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  #121  
Old 04-22-2012, 05:48 AM
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Default Re: Oven on wheels

Got another ring of bricks on. More after dark photos, unfortunately.
Two or three bricks aren't as aligned as I'd like. I may re-do those tomorrow.
I now only have a 30cm circle to fill.
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  #122  
Old 04-22-2012, 06:50 AM
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Default Re: Oven on wheels

Wow now that's what you call a "double soldier" course......gotta be proud of that.
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  #123  
Old 04-23-2012, 04:05 PM
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Default Re: Oven on wheels

Hey Damon.
I was just about to finally confess I had no idea what the heck a "soldier course" is, when I chanced to read Dave's last post on your 2nd build thread. So. I've got a ring of vertical bricks surrounding my cooking floor. This is a soldier course? I wasn't quite sure. It appears its not the conventional way to do it these days, but I'm reasonably hopeful that by the time I add the inch of render over the outside of the whole dome, it'll all be stable enough to withstand heating and cooling. It probably looks wrong too, from the point of view of going down to the concrete slab, but my slab is made with scoria. According to the academic paper I got the mix from, it has a slightly better insulating value than vermicrete made 3:2:1 with vermiculite sand and cement.
By the time I add the render, it'll be 3 inches thick, with a 2 inch thick cooking floor. This seems to fit with the ratios of thermal mass that FB uses in their ovens, so I reckon it'll work. Its not raining this morning, so today is "close the dome" day.
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  #124  
Old 04-24-2012, 12:52 AM
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Default Re: Oven on wheels

Its actually a sailor course.
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  #125  
Old 04-24-2012, 01:46 AM
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Default Re: Oven on wheels

......ahhh I get it (just did wiki) soldier and sailor are BOTH vertical terms

So does that mean when you shoot a sailor/soldier he ly down so out comes the stretcher
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  #126  
Old 04-24-2012, 02:27 AM
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Default Re: Oven on wheels

Ah! I just wiki'd it too. I see it is meant to only be decorative. OOPS! Ah well, I'm not trying to hold up a two story building with it.
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  #127  
Old 04-24-2012, 02:49 AM
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Default Re: Oven on wheels

Gudday
I'm not a trendy either I've got an out of date oven ...its got a soldier course.
Point is that more ovens now tend to get built with the first course on the hearth itself. The soldier course was popular because it allowed you suposedly to replace any cracked hearth stone easily...guess what no one seems to need to do this. Easy method.... makes the cuts on the hearth edge easy as they don't need to be super accurate. First layer of bricks are then layed on there sides so there aren't as tall and possibly not as prone to sidward thrust.

Regards Dave

Last edited by cobblerdave; 04-24-2012 at 02:53 AM.
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  #128  
Old 04-24-2012, 03:24 AM
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Default Re: Oven on wheels

I always thought the idea of having the first course vertical was to allow you to have things in the oven right up to the wal to maximize floor area. To my mind running bricks vertically is encouraging cracks as they tend to always run vertically from the bottom.
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  #129  
Old 04-24-2012, 07:02 AM
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Default Re: Oven on wheels

Quote:
Originally Posted by david s View Post
To my mind running bricks vertically is encouraging cracks as they tend to always run vertically from the bottom.
Oh dear. Despite reading lots on this forum, I didn't absorb that bit. Then I laid the sailor course thinking I was going to make the rest of the dome as a one piece casting. I changed my mind and kept going in brick, but I now realise that laying them thin edge to thin edge wasn't smart, its probably too thin for strength. This is the downside of changing your mind halfway through. I believe I will clad the dome in mortar/concrete before firing it, to try to improve the strength. I believe that I will sleep better if the cladding has reinforcing in it, too. Still pondering all that.
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  #130  
Old 04-24-2012, 03:24 PM
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Default Re: Oven on wheels

I think you'll be fine. I really like the simplicity of your build. I agree with the idea of some reinforced cladding. Go for it. If it were mine I think I'd go for home brew with stainless steel (melt extract fibres) reinforcing.

How thick are your walls now?
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