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Tool Talk Discussion Forum

BURNING HOLES IN PIPE

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SHORTORDER

08-15-2007 18:41:19




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I normally mark my pipe with regular chalk, and then start burning holes with tourch. The problem is that the heat removes the chalk and then your burning the hole by trail and error. My holes always seem to end up with a irregular shape. Is there a method a person might use to mark the hole and get a good hole burned in the pipe. The hole I'm attempting to burn in the pipe will be 3/4 inch. I just know there has to be a better way then, what I'm doing. Thank for any help.

shortorder

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Logan in S.E. Texas

08-17-2007 22:10:28




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 Re: BURNING HOLES IN PIPE in reply to SHORTORDER, 08-15-2007 18:41:19  
after marking with chalk/soapstone use a center punch and make punch marks about every quarter inch or so, and cut from one to another.



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soundguy

08-16-2007 07:48:24




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 Re: BURNING HOLES IN PIPE in reply to SHORTORDER, 08-15-2007 18:41:19  
Mark it with a scribe.. guaranteed to not burn off..

Soundguy



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Joe(TX)

08-16-2007 05:55:55




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 Re: BURNING HOLES IN PIPE in reply to SHORTORDER, 08-15-2007 18:41:19  
Mark it with soap stone. Available at any place that has welding supplies. You can mark it with a center punch several places as well as using the soap stone.



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Joe(TX)

08-16-2007 05:55:50




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 Re: BURNING HOLES IN PIPE in reply to SHORTORDER, 08-15-2007 18:41:19  
Mark it with soap stone. Available at any place that has welding supplies. You can mark it with a center punch several places as well as using the soap stone.



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Bison

08-15-2007 22:39:02




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 Re: BURNING HOLES IN PIPE in reply to SHORTORDER, 08-15-2007 18:41:19  
If you need to cut a lot of holes, wy not take a piece of pipe that slides over the one you want to cut, weld a 1/2' of pipe or bearing race to the side,big enough to circle the torch inside around so you end up with the 3/4'hole you want. if you weigh the piece of pipe at the bottom, it will let you cut all holes in line without to much eyeballing.



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Les Mack

08-15-2007 20:41:51




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 Re: BURNING HOLES IN PIPE in reply to SHORTORDER, 08-15-2007 18:41:19  
maybe I'm missing something here, but why not try/use a hole saw? I know I've used them on pipes of different sizes with success.



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Don L C

08-16-2007 07:02:20




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 Re: BURNING HOLES IN PIPE in reply to Les Mack, 08-15-2007 20:41:51  
A holesaw or pipe angle cutting jig..... .Harber Freight



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Cheesehead Fred

08-15-2007 20:25:59




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 Re: BURNING HOLES IN PIPE in reply to SHORTORDER, 08-15-2007 18:41:19  
We've had success with two methods of marking shapes to be cut with a torch. If it is a round hole you need, scribe a circle with a compass or scribe around a round object. Use a very sharp scribe, such as a carbide tipped one, and bear down on it, so you cut a groove and leave a little raised ridge on either side of the groove. When you are cutting, the heat of the torch will make the raised edge glow orange before you get to it with the actual tip of the torch. For cutting irregular shapes, prick punch a row of dots that follow the contour. The heat from the torch will make the upset metal around each punchmark glow, so you can see the route and cut it. It takes more time than chalk, but it's a lot easier to see.

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Jim in N M

08-15-2007 20:17:33




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 Re: BURNING HOLES IN PIPE in reply to SHORTORDER, 08-15-2007 18:41:19  
I find useing a silver pencil works good for me. Jim in N M



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pork

08-15-2007 18:47:45




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 Re: BURNING HOLES IN PIPE in reply to SHORTORDER, 08-15-2007 18:41:19  
is your pipe painted, galvanized or coated? if so, as the coating burns, so does the mark. grind off coating first. if not get some soapstone from a welding supply or at napa, it wont burn away as easy as school type chalk.



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SHORTORDER

08-15-2007 19:39:32




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 Re: BURNING HOLES IN PIPE in reply to pork, 08-15-2007 18:47:45  
Pork I'm using black pipe. I always use regular welders chalk. I have never grinded the pipe, I will have to give that a try. I did notice the the black pipe does have a thin coat of paint on it. The grinding should remove that. I just have never seemed to have luck with the chalk not coming off. Thanks for your input.

shortorder



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135 Fan

08-15-2007 20:39:24




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 Re: BURNING HOLES IN PIPE in reply to SHORTORDER, 08-15-2007 19:39:32  
It's soapstone to use for marking steel usually. Paint markers will work also. Take a sanding disc or flap disc and clean the pipe off to shiny metal, then mark the hole with a sharpened soapstone so you get a narrow more accurate line. Then run your torch over the line without cutting. It tends to make the soapstone mark stay on. Dave



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rasmutin

08-15-2007 22:10:29




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 Re: BURNING HOLES IN PIPE in reply to 135 Fan, 08-15-2007 20:39:24  
rent a plasma cutter, they work great



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dan hill

08-16-2007 03:49:22




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 Re: BURNING HOLES IN PIPE in reply to rasmutin, 08-15-2007 22:10:29  
There are tools you can use in a drill press that use a hole saw to cut holes in pipe.



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