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Drilling brass

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Drilling brass

Home › Forums › Beginners questions › Drilling brass

Viewing 6 posts - 1 through 6 (of 6 total)
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  • 1 August 2018 at 12:28 #364972
    Roger Hulett
    Participant
      @rogerhulett83124

      I need to drill three equidistant holes in a brass tube. I presume that I would centre the tube on my lathe and then scribe a line through which the hole centres would go, but how do I position those holes accurately ?.

      Having done that I need to cut a triangular hole in the tube (not on the same scribe line), how do I do that ?.

      Thankyou.

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      1 August 2018 at 12:28 #9278
      Roger Hulett
      Participant
        @rogerhulett83124
        1 August 2018 at 13:01 #364980
        Speedy Builder5
        Participant
          @speedybuilder5

          What do you call accurately? Most of us use a centre punch (without deforming the tube) and pre drill with a centre drill. You don't say how big the holes are, or diameter / thickness of the tube etc. A drawing always helps. Triangular holes start off from a round hole, and made triangular by a triangular file. You don't say what machines you have available, so I don't think we can help too much on the limited information. Perhaps give us a bit more info for a more precise answer.
          BobH

          1 August 2018 at 13:13 #364982
          JasonB
          Moderator
            @jasonb

            If they are equidistance around the tube an easy way to divide it into 3 is to hold in the 3-jaw chuck. Then find a block of metal or wood that will roughly fit between lathe bed and one of the chuck jaws, use that as a stop to hold a jaw against, mark position and then do the same with the other two jaws against the block.

            If you blue the tube with a marker pen then lightly dragging a tool in the tool post over the surface will mark the positions.

            Depending on the triangle a hole drilled first than a triangular file works well.

            1 August 2018 at 13:43 #364987
            pgk pgk
            Participant
              @pgkpgk17461

              Also if you set a pair of dividers to the width of the radius you can walk it around the circumference to divide into 6. Or wrap a pice of paper round the tube and measure/mark and transfer from that.

              pgk

              1 August 2018 at 14:22 #364996
              Roger Hulett
              Participant
                @rogerhulett83124

                Excellent, thankyou.. I took the easy route. A piece of paper, worked very well. Now for the triangle which I am not so confident with, however will persevere slowly. Thankyou all.

                .

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