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Tool Talk Discussion Forum

cutting pipe

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jimbob2000

08-13-2007 06:02:51




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I am going to cut some 6 inch diameter pipe that has a 1/4" thick wall. What is the best way to get a good square cut. I have a oxy/acetylene torch or a chop saw that can be taken apart and used as a handheld saw. I tried this once before and with the torch and it is hard to get a good square cut. I just drew a line and tried to trace it. What is the secret to cutting this pipe?




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135 Fan

08-13-2007 17:48:08




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 Re: cutting pipe in reply to jimbob2000, 08-13-2007 06:02:51  
6 inch pipe is too big for a portable cut off saw. A band saw or power hacksaw would work the best but a torch can still be used but you have to be really steady and comfortable to do it. Mark the pipe with a wrap-a round (wide straight roll of thick paper board that's flexible) and always cut going up on pipe so the slag doesn't get in the way. To clean the edge up use a 7 inch grinder and hold the whole grinding wheel flat on the pipe so all of the wheel is in contact with the pipe. You can move the grinder in small circles and it will take off any high spots. It can be checked with a straight edge and a square. Dave

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NE IA Dave

08-13-2007 17:06:13




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 Re: cutting pipe in reply to jimbob2000, 08-13-2007 06:02:51  
If you take the guard off many chop saws, the one that must be slid up on some or a thumb screw released on others (to change the blade) you can just rough cut it and then take the pipe and push it sideways to square up the end.

If that is not a option use a large bench grinder (after a rough cut)and push sideways on that. A 8" would probably be as small as you can use. If you need it exact, then mark it with a plastic coupling that you have split in one place, and slip it over the pipe. Use a very small felt tip magic marker if you want a very fine mark.

Over cut the mark and then just grind down to the mark, you can get it perfect. You must have two people for a longer chunk of pipe.

If you do not need perfect perfect a 14" chop saw will work pretty good. A trick is to get the pipe square on the small platform and have a new blade. Then cut as deep as you can cut, then spin the pipe with saw clear down.

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midwest redneck

08-13-2007 09:20:33




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 Re: cutting pipe in reply to jimbob2000, 08-13-2007 06:02:51  
Use a large lathe. Works for me. If you dont have a lathe then get a pipe cutter.



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old

08-13-2007 08:09:04




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 Re: cutting pipe in reply to jimbob2000, 08-13-2007 06:02:51  
Chop saw or band saw is about the only way to do it and get a good cut.



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msb

08-13-2007 06:23:59




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 Re: cutting pipe in reply to jimbob2000, 08-13-2007 06:02:51  
Support the pipe well in your chop saw and turn the pipe as you cut. Best way I know.---- You can wrap a piece of thick paper around the pipe and pull it tight if you want to mark it. The paper will square up when you pull it tight if you keep both ends of the paper even with each other.



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bva

08-13-2007 20:30:23




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 Re: cutting pipe in reply to msb, 08-13-2007 06:23:59  

Yes. Lay the pipe so it will turn freely (rollers) and square. this type cut is a good reason to keep those worn blades that will not cut much as you only need to get thru the 1/4 inch. If the pipe is square to chop saw the cut will be square without markin all way around the pipe.



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coloken

08-13-2007 07:18:44




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 Re: cutting pipe in reply to msb, 08-13-2007 06:23:59  
I use a piece of leather strap, like an old belt.



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