more imput into this subject. About the only way that I can get a decent job is to wrinkle bend using a torch. I know that some guys can do a good job using one of those $70.00 benders that you see at HF. I have tryed it and failed. Just useing sand is not the answer.
Thanx, Earl



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Slowpoke

03-29-2004 23:33:00




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 Re: Re: Re: Pipe bender kinking pipe in reply to Earl Borchardt, 03-28-2004 09:22:53  
If you look at factory bends, you will see that with a long radius, the inner curve will be smooth. As the radius gets shorter, the inner curve will wrinkle. For a very short radius, the inner curve metal is forced toward the inside of the tube, creating a depresssion. For rigid emt, preformed bends are available.
If the stuff you're bending is thinwall, a muffler shop will have equipment. For heaver material, thread it and use elbows, or cut and weld would be the least costly way.

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