Re: Paul's 42" WFO - Canberra Australia
Finally found some more time to work on my oven and have completed the stand and poured the hearth slab today, photos attached.
Announcement
Collapse
No announcement yet.
Paul's 42" WFO - Canberra Australia
Collapse
X
-
Re: Paul's 42" WFO - Canberra Australia
Sorry Muscats,
Those calculations were for a freestanding arch without any support or load. For a dome its much stronger so you wont have to go 8.4". render and the
I get my material from "Johnny the oven man" who's on this forum. Much cheaper than Sydney field furnace.
I did cut a slot in the tube with the angle grinder. You only have to cut the inner tube and not do both like I did.( Then get yourself a wing nut and hey presto a accurate measuring guide. Also make sure your post stirup has a flush 90o angle as usually the are slightly curved as they are bent into shape. Use a grinder to make a small slice in the joint for this and check the angle level.
My insulation board comes friday so I have 2 days to make an executive decision on my dome and arch opening measurements. Pressure is on.
I'll post some pics when building.
Leave a comment:
-
Re: Paul's 42" WFO - Canberra Australia
Oh Greenleigh, nice area.
Sounds like we have both been to bunnings buying the same things. I got a swivel wheel there too, but i must have bought the a smaller one going on the price. I also bought a Post Stirup (the sought used for pergolas) to use for the right angel, it comes with a piece of pipe welded at right angles in the center.
I like the idea of the slot in the tubing, did you cut that with an angle grinder? I might copy your design and go with square tubing I have been trying to work with round but given that my tool will have bends in it I am finding it difficult to make the tool remain straight (i.e. on the same plane).
8.4" seems quite thick, thats almost a full brick? I suppose we get quite a bit of leaway with the holding strength of the mortar.
By the way, I took a trip to Sydney to Field Furnace to get my material.
Leave a comment:
-
Re: Paul's 42" WFO - Canberra Australia
Live in Greenleigh,
One thing you will always have is that slight hight difference to the width difference (around a inch or so) due to what type of swivel rotation axis point you fix to the floor. Ideally a door hinge which is obviously flatter then place a bearing so it can turn underneath. I found thats too much mucking about and got a $4.30 swivel wheel from bunnings which fits my 30mm steel tubing snugly. I used a square 25mm tube that slides inside from the pictures you can see I cut an old tap measure and glued it to the 30mm and measured from the inside edge of the "L" steel bracket ($5.00 from bunnings) which had to be grinded flush as the inner "L" was rounded. Measured to the centre of the swivel. Then cut the sides of both tubings so I could slot in a bolt and nut to maintain exact length plus my cousin wants to build a smaller oven when Im done so he can adjust the tool. I spayed it rust proof black so it doesn't seize up in the future.
The L bracket and tube piping and swill all have to be dead centre.
I can see what your saying I think in lowering the tool so it compensates for this. I think that its only a few cm's difference in my case that it wont matter to much plus any extra height greater than a semi circle turns into a parabola which is stronger. Im going for strength built to last rather than the shallower dome.
Someone did post a great link to informed article about dome and arches at
Auroville Earth Institute, training courses, workshops on Vaults, Arches, Domes(VAD), stabilized rammed earth walls, compressed earth blocks, vaulted structures, compressed stabilised earth blocks, rammed earth.
http://www.earth-auroville.com/maint...uctures-en.pdf
http://www.earth-auroville.com/maint...notions-en.pdf
In semi circle domes, their main concern is the horizontal thrust needs to be in the middle third of your brick dome to be strong.
The thickness of your dome walls needs to be in relation to the internal span. The thickness needs to be the span divined by 5 i.e. T = Span/5. so if you have a 42" oven span your brick dome should be 8.4" thick. Thats how I read it and if someone would like to confirm or check this.
PS. we have roo's that eat our back yard lawn and I wonder at the possibility of kangaroo toped pizza mmm yummy! They are looking at the oven curiously and I again wonder if they know my thoughts?
