Author Topic: So it begins ... (in NZ)  (Read 11440 times)

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Offline shuboyje

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Re: So it begins ... (in NZ)
« Reply #25 on: February 14, 2013, 10:50:16 PM »
Personally, I think the cast iron door opening of the Italian ovens is both a crutch and a huge heat sink.  Build a firebrick arch and include a thermal break between it and the entry for maximum efficiency.
You can't beat the access to the oven though.

I agree with both of you thats why I spent so much time during my design and research coming up with a compromise that would give the access I wanted with a design I could live with thermally and structurally.  I personally am very happy with my result, but understand the door casting was a pretty major undertaking that many don't want to do.  In the past I've thought about offering forms or completed castings to help others, but it just doesn't work on so many levels.
-Jeff


Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #26 on: February 14, 2013, 10:59:58 PM »
Personally, I think the cast iron door opening of the Italian ovens is both a crutch and a huge heat sink.  Build a firebrick arch and include a thermal break between it and the entry for maximum efficiency.

I understand what you're saying. It's just that with my last oven the dome/opening transition gave me so much trouble that I ended up casting a vent, but looking back at it, wasn't really happy with that either.

I suppose I'm just a "crappy" mason.. Hence looking for a different solution.


Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #27 on: February 14, 2013, 11:02:47 PM »
In the past I've thought about offering forms or completed castings to help others, but it just doesn't work on so many levels.

Funny you say that Jeff, because some time ago, I had been toying with the idea of asking you for a copy of your moulds..

But understand about it not working on many levels (e.g. like sending a completed casting by Fedex to NZ.. shudder...$$$$)


Offline Tscarborough

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Re: So it begins ... (in NZ)
« Reply #28 on: February 14, 2013, 11:08:20 PM »
A cast refractory arch/vent is not the same as a cast iron door that the Italians use.

Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #29 on: February 14, 2013, 11:23:44 PM »
Personally, I think the cast iron door opening of the Italian ovens is both a crutch and a huge heat sink.  Build a firebrick arch and include a thermal break between it and the entry for maximum efficiency.

Apart from the reason mentioned before, I quite like "fagilia's" steel door because he leaves a gap between the door and the actual dome, so that you can stuff some fibre blanket in between and alleviate a lot of the thermal problems.



Offline TXCraig1

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Re: So it begins ... (in NZ)
« Reply #30 on: February 15, 2013, 08:29:35 AM »
Apart from the reason mentioned before, I quite like "fagilia's" steel door because he leaves a gap between the door and the actual dome, so that you can stuff some fibre blanket in between and alleviate a lot of the thermal problems.

What are the thermal problems?
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Offline dineomite

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Re: So it begins ... (in NZ)
« Reply #31 on: February 15, 2013, 08:31:41 AM »
Are you using anything to buttress the sidewalls? I used a sailor course on mine just because I didn't like the idea of the lateral stress on that joint that sits between the soldier and the piece that angles to the dome. With such a flat profile to the dome, I'd be concerned about there being some sheer on that joint since the majority of the stress is outward and not downward.

I understand that a sailor isn't really an option for you since the length of the brick is non-negotiable, but that's a pretty severe angle.

Offline Tscarborough

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Re: So it begins ... (in NZ)
« Reply #32 on: February 15, 2013, 09:28:15 AM »
Transference of heat through the metal.

Offline TXCraig1

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Re: So it begins ... (in NZ)
« Reply #33 on: February 15, 2013, 09:49:43 AM »
Transference of heat through the metal.

If you were solely concerned with residual oven heat, it might be a concern. For baking pizza, the heat loss is trivial. It's a small price to pay for unfettered access to the oven.


"We make great pizza, with sourdough when we can, commercial yeast when we must, but always great pizza."
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Offline Tscarborough

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Re: So it begins ... (in NZ)
« Reply #34 on: February 15, 2013, 10:10:20 AM »
I agree, but I like the residual heat capability.

Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #35 on: March 24, 2013, 09:45:59 PM »
It has been a while, but I had to wait for my entry door to be fabricated.

So here are some more pics  of where things are at now.

There seems to be some variation of thickness of the hearth bricks. Not much, but up to 2 mm, so will have to try and level it all when I set the hearth bricks on the perlcrete.

They also have a bit of a sharp edge/lip, so I"ll sand the edges, so that they are a bit smoother.



Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #36 on: May 06, 2013, 07:12:48 PM »
Update.

Its been slow going because I have lots of other things to do on the house at the same time.

Hearth brick cut and using sand, placed and leveled on the perlcrete base.


Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #37 on: May 06, 2013, 07:15:07 PM »

Sailor course in place.

I'm mixing regular brick with angle shaped ones, to keep the gaps to a minimum. Also, to save on the very expensive refractory mortar...

Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #38 on: May 06, 2013, 07:17:06 PM »

Entry door in place.


Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #39 on: May 06, 2013, 07:19:37 PM »

Mortaring the sailor course extension bricks (angled) in place.

Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #40 on: May 06, 2013, 07:21:14 PM »

Filling in the gaps between the entry door and the bricks.


Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #41 on: May 06, 2013, 07:23:22 PM »

Back of entry door arch completed with perlcrete.



Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #42 on: May 06, 2013, 07:28:29 PM »

Need to fill the oven with sand, but it would take a lot of sand to fill the thing with (something like 20 bags) which would cost way too much.

So my wife came up with the idea of filling it up with logs of firewood. Brilliant idea!


Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #43 on: May 06, 2013, 07:30:04 PM »

Sand form completed..


Offline Serpentelli

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Re: So it begins ... (in NZ)
« Reply #44 on: May 06, 2013, 09:58:47 PM »
Looks awesome. Really. That door is GREAT.

How do you get the logs out at the end?

John K
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Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #45 on: May 06, 2013, 11:01:56 PM »
How do you get the logs out at the end?

They all come out through the door.. Even the big one to which the steel rod is bolted.

Offline Serpentelli

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Re: So it begins ... (in NZ)
« Reply #46 on: May 07, 2013, 08:04:22 AM »
They all come out through the door.. Even the big one to which the steel rod is bolted.

The only reason I ask is because its exactly the type of thing that would have led me to an "Oh $h!&" moment after the dome was done...if I ever tried to make such a thing....

I'm impressed. Very much so.


John K
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Offline Jackie Tran

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Re: So it begins ... (in NZ)
« Reply #47 on: May 07, 2013, 08:09:22 AM »
Looks awesome so far.  I'm jealous!  ;D

Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #48 on: May 26, 2013, 05:06:58 PM »
Some more updates - slow progress because we're heading into winter.


Offline kiwipete

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Re: So it begins ... (in NZ)
« Reply #49 on: May 26, 2013, 05:13:12 PM »
Dome is finally finished and steel cable attached.

Removed all the logs and most of the sand (there is still a bit to go as you can see in the last pic) and was praying that the dome wouldn't cave in. I was reasonably confident it wouldn't but its still a tense moment.

The last shot shows the inside but unfortunately no picture of the quality (or lack thereof) of the dome brickwork. I decided to cover the sand form with damp newspaper because I didn't want any sand sticking to the mortar (it might drop onto a pizza later at some stage). And the newspaper will just burn off when I start firing / curing the oven.

Now onto insulation and then curing..



« Last Edit: May 26, 2013, 05:14:56 PM by kiwipete »


 

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