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  #21  
Old 09-08-2011, 07:02 AM
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Default Re: Mobile Hand-Formed Dome Oven Build

We did a test build, using a standard concrete mix, to see if hand casting the refractory layer was feasible. In my opinion, it is not. The refractory material is expensive and I have little control in preventing gravity from fattening the bottom of the layer toward the floor. A form is definitely needed. In that regard, this link is inspiring: http://www.fornobravo.com/forum/f28/...rill-2207.html (Casting Refractory - This is NOT a drill!)
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  #22  
Old 09-08-2011, 07:52 AM
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Default Re: Mobile Hand-Formed Dome Oven Build

If you mix the castable up withbthe correct water content it will be stiff enough to stand up vertically. It does it better than a normal concrete brew would. It can be done without an outside mould, but you can't vibrate it or it will slump. With care you can create a good dome in one piece with very few voids.
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  #23  
Old 01-09-2012, 08:26 AM
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Default Re: Mobile Hand-Formed Dome Oven Build

"to see if hand casting the refractory layer was feasible. In my opinion, it is not".......Looks pretty good to me, especially for a first attempt.
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  #24  
Old 01-26-2012, 03:54 PM
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Default Re: Mobile Hand-Formed Dome Oven Build

to see if hand casting the refractory layer was feasible. In my opinion, it is not".......


looks darn good to me shoot if that was refrac crete i would be cooking in it now....
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  #25  
Old 03-11-2012, 07:48 AM
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Default Re: Mobile Hand-Formed Dome Oven Build

Overkill is understating it.

Finally finished with the form for the refractory layer. A couple finishing touches, and it's time to pour.

If I ever build another one (hoping so), I think I'll use sand for the inner form. The inner form will be sacrificed after the pour. The outer form might be reusable.
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  #26  
Old 04-28-2012, 09:43 AM
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Default Re: Mobile Hand-Formed Dome Oven Build

wow, that's a work of art on it's own. Shame to get it dirty, How is the door/entrance to be formed
? Good luck and good work.
See my build at http://www.fornobravo.com/forum/43/f...day-16182.html and http://www.fornobravo.com/forum/43/f...ild-17613.html
If I can help in any way please don't hesitate to contact. Thank you
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Last edited by sonomacast; 04-29-2012 at 11:44 AM.
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  #27  
Old 04-28-2012, 02:28 PM
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Default Re: Mobile Hand-Formed Dome Oven Build

Wow, that's hours and hours of work to make a mould. i don't think the effort is worth it for a single casting and a timber mould really takes a beating every time you make a casting, so it doesn't last too long for multiple castings.
Make sure you use some kind of release agent and vibration when you place the mix.
A small orbital sander without the sandpaper does a reasonable job for this.
Also don't mix up more than one 25 Kg bag at a time because the stuf goes off pretty quickly.Use chilled water if it's a hot day.
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  #28  
Old 04-29-2012, 07:25 AM
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Thumbs up Re: Mobile Hand-Formed Dome Oven Build

Quote:
Originally Posted by sonomacast View Post
....snip....How is the door/entrance to be formed
? Good luck and good work....snip....
Sonomacast, you are so tactful.... Rasorface, you need to save that mold for me, its a work of art like David s says
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