Circle cutting with oxy acetylene
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  1. #1
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    Jun 2013
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    Circle cutting with oxy acetylene

    Hi I've guys I've been oxy cutting for a year now and have never had to cut a circle. Tonight I had to for my BBQ project. When I did it the molten slag would come behind the hole I cut the way round not causing it to cut all the way through. Just wondering if anyone has any tips to help me. Thanks in advance
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  2. #2
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    Re: Circle cutting with oxy acetylene

    How big is the circle and how thick is the material ?
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  3. #3
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    Re: Circle cutting with oxy acetylene

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  4. #4
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    Re: Circle cutting with oxy acetylene

    Burning is burning, doesn't matter what direction you're going, flat, over head, it doesn't matter. I think your travel speed was to fast, or your tip to small.

    Here are some tools that really help to make nice circle cuts.
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  5. #5
    Join Date
    Nov 2006
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    Wilmington, De
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    155

    Re: Circle cutting with oxy acetylene

    In the 70's my former employer purchased a torch with a motorized head. You set the size, then fired it up, and let it do it's thing. You didn't have to follow the torch and drag the hoses in a circle. You held the torch steady and let it cut.

  6. #6
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    Apr 2012
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    Re: Circle cutting with oxy acetylene

    my version



  7. #7
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    May 2013
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    Re: Circle cutting with oxy acetylene

    When I cut a circle, if it's 2" or less, I draw it out, then start in the center and circle the torch around, pretty much burning away everything on the inside until I get to the actual lines.

    If it's a little bigger, I still start in the center, then move over to just inside of my line and trace it around. Die grinder to the inside edges and a file to finish.

    I've been meaning to put together a guide of some sort but I hardly ever cut circles anyway.

  8. #8
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    Jul 2012
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    San Marcos TX
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    Re: Circle cutting with oxy acetylene

    Here is a pretty cheap tool made for this, I dont have one I just saw this and bookmarked for later.http://jcaent.com/Page_2.html

  9. #9
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    Sep 2013
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    Re: Circle cutting with oxy acetylene

    . I made a Lazy Susa...Ok, a Lazy Doug that I rigged up. The torch sits in a saddle(3/4 angle welded on a stick of 3/16 x 1). That gets held to the table w/a welding magnet. Fire it up/adjust. Hold it in the saddle, pull the trigger and turn the work piece on the Lazy Sus.....Doug.
    Little crap I just drill some holes and then freehand or use pieces of cut off tube-pipe or old drops.
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  10. #10
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    Re: Circle cutting with oxy acetylene

    Farmboy that rig looks good. QuickNeasy !
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    Screw gun --bad battery (see above)

  11. #11
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    Oct 2007
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    Hendersonville, Tn.
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    Re: Circle cutting with oxy acetylene

    I'm with akabadnews about having to cut out all of the circle if it's a small hole I'm trying to get. On the other hand, if it is a small disc I am trying to cut out, I generally have to start further out from the actual desired diameter laid out for the disc, and make a large kerf, or even cut it twice sometimes. It seems that the trouble comes from the fact that all the cutting is being done in a small area, so the heat builds up quickly and that tends to keep the kerf zone too hot, and so the slag remains molten and fuses back into the kerf slit.
    But if you are not even cutting completely through the thickness of the material, then either your torch tip is too small or you are moving too fast (insufficient preheat time). If it comes down to insufficient preheat time, you can use the old timers trick of running a few circular passes around your marked circle to heat up the material before you actually start cutting a kerf.

  12. #12
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    May 2013
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    Re: Circle cutting with oxy acetylene

    Invest in a plasma cutter too.


  13. #13
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    Re: Circle cutting with oxy acetylene

    The circle has a 10cm diameter an it is 1/8 inch material

  14. #14
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    Jun 2013
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    Re: Circle cutting with oxy acetylene

    My tip is a number 8 the second smallest tip you can get in australia. I have the next size up as well

  15. #15
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    Jun 2007
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    BC Canada
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    600

    Re: Circle cutting with oxy acetylene

    You could have been going too slow too.
    Nothing Ever Got Done By Quitting, Never Give Up.

  16. #16
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    Sep 2013
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    central Wis.
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    871

    Re: Circle cutting with oxy acetylene

    I like to drill a small hole 1-8 or 3-16 right on the cut line then go from that point. It really helps on heavier plate,{over 1 inch thick } to get the cut going without blowback.
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  17. #17
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    Re: Circle cutting with oxy acetylene

    Quote Originally Posted by Grtpain View Post
    Here is a pretty cheap tool made for this, I dont have one I just saw this and bookmarked for later.http://jcaent.com/Page_2.html
    I bought this JCA circle cutter and I have to say, keep your money! It's poorly made and the fittings or attached components are extremely loose. This in turn makes the tool cut a very sloppy and crooked circle. I was thoroughly disappointed with this tool.
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  18. #18
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    Re: Circle cutting with oxy acetylene

    This is how I do it


    Disclaimer; "I am just an a$$hole welder, don't take it personally ."

  19. #19
    Join Date
    Nov 2013
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    334

    Re: Circle cutting with oxy acetylene

    Thanks tozzi for your input. I've learn so much from this subject and your pics. Thanks again.


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  20. #20
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    Oct 2007
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    New Hampshire
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    2,197

    Re: Circle cutting with oxy acetylene

    Here is a link to a cool motorized oxy-fuel torch with circle cutting capability from Koike Aronson. They used to make one similar to this for a plasma torch...although they discontinued that one.

    Link to video: http://www.koike.com/portable-soluti...auto-plus.aspx

    Jim Colt

  21. #21
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    Mar 2008
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    Georgetown, Texas
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    Re: Circle cutting with oxy acetylene

    That's pretty cool but I didn't see a price Jim. Have any idea how much it is?

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