#21  
Old 09-24-2010, 05:38 PM
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Default Re: ThermoJax's 42 oven

I have cut a notch in the bottom of row 6 to start moving the ceiling downward. Everyone seems to have a 21 radius and a 19 ceiling, so even if I get an inch drop, it will be better than no drop in height. I wonder that since my tool is fixed in the center and would normally produce a hemisphere, instead of something like drseward's oven, since he used an offset tool that accounted for the lowering of the roof, could I just using the fixed center point, lower the tool for every course, to achieve the 2 inch drop?
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  #22  
Old 09-24-2010, 05:55 PM
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Default Re: ThermoJax's 42 oven

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Originally Posted by ThermoJax View Post
...could I just use the fixed center point, lower the tool for every course, to achieve the 2 inch drop?
Yes, that is one method used here so you'll end up with your desired dome height.

I were you I would remove a couple or three (or four) courses and start over. You should be able to easily pry each brick loose with a screwdriver or something.
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Last edited by fxpose; 09-24-2010 at 06:01 PM.
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  #23  
Old 09-24-2010, 06:20 PM
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Default Re: ThermoJax's 42 oven

Take it down and start over? I am really, really tempted. My new harbor freight multipurpose tool can really shave that expensive mortar, but I am on my third tub of pre-made fire mortar, which I am assured by a third party who I definetly the Man when it comes to hot things like boilers and kilns here in Jacksonville, better than homemade refmix. There are areas on the lower course that just kill me to look at them. On the other hand, I can just ignore the obvious and finish the dome tommorow...

hard to decide. My wife says this build is not going quickly or well. Mostly me standing around thinking.


Tom
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  #24  
Old 09-24-2010, 06:34 PM
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Default Re: ThermoJax's 42 oven

You'll have such steep angles there I don't know how structurally sound your dome will end up being, with a near flat dome top. I wouldn't do it.
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  #25  
Old 09-24-2010, 06:40 PM
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Default Re: ThermoJax's 42 oven

Well, the five courses so far seem strong, especially since they are almost brick on brick, the mortar being fairly even from inside to outside. I suppose that if I had used the tool earlier, that each course would have thicker outsides, flush insides. But I think that this course 6 with the notch cut out of the bottom will spread the force from courses 6-14 in the downward fashion that 1-5 require. Maybe i can continue shortening the tool, not have a super smooth roof, and get the heat down to a shorter level.

As always, everyone's advice is appreciated.


Tom
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  #26  
Old 09-24-2010, 06:48 PM
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Default Re: ThermoJax's 42 oven

I would not tear it out. A flattened dome is bueno, but you may have to cut a couple of wedge courses. Do not try and make it up all in one course, use several to get the height to where you want it.
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Old 09-24-2010, 06:50 PM
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Default Re: ThermoJax's 42 oven

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Originally Posted by ThermoJax View Post
... But I think that this course 6 with the notch cut out of the bottom will spread the force from courses 6-14 in the downward fashion that 1-5 require.
Actually, subsequent courses above that will create more lateral force than a downward force.
I would at least wait for others to chime in on this matter.
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  #28  
Old 09-24-2010, 06:53 PM
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Default Re: ThermoJax's 42 oven

Thank you. I do have to tell you that even my soldier course has some 1/4 inch gaps here and there, but it is the burning chamber, and so far, far away from the outer arch, that with judicious use of mortar here and there, perhaps ,I won't be my own worst critic over the years to come. My favorites are the second ovens for the builders. The second oven is apparently so much sweeter, as the builder has learned a thing or two about a thing or two.


Tom
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  #29  
Old 09-24-2010, 06:54 PM
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Default Re: ThermoJax's 42 oven

The reality of the forces involved is almost inconsequential for the mass and size. The thickness of the dome and the bond strength of the mortar allow a huge amount of leeway. This is the only reason that so many non-mason/structural engineers are able to build a dome structure. This is, in fact, the beauty of the FB design.
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  #30  
Old 09-26-2010, 05:58 AM
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Default Re: ThermoJax's 42 oven

The oven had numerous problems. Looking at the arch from the inside showed problems. The left side was doglegging left, not curving inward. Then, there was a number of joints lining up (apparently one of the causes of cracking later) and then there was the problem of the oven staying on a 20 degree slope. My soldier course was cut at a 20, and I cut a 5 degree angle on both cheeks, no bevel and no slope cut. So 6 courses up, it was still on the 20. I have doubts that the thing would ever close up.

So, I used my harbor freight multi purpose tool and took down a number of levels, as well as certain offending sections that had joints that lined up, and rebuilt. My contact here in Jacksonville who works on all things high heat tells me to use premixed mortar, so I have. It is expensive. Like in the ninety something dollar range for a tub. By Friday morning I had purchased my third tub (three trips) and was sure that this third tub would do me. Well, it is Sunday morning and after the rebuild, I have 7 courses complete (that includes the soldier course), and am out of mud. If I had mud, I am sure that I could finish the dome today. I guess I should just cut today, plus shave off grunge from the inside.

I would also like to sing the praises of that multi-purpose tool. It cut right thru the semi dried mortar. I think it would have kicked butt even on cured mud. I declared a "Dad Emergency" and drug my 11 yr old daughter and 14 yr old son out to help with the tear down. My daughter had to shave all the bricks that had mud on them. My son had to butter up the bricks and hand them to me. As you can imagine, they were thrilled. (not) I took the opportunity to put a slop cut on the last 3 courses and started using the "tool" as a guide, and now the oven seems to be back on track towards closing up. Obviously, this will not be a drseward oven. But, kay sara sara, what will be, will be.

Tom
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