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  #21  
Old 12-11-2005, 01:14 AM
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Well after all that work, I have fired the oven a few times.

Last night, when we fired it up quite high, we could see some cracks where the bricks meet the "manifold". At night, you could actually see the fire inside through the cracks!! after having read Aikitarik's thread on "how much crack is too much crack", I have decided to completely ignore to cracks (particularly the one by the manifold) because I was going to cast the vent and seal that area up with more refractory concrete anyway...

Here are some picture of the mold I made to pour the vent:



and again:



and here is a picture after I poured the concrete.
The sidewalls started bulging out a bit, so I propped them up with a couple of fire bricks on either side.

Mario Natali likes this.
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  #22  
Old 12-11-2005, 01:21 AM
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And here are some pics of the vent mortared in place, from a few different angles:



and again from the top view:



and finally from the side view:



All that remains now (before I can start using the oven in earnest), is to pour a casting for the "top plate" which will hold the flue and start insulating this baby, using a 3" blanket and perlcrete. I'm a great believer in spending money on insulation! All in all, a fair bit of work to do, before we go live...
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  #23  
Old 12-14-2005, 11:22 PM
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Default Spring in New Zealand

KiwiPete,

Haven't heard from you for a while. How's spring coming along? I couldn't help notice the bulbs coming up around the oven. Frost and fog in Northern California, and it's time to prune the vineyard. Do you roast turkey or chicken for the holidays -- will the oven be ready to roast by then?

Keep up the great work. Are you going to use woven ceramic insulation? Do you get Insulfrax there?

Waiting on more photos of your cat...

James
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  #24  
Old 12-16-2005, 10:31 PM
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Default Dome shape and performance

Hi KiwiPete,

Congratulations on that nice looking oven!

Looking and the pictures of your dome, it seems to me that you went the low vault route which I like myself. Could you post a drawing of your dome profile, or vanes that you used to support it while laying bricks?

Since I am interested in building a 36" dome with 1/3 bricks too (3" wall thickness), I would like to hear from you some comments on how the oven performs. Can you reach high temperatures of 900F+ that are already achieved with 4.5" wall thickness?

Thanks,
Mike
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  #25  
Old 12-18-2005, 02:38 AM
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Hi Guys,

another update from Kiwi Country.

with regards to the questions:

James: Yes, I am using an insulating blanket. I have found a product called "Rockwool" that is rated to 650C, so should be OK. I'm have bought a blanket of this stuff which is 3-4 inches thick, so I should be "well" insulated with another 1-2 inches of perlcrete on top of that...

Don't think the oven will be ready for Xmas, and I still have lots to learn about fire management.

on another matter James, How much would it cost to ship a 55lbs bag of Caputo flour to New Zealand (cheapest shipping options possible..)

I'll post some more pics in a moment.


ljanmi2:

My dome profile is: 36 inch diameter, 15 inch height in the middle and the first row of bricks is 6 inches high.

Can't give you any feedback on temperatures yet, since I haven't tried to crank it up to the working temperature yet, until I have finished insulating the oven. As soon as I know, I'll post it.

For your interest: my brick size is 9 x 4.5 x 3 and I have used about 100 bricks to build both the hearth and the dome.

Here is a picture of my vane profile:

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  #26  
Old 12-18-2005, 02:42 AM
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Some more pics!

I have cast a top plate which holds the first part of the flue.

here is a picture of the mold:



and here is a picture of the top place mortared in place together with the rest of the flue:



and again :

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  #27  
Old 12-18-2005, 02:48 AM
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Have started on the insulation part.

I bought a blanket which is 3-4 inches thick and has a wire backing, so it is quite good to "shape".

I read on the Forno Bravo site a long time ago, that you can't have too much insulation, hence the super thick blanket.

here are some pics after I finished wrestling it in place (with wire etc to keep it all tight):



and from a different angle:

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  #28  
Old 12-18-2005, 03:02 AM
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Putting that blanket on was quite a mission!the "Rockwool" stuff is great but you don't want the fibres to get into your skin, because it irritates the hell out of it.

So there I was on a hot summers days, dressed in long pants, T-shirt and overalls and wearing rubber gloves, trying to fit this blanket. I think i lost about 5kgs in fluid during the course of the afternoon!

After I got it all on and shaped more or less the way I wanted it to be, I grabbed a piece of flashing approx 1 foot high and put that around the dome with a 1-2 inches gap between the flashing and the dome.

Then I poured perlcrete into the gap and tamped it down. The rest of the dome was covered by "gooping" it on by hand, as you can see in the pic:



the flashing doesn't go all the way around, so I will have to do it in 2 stages: Some more work for Monday or Tuesday!
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  #29  
Old 12-24-2005, 08:01 AM
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Thumbs up Great Job!!!!!

Will you be posting more pics when this is finnished? I'm curious to see how the front is finnished. Hopefully, if all goes well this summer, I will be building one in my small backyard.

Thanks,
Bruce.
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  #30  
Old 12-27-2005, 05:29 PM
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Sure Bruce,

happy to post some more pics.

I am now at the stage where all the insulation work (Rockwool blanket and perlite) is finished.

I gave it a few days to dry out out properly and here is the result:



and here is another shot from the backside:



I wanted to stoke a decent fire in there (for testing purposes) and so we did, later on in the evening. I didn't have any dough and didn't have any time either, so we "pretended" and got take-away pizza and ate it by the fire of the pizza oven...

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