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Cast Dome Build Brisbane - Forno Bravo Forum: The Wood-Fired Oven Community

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  • Cast Dome Build Brisbane

    Hi All,

    Just getting into the build of my new WFO and thought i'd share progress. Going to be a cast dome construction with a 900mm internal floor dimension with 450mm entrance width.

    I just picked up most of the materials last weekend including 75mm fire bricks for the floor and Refractech Castable for the dome. Also picked up 50mm ceramic fibre board for under the floor and 50mm blanket for the dome. I managed to find a guy in Brisbane who is selling all of the refractory materials so got it all from one place and at a pretty good price i think.

    So far i have almost finished welding up the stand and cut the board for under the bricks. A few pics below show where i am up to. Hopefully finish the stand this weekend and starting cutting the floor bricks.

    Any feedback would be great.

    Cheers
    Reidy


  • #2
    David S is our resident casting expert and he is just up the road from you (well kind of in Townsville, Queensland).Look at his posts and thread. He does cast ovens commercially and has tons of tips. He can confirm yeah or nay on the refractory cast, I do know he says to make sure the product in a dense cast not an insulating cast.
    Russell
    Google Photo Album [https://photos.google.com/share/AF1Q...JneXVXc3hVNHd3/]

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    • #3
      I canít see how thick the steel is, but ovens are really heavy and your stand appears to be no where strong enough. It needs to be stronger than you would think. Also if it is to be sitting in that deck youíll need to weld on some horizontal pieces at the base so the weight is not sitting on those four legs. The deck supports may also need reinforcement to take the extra weight. A collapse can be catastrophic Also add some diagonals or at least gussets at the corners.
      Last edited by david s; 09-06-2019, 12:37 PM.
      Kindled with zeal and fired with passion.

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      • #4
        Hi David,

        The steel is 50x25x2.5m. I was planning a few braces and possibly doubling the legs and putting some plates on the bottom. The other thing I was sure was if the 6mm FC sheet was enough under the fibre board. The steel is about 200mm centres across the top. I estimated 6bags of castable and the floor is about 40 bricks, so the overall weight I think will be 400-500kg. Iíll post a better pic of the stand later as my iPad wonít let me add one.

        It wont be living on the deck. Ill be making a spot just off one side which is propoerly supported. I was thinking of casters on the legs but not sure.

        cheers
        reidy

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        • #5
          Got chrome to work for the pic

          I am also planning to have a steel band say 50x3 flat bar, welded around the circumference of the dome onto the ends of steel support rails.

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          • #6
            The normal base for an oven is 100 mm reinforced concrete. I think 6 mm cement sheet over 200 mm spaced steel supports is way too thin. Either 18 mm sheet or weld more bearers so they are 100 mm centres would be better.
            Kindled with zeal and fired with passion.

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            • #7
              Thanks mate. I did think it was maybe pushing it. I was trying find some 12mm sheet but couldnt get my hands on any for a decent price. Anyway I went ahead today and whacked some more supports in. Space between supports is now 95mm. Also put in some bracing around the bottom. Didnt go with Doubling the legs yet, Might see how it goes. I can always add them later.

              trimmed the entrance back. So it will be about 280mm deep and actually had to make it a bit narrower so its now 400mm. Hope thats not too narrow or too deep. The reason to go a bit narrow was to fit the bricks either side. See pics to see what I mean.

              Also marked how I will cast the entrance with a rebate for the door. I will make up some timber forms for the front to give me the mould for the rebate.

              cheers
              Reidy

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              • #8
                Ok, stands done. Just needs a lick of paint. I think you can land a 747 on it now.

                ready to cut some bricks.
                Last edited by Reidy; 09-13-2019, 10:23 PM.

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