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Adjustable indispensable tool ellipse dome - Forno Bravo Forum: The Wood-Fired Oven Community

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Adjustable indispensable tool ellipse dome

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  • Adjustable indispensable tool ellipse dome

    I am trying to work out how to adjust an indispensable tool so it will make an ellipse without causing the bricks to be stepped. The tool I am planning to make will have a turnbuckle for adjustment which will reduce the length of the tool by 3 mm (1/8th inch) per turn

    My calculations are as follows (I will include measurements in mm and inches)

    Internal radius at floor 550mm (21.65 inches) (1100 (43.3 inches diameter)
    Proposed Dome height 400mm (15.7 inches)
    Required reduction in dome from standard hemisphere 150mm (5.9 inches)
    Number of turns of the turnbuckle to reduce height 50
    Number of courses of bricks 10
    Turns per course 5
    Length adjustment per course 15mm (.59 inches)

    Given the above, if I angle the face of the indispensable tool that is against the brick by 15mm (.59 inches) (7.5 mm (.3 inches) top and bottom) to allow for the difference in the length of the tool will I eliminate the steps and get a smooth dome?

  • #2
    Re: Adjustable indispensable tool ellipse dome

    Muscats,

    I made a similar adjustable tool as you are talking about only mine was made from 10mm threaded rod for a 500mm internal radius oven (at the floor) and I adjusted the radius for my oven by 5mm every course of bricks.

    You are welcome to have it if you are willing to pay the postage costs from Newcastle to the ACT. I can even send you another length of threaded rod if you want to start with a larger radius.

    Let me know if you want it.

    Paul
    Attached Files
    Paul

    Deficio est nusquam tamen vicis ut satus iterum
    (Failure is nothing but the opportunity to start again)

    Comment


    • #3
      Re: Adjustable indispensable tool ellipse dome

      Paul;
      *
      That tool looks perfect and it looks like it was doing a grand job with your dome.
      I would be honoured to use it to make my oven.
      I am still a while off starting though. I have to wait for our pergola to be build so I don't end up putting the oven where one of the posts goes and the plans for the pergola are still in with the council (been waiting over a month already).
      Please let me know how much postage would be to Canberra area and your prefered method of payment send me an email with the details.
      scribblygums@burrastationestate.org
      If you already have the extra rod Ill take that too but dont spend any extra on it.

      Paul

      p.s. As has been the tradition on this site i will endevour to pass the tool onto another WFO builder in due course.
      Last edited by Muscats; 05-16-2010, 05:13 AM.

      Comment


      • #4
        Re: Adjustable indispensable tool ellipse dome

        The face angle changes with every shortening of the tool. On my build I've been ignoring the face angle of my tool with each course for the most part and simply aligning the bottom edge of the brick to the top edge of the brick beneath it. Otherwise, the tool does an excellent job of maintaining a circular plane of each course of bricks layed.
        My floor radius is 17" and my dome height will be a fraction under 15".

        George
        George

        My 34" WFO build

        Weber 22-OTG / Ugly Drum Smoker / 34" WFO

        Comment


        • #5
          Re: Adjustable indispensable tool ellipse dome

          I did the same as you George to cope with the change in the angle of the face of the tool. The tool held the top of the brick and I just lined up the bottom of the brick with my fingers as I placed each brick and wiped the excess mortar off the brick face.

          Paul
          Paul

          Deficio est nusquam tamen vicis ut satus iterum
          (Failure is nothing but the opportunity to start again)

          Comment


          • #6
            Re: Adjustable indispensable tool ellipse dome

            My brick placement tool is adjustable on two axes (floor arm and radial arm) to achieve any curvature with perfect brick alignment. The floor arm slides inward "across" the center of the floor such that the hinge moves toward the center of the floor, one notch (as shown) per brick level. Meanwhile, the radial arm gets steadily longer per brick level. I specified the notch locations to 1/16" accuracy although that is a matter of taste. Less precision would be fine. Here's a schematic (for my particular oven) and a few photos:








            Website: http://keithwiley.com
            WFO Webpage: http://keithwiley.com/brickPizzaOven.shtml
            Thread: http://www.fornobravo.com/forum/f21/...ttle-7878.html

            Comment


            • #7
              Re: Adjustable indispensable tool ellipse dome

              The results would pretty much be the same whether you use kebwi's method of readjusting the tool for every course or manually aligning (visually and/or by feel) the bricks as Paul and I did.

              BTW, that's a pretty clever design of the tool Keith. I saw that during your dome construction.

              George
              Last edited by fxpose; 05-18-2010, 08:57 AM.
              George

              My 34" WFO build

              Weber 22-OTG / Ugly Drum Smoker / 34" WFO

              Comment


              • #8
                Re: Adjustable indispensable tool ellipse dome

                Agreed. I'm just explaining my process. I'm certainly no advocating it. The payoff for such absurdity is probably nil...at best.

                BTW, for all the precision I put into my oven, it has produced numerous cracks. I even have a wobbily keystone in one of my arches. Really makes me question the benefit of designing and shaping the oven and bricks so meticulously. What's the point if the mortar all cracks out and the oven ends up standing under its own compressive strength anyway? Oh well.

                Website: http://keithwiley.com
                WFO Webpage: http://keithwiley.com/brickPizzaOven.shtml
                Thread: http://www.fornobravo.com/forum/f21/...ttle-7878.html

                Comment

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