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Advice on curva-o-matic

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  • Advice on curva-o-matic

    Have been reading here for awhile but this is my first post here. Trying to make a "T" out of 10' thin wall pipe. First one turned out ok (with a lot of filling in) but the second cutting will have to be used as something else. Can't quite figure out how to use the tool. Thanks
    Jed

  • #2
    Are you refering to a curve-o-mark? If I remember right use the
    arm from the bottom upwards. It should have spring washers at the joints to help holding the correct contour. What type of problems are you having? I have a instruction book around here somewhere, let me know if I can help.

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    • #3
      Yea, Curve-O-Mark is what it is

      The one I have is for 1.5" to 18" pipe accordig to the book. But it won't mark all the way around the 10" pipe so I have to mark from both sides. Using 45 degree setting. Is this something I just have to pratice & cut up lots of pipe to learn? Thanks
      Jed

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      • #4
        I used a curve o mark a couple of times several years ago and I think it's easier to lay out a branch the old fashion way. A common welding test in outside pipe work is a 12" on 12" inverted branch. Some places make you lay it out the old school way, a few let you use a template. If you want to lay one out by hand, as well as just about any other concievable pipe or tube joint, then buy a copy of "Blue Book of fitters...welders pattern and layout manual" by H.G. Thorsness, or, "The Pipefitters and Welders handbook" by Thomas W. Frankland. I like the blue book better but Frankland's book is easier to find.
        I think you will have better luck that way than trying to get a good layout with the curve o mark.
        Of course a template is the bestest and easiest. You can make your own, buy one, or use a computer program I hear folks have good luck with, but I've never used one.
        With a good template you will get a very close fit that only requires a small amount of fine tuning.
        What are the pieces for?

        regards,
        JTMcC.

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        • #5
          Making T's and if I can learn how will make some Y's to use to hook flexible irrigation pipe together.
          Jed

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          • #6
            Originally posted by Jed
            Making T's and if I can learn how will make some Y's to use to hook flexible irrigation pipe together.
            After you get one really nice fitting example made, make yourself a template from it and you are all set to build several more painlessly.
            The problem with using a curve o mark, as I see it, is that the long arms just aren't rigid enough to hold the very close tolerance you need for a nice fit.

            good luck,
            JTMcC.

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            • #7
              you'll have to mark from both sides of the pipe. Looked it up in the book above 8" need to mark from both sides.

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              • #8
                Thanks for the help. I found & ordered the Blue Book. Tomarrow I will try the curve o mark some more also.
                Jed

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