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Kosmo's Q 05-12-2008 07:51 PM

Has anyone made there own casting of an oven?

gjbingham 05-12-2008 09:17 PM

Re: Casting?
What do you mean Kosmo? Casted an oven dome?

SpringJim 05-13-2008 03:18 AM

Re: Casting?
Yes, do some searches...castable refractory....Ed schmidt built his dome from pieces cast....and some of the ovens James sells are also cast I believe.

david s 05-13-2008 03:32 AM

Re: Casting?
I cast mine. I get away with it because my oven is small. Trouble is with a larger oven you will have uneven heat rise and therefore uneven expansion. So you then need to cast the dome in multiple pieces. This can be tricky for a one off design. The castable refractory is hard like concrete but never truly fired unless you fire it in a kiln and you need to go to 573 C to make the material change.

Kosmo's Q 05-13-2008 03:47 AM

Re: Casting?
David what size is yours?

david s 05-13-2008 03:50 AM

Re: Casting?
535mm diam interior.

dmun 05-13-2008 09:37 AM

Re: Casting?
Most builders in the US make their domes from firebrick because it's cheap, and widely available, and castible refractory is an expensive specialty item. This is oddly reversed in some other countries.

Kosmo's Q 05-13-2008 01:54 PM

Re: Casting?
I talk to 2 different places selling brick 1 told me $1 per brick (1600deg) adn the other told me not to use that because it could chip and flake. O the brick they wanted me to buy was $2 and rated at 3700 deg. I really don't see it getting up to more than 1200 deg on any given day.

dmun 05-13-2008 02:03 PM

Re: Casting?
The low duty firebrick are fine. They don't "spall", or chip. There is a world of trouble and expense with using castable. Even using it for the vent top has caused trouble for builders.

Just my opinion, others may disagree.

DrakeRemoray 05-13-2008 03:52 PM

Re: Casting?

Originally Posted by dmun (Post 32364)
Even using it for the vent top has caused trouble for builders.

I love my cast vent...but it cause me some heartburn when it broke in casting...

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