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  #21  
Old 09-16-2009, 02:32 PM
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Default Re: My Cast Refractory Oven Build

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Originally Posted by david s View Post
I would be making sure that the dome sat on top of the floor rather than the floor inside the dome, otherwise your ratio will be out further. Some mortar between the dome and the floor will also help to get closer to the ideal ratio.
but my door opening will also change...
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  #22  
Old 09-16-2009, 08:24 PM
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Default Re: My Cast Refractory Oven Build

I think a door that is too low/short is better than too high...
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  #23  
Old 09-16-2009, 10:43 PM
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Default Re: My Cast Refractory Oven Build

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I think a door that is too low/short is better than too high...
Drake
but being an inch too low, will it prohibit good air exchange?
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  #24  
Old 09-17-2009, 01:36 AM
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Default Re: My Cast Refractory Oven Build

Joey,
To further explain what I meant, take these three situations (let's say your floor is 3")

1. Dome on top of floor
9.75 div 17.25 = 56.5%

2. Floor inside dome
6.75 div 14.75 = 45.8%

3. Dome on top of floor with 1" mortar between them
10.75 div 18.25 = 58.9 %
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  #25  
Old 09-17-2009, 03:53 AM
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Default Re: My Cast Refractory Oven Build

Quote:
Originally Posted by david s View Post
Joey,
To further explain what I meant, take these three situations (let's say your floor is 3")

1. Dome on top of floor
9.75 div 17.25 = 56.5%

2. Floor inside dome
6.75 div 14.75 = 45.8%

3. Dome on top of floor with 1" mortar between them
10.75 div 18.25 = 58.9 %
What %age is 'optimal'?
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  #26  
Old 09-17-2009, 04:25 AM
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Default Re: My Cast Refractory Oven Build

My belief is that it is the golden ratio ie. 1:1.618
which is 61.8%, but history says the ancients used 63% which is practically the same.
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  #27  
Old 09-17-2009, 06:46 AM
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Default Re: My Cast Refractory Oven Build

Quote:
Originally Posted by david s View Post
Joey,
To further explain what I meant, take these three situations (let's say your floor is 3")

1. Dome on top of floor
9.75 div 17.25 = 56.5%

2. Floor inside dome
6.75 div 14.75 = 45.8%

3. Dome on top of floor with 1" mortar between them
10.75 div 18.25 = 58.9 %
cool, so just raising the entire thing 1" above the floor will get me alot closer. that is an easy fix!
thanks.
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  #28  
Old 09-17-2009, 06:50 AM
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Default Re: My Cast Refractory Oven Build

now, if i raise it 2" above the floor...
11.75 div by 19.25 = 61.08% which is almost perfect!
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  #29  
Old 09-17-2009, 01:49 PM
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Default Re: My Cast Refractory Oven Build

You could assemble your mould again and cast a 2" high piece.
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  #30  
Old 09-17-2009, 03:17 PM
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Default Re: My Cast Refractory Oven Build

Molds were a one time use. How wide are fire bricks?
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