#11  
Old 11-09-2011, 12:30 AM
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Default Re: First time oven build

Hi All, I have now cast the dome 115mm thick

[ATTACH]27492
here is the pic
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First time oven build-img_0815lr.jpg  
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  #12  
Old 11-09-2011, 12:37 AM
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Default Re: First time oven build

That is a pretty thick dome for a casting and it will take ages to dry. don't attempt to fire it for two or three weeks, so the weather can dry it for you. Water trapped in the middle of the walls will blow them apart if it turns to steam suddenly.Follow the manufacturers recommendations for initial firing, nothing more than 25 C increase / Hr from memory.It varies depending on the thickness. Presuamably you didn't add fibres to assist with the water elimination so you must take it really easy, otherwise you are bound to get cracking or blowing ( oops, I see it's cracked already. Plug it up with some more of your mix.

Last edited by david s; 11-09-2011 at 01:01 AM.
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Old 11-09-2011, 02:29 AM
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Default Re: First time oven build

megapulse
i have been looking at the photos
have you recessed the fb board into the slab?

regards dave
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  #14  
Old 11-09-2011, 12:57 PM
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Default Re: First time oven build

Hi friends
Yes the fire board is recessed
The crack is not a crack but a cut which I made in both directions approx 50 mm deep. Thanks for the tip I am emptying it today of the sand.
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  #15  
Old 11-10-2011, 03:17 AM
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Default Re: First time oven build

Ok friends we have an oven, next the fire blanket andy chimneyFirst time oven build-img_0821.jpg
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  #16  
Old 11-10-2011, 04:11 AM
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Default Re: First time oven build

Megapulse,
If I were in your situation I'd be making a 4"x4" brick mould and pack it firmly with the dry mix you used for the dome, remove it and weigh it,then oil the surface of the mould and add water to the mix and make your brick. You can then leave it in the sun and weigh it each day to give yourself an idea of the rate of water loss. You can then use this information to decide when it is safe to start firing. The water in the middle is going to leave last and is the most problematic.
Dave
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  #17  
Old 11-10-2011, 10:51 AM
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Default Re: First time oven build

Quote:
Originally Posted by Megapulse View Post
Yes the fire board is recessed
With the fire brick hearth touching the stand as they are the heat will wick away and have a cooling effect on the oven.
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Old 11-10-2011, 12:12 PM
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Default Re: First time oven build

From your photos it appears that the floor is fully insulated but the base of the dome is sitting on the supporting slab. It should have been insulated, but don't worry too much your setup will work fine, but you will lose some heat by conduction from the dome to the concrete if this is the way you have done it.
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Old 11-10-2011, 03:54 PM
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Default Re: First time oven build

Megapulse - I like your style and way of thinking - well done.........
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Old 11-10-2011, 09:55 PM
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Default Re: First time oven build

nice oven well done. Keep the photos coming I'ld love to see the finished oven.
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