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  #51  
Old 10-08-2013, 07:25 AM
Apprentice
 
Join Date: Sep 2013
Location: Brisbane Australia
Posts: 127
Default Re: New 36inch castable build in Brisbane

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Originally Posted by stonecutter View Post
I have two breaks, the vent area is independent of the oven and the outer arch. The vent arch does not need to be tied into either of the latter sections, it does not strengthen the arch, because it is self supporting.

Correct that if you have a direct connection between the vent arch and the oven wall it will draw heat, and a break will help slow that action down...I doubt that a 1/2"-1" break will stop conductivity completely though. Loss of heat without a break between the oven and vent might not be measurable but it certainly won't hurt anything by doing it. The greatest benefit to a break (IMO) is between the outer arch and the vent walls, because almost all finish material does not have refractory qualities.

As far as the vent being a heat sink, my view is that as soon as the heat that is radiated by the fire and stored in the masonry of the oven passes through the oven opening, it doesn't matter if it is absorbed the vent or the flue...it is lost to the oven anyway.
Thanks stonecutter,

I checked out your build. Its truly impressive! I don't know you manage to carve granite, its so hard. The look is fantastic. I can see your separation on both sides of the flue gallery, so will try and do this in my build.

Yeah, I don't think my aim is for perfect heat isolation, and I don't know how long heat will be retained for example slow cooking, or bread ... etc. It's just that if you plan for it you can you can reduce design downsides before building it in permanently. Efficiency and heat retention should be considered high on the list.
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  #52  
Old 10-08-2013, 09:48 AM
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Il Pizzaiolo
 
Join Date: Jun 2007
Location: South Carolina,USA
Posts: 1,880
Default Re: New 36inch castable build in Brisbane

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Originally Posted by brissie View Post
..... It's just that if you plan for it you can you can reduce design downsides before building it in permanently. Efficiency and heat retention should be considered high on the list.
Agreed. Which is why I said it doesn't hurt to add a break, since it has no structural impact or involve any additional planning outside of an inch or so more to the final front dimension.
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  #53  
Old 10-08-2013, 12:05 PM
Master Builder
 
Join Date: Jan 2013
Location: Tochigi Prefecture, Japan
Posts: 620
Default Re: New 36inch castable build in Brisbane

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Originally Posted by brissie View Post
Mikku,

I am just a guy that has used a lot of information from this great site. It's the people who support the forum, and answer questions, and been around a long time that have made this site what it is.

It don't matter how fast you can make an oven. As long as you have fun. And I am having fun, and don't mind sharing the build. I hope people like it. I think its all about sharing, not enough of this these days.

Me - I am the guy in the middle, flanked by my son and neighbour. Who may be looking at building an oven also.
Brissie,

You have a great attitude and a lot of abilities. It is fun just watching what you are doing. You must have been a pretty good plumber, carpenter and other tradesman along the way. I hope you son is picking up what you have learned during your lifetime.
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  #54  
Old 10-08-2013, 12:58 PM
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Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,756
Default Re: New 36inch castable build in Brisbane

Mikku,
Does this mean that you are now convinced of the economy of the sand mould method?
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  #55  
Old 10-08-2013, 01:16 PM
Master Builder
 
Join Date: Jan 2013
Location: Tochigi Prefecture, Japan
Posts: 620
Default Re: New 36inch castable build in Brisbane

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Originally Posted by david s View Post
Mikku,
Does this mean that you are now convinced of the economy of the sand mould method?
David s:
What the heck are you doing up at this ungodly time? Thought that only us nut cases in Japan are running on all cylinders at 4AM (or at least this is when my engine got started).

As for your question, judging by the build in this thread---It is hard to deny the economy of a sand mold method. But it is "all to do" with the craftsmanship put into the preparation! That is true for any style build though.

I might be "hard headed", but there is still a little pliability in what gray matter is left after being bombarded with alcohol molecules on a daily basis!
I call it "anti-freeze"!
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  #56  
Old 10-08-2013, 01:26 PM
david s's Avatar
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Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,756
Default Re: New 36inch castable build in Brisbane

Mikku,
It's now 6.23 am I've been up for about an hour.
Maybe you should try two alcohol free days a week. It works pretty well.
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  #57  
Old 10-08-2013, 01:53 PM
Master Builder
 
Join Date: Jan 2013
Location: Tochigi Prefecture, Japan
Posts: 620
Default Re: New 36inch castable build in Brisbane

Quote:
Originally Posted by david s View Post
Mikku,
It's now 6.23 am I've been up for about an hour.
Maybe you should try two alcohol free days a week. It works pretty well.
That is what I call coffee and water, but they are used in moderation!

Caffeine isn't good for your health, and too much water and you can drown. So have to be on the safe side and use in moderation!

So you are an hour ahead of us! Its 5:50 here now and been up since 3:45, hands are sore from using tye wraps to attach pex A tubing to rebar for a little floor heating job.
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  #58  
Old 10-08-2013, 01:56 PM
david s's Avatar
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Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,756
Default Re: New 36inch castable build in Brisbane

Brissie,
I just reread your thread and was a bit concerned when I read that you said the castable was a "bit spongy". I'm concerned that you may have used insulating castable instead of dense castable. If you used insulating castable it will take much longer to get heat into the oven. The density should be around 2000 kg/m3. Check your specs.on your product.
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  #59  
Old 10-09-2013, 01:33 AM
Apprentice
 
Join Date: Sep 2013
Location: Brisbane Australia
Posts: 127
Default Re: New 36inch castable build in Brisbane

Quote:
Originally Posted by david s View Post
Brissie,
I just reread your thread and was a bit concerned when I read that you said the castable was a "bit spongy". I'm concerned that you may have used insulating castable instead of dense castable. If you used insulating castable it will take much longer to get heat into the oven. The density should be around 2000 kg/m3. Check your specs.on your product.
Just checked,

Approx Weight Required for Casting ,kg/m3 = 2000
Bulk Density After Drying at 110°C kg/m3 = 2110

It is heavy, not like air filled insulation.
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  #60  
Old 10-09-2013, 01:38 AM
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Il Pizzaiolo
 
Join Date: Mar 2007
Location: Townsville, Nth Queensland,Australia
Posts: 4,756
Default Re: New 36inch castable build in Brisbane

Ok, that's correct. Sorry to worry you.
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