Leave a comment:
-
Re: Paul's 42" WFO - Canberra Australia
Originally posted by Muscats View Postthey where running out of the bush
Leave a comment:
-
Re: Paul's 42" WFO - Canberra Australia
Originally posted by tinaloven View Postg'day Paul
looks good so far. Im encountering the same dilemma. Id like to go for a shallow dome although some issues arrises as the overall strength diminishes as the dome gets lower. After some research. A parabola design is the strongest but as its more of a triangle its not very heat effective. So there is a trade of in the two designs. Ellipse is better at thermal mass but weaker dome Parabola is stronger but takes for fuel to heat and maintain. I guess thats why they go for the semi circle although very strong without any weight on it but brick ovens are load bearing so where do we stand at the design of the dome. Im in the same boat as you which way do I go? Im actually building one in Queanbeyan myself.
The idea if I lower the point for the tool means I should still get a perfect semi circular dome just not the full half its like slicing through the circle above the middle so that the distance from the slice to the top of the circle is less than the radius.
Originally posted by tinaloven View PostI've built my dome gauge with measurements so if I go for a shallow dome I can change the angle exactly with it.
Leave a comment:
-
Re: Paul's 42" WFO - Canberra Australia
Originally posted by brickie in oz View PostBut so much more sensible that Emus....
Leave a comment:
-
Re: Paul's 42" WFO - Canberra Australia
Originally posted by nissanneill View Postno brains or road sense,
Leave a comment:
-
Re: Paul's 42" WFO - Canberra Australia
g'day Paul
looks good so far. Im encountering the same dilemma. Id like to go for a shallow dome although some issues arrises as the overall strength diminishes as the dome gets lower. After some research. A parabola design is the strongest but as its more of a triangle its not very heat effective. So there is a trade of in the two designs. Ellipse is better at thermal mass but weaker dome Parabola is stronger but takes for fuel to heat and maintain. I guess thats why they go for the semi circle although very strong without any weight on it but brick ovens are load bearing so where do we stand at the design of the dome. Im in the same boat as you which way do I go? Im actually building one in Queanbeyan myself.
I've built my dome gauge with measurements so if I go for a shallow dome I can change the angle exactly with it.
my dome is large it's 1280mm about 50 inches. I went for a big build a) we have a big family and when we have get togethers its a very large gathering 2. we live on acreage with plenty of fuel. 3 I'm aiming to turn it into a business where I can produce breads, sun dried tomatoes etc and sell at various markets.
Im waiting on my insulation board and cooking tiles. (ordered from "Johnny the Oven Man") who has the best prices of all oven building material I found in Australia he 's in Melbourne and he delivers. So Ive marked out and cut my bricks which will lay on top of insulation then 300x300 cooking tiles.
Yes over engineered but better than under I always say.
But basically Im stuck on the dome, I want my oven to last 2000years (I wish)
Leave a comment:
-
Re: Paul's 42" WFO - Canberra Australia
I wonder how roo would go in the WFO?
Go for it but might I also suggest trying some smoked roo!
You can also use the oven for this, especially with a ready supply at hand.
Neill
Leave a comment:
-
Re: Paul's 42" WFO - Canberra Australia
Yeh;
problem is with all the rain over the last year they have had a population explosion and we are getting around 200 going through our paddocks everyday. You can see how green it is at the moment and all the females with joeys ready to leave the pouch, you can bet they all already have another one in there as well. I wonder how roo would go in the WFO?
Leave a comment:
-
Re: Paul's 42" WFO - Canberra Australia
Peskie little critters, aren't they!
I just delivered some colorbond roofing to a friend up in the Adelaide Hills and he has asked if I know suitable fencing contractors to install a 2metre chain wire fence around their house/garden plots just to keep the kangaroos out and save their fruit and veggies.
Wonderful animals, inquisitive, no brains or road sense, (as I have hit numerous ones with the 4wd out in the country), but wonderful symbols for Australia.
I have included an article in our Sunday paper from last week just for the visitors.
Cheers
Neill
Leave a comment:
-
Re: Paul's 42" WFO - Canberra Australia
Keep it going an you will be enjoying pizzas, breads and roasts for Christmas.
Cheers
Neill
PS Keep the pics coming, we all enjoy them!
Leave a comment:
Leave a comment: