#11  
Old 08-03-2009, 09:51 PM
Dino_Pizza's Avatar
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Default Re: Texas 42

I did NOT use an "indispensable" tool. I see what you mean about the fulcrum location and it's effect. Someone else will have to tell you if you have to adjust the angle at each course. I used a stick on a pivot that was about 10" long. The pivot made my dome consistently round, but I just eyeballed each bricks 1" or less distance from the pivot. Since my method worked satisfactory, I think yours will be even better.
Still...your pics show a real tight and accurate build. I can appreciate your attention to detail: it will make the final oven quite nice, even with minor adjustments along the way.
-Dino
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  #12  
Old 08-04-2009, 09:35 PM
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Default Re: Texas 42

I used the indispensable tool with great success. My pivot was probably an inch lower than yours.

suggestion: trust the tool but cheat.

Stand the tool straight up.
measure the height from the plywood to the bracket and add a half inch for the plywood.
This is how high high your dome will be if you follow the tool as is.
since your radius is 21 and your pivot is about an 1 1/2 inches off the floor your probably looking at approx 22 1/2 inches.

count the threads per inch on you tool. assuming you want about a 21 inch dome height, you want to shorten the toll by 1 1/2 inches by your last course.

Since you have about 10 courses to go. Multiple the number of threads per inch, by 1 1/2 and divide by 10. probably about 2.

So each course shorten your tool by 2 turns and it will slowly bring each course in.

I did something similar cuz I just wanted a shorter dome height.

regards
greg
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  #13  
Old 08-05-2009, 07:01 PM
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Default Re: Texas 42

Thanks Greg. Gotta dust off the geometry skills....
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  #14  
Old 08-09-2009, 07:37 PM
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Default Re: Texas 42

Got the 1'st chain done today. Really interesting watching the firebricks fiz when you first put them in the soaking bucket. I really like the homebrew mortar. Easy to work with and sets well. I do have a bag of Heatstop 50 I will switch to when I get to the upper chains. I figure it will be nice to have something that sets quick for the bricks that need held in place until they set.
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Texas 42-texas-42-oven-2009-08-09   Texas 42-texas-42-oven-2009-08-09   Texas 42-texas-42-oven-2009-08-09   Texas 42-texas-42-oven-2009-08-09   Texas 42-texas-42-oven-2009-08-09  

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  #15  
Old 08-15-2009, 09:09 PM
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Default Re: Texas 42

Spent the day on the saw. I have discovered that most of the time building one of these things involves hours on a brick saw getting covered in a fine mist of water and brick dust. Cut several bricks up for chains then moved to the inside arch. Dry fitting everything first then will have a 'mortar day'.
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  #16  
Old 08-15-2009, 09:11 PM
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Default Re: Texas 42

Got my son involved filling the gaps between the soldiers with brick cut-offs. Showed him how to measure and score the brick pieces then cut them with a sharp hammer blow and a brick chisel. He did a fine job. We'll mortar everything over when all gaps are filled.
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Texas 42-texas-42-2009-08-15-001   Texas 42-texas-42-2009-08-15-002   Texas 42-texas-42-2009-08-15-003   Texas 42-texas-42-2009-08-15-005  
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  #17  
Old 08-19-2009, 10:38 AM
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Default Re: Texas 42

Once you get a rythm going, it goes up pretty quick. Free labor is always a good thing and bonding time with your son makes the project invaluable.
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  #18  
Old 08-25-2009, 06:39 PM
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Default Re: Texas 42

Got the inner arch one and have worked a solution for the flue area. Found out that trying to mortar bricks after the oven has heat soaked all day long in 100+ degree heat just does not work. Even though it is not in the sun the brick temp was up there. I soaked mortared the bricks as much as possible but the mortar still would not stick well. Finally gave up and went at it the next morning with success.
My inner arch is 12.5 inches high and 21" wide with a 1" reveal, and has a fairly aggressive curve. The flue transition will be 12" x 7" giving me 84"sq. this should work with a 9" flue liner.

I am planning on the outer arch being only 12" total height with a shallower curve, resulting in a lower lip inside the flue transition. This should prevent smoke spills out the front if my draft is sufficient.

After my arches are done I will complete the rings.

Any comments, suggestions, criticisms?
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Texas 42-texas-42-2009-08-23-002   Texas 42-texas-42-2009-08-23-004   Texas 42-texas-42-2009-08-23-006   Texas 42-texas-42-2009-08-23-009   Texas 42-texas-42-2009-08-23-007  

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  #19  
Old 08-26-2009, 06:37 AM
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Default Re: Texas 42

Won`t lowering you outside arch impede, at least a little, the ease of slipping in a tight fitting door? I just finished this stage and kept my outside arch(actually a double arch of 2 1/2 inches except for the first two bricks on each side) the same 1 inch+ height above the inner arch. We have a great stainless insulated door 2 inches thick that slides in and plugs the inner arch (many thanks to a recent poster for both the design and links to the supplier of thermometers and other goodies) and the thickness of the door prevents tipping it much to get it in. A simpler and thinner door would be no problem I suppose. Careful about following my advice tho` because I lightly mortared my soldiers when starting the dome and it is pretty clear that was a bad idea. Les saved me from a redo by reminding me we weren`t building rockets here. I know I have to get pictures up and will try this week!
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  #20  
Old 08-26-2009, 09:41 AM
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Default Re: Texas 42

Good point. I'll make a mock-up of my proposed door and make sure it will fit
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