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Old 08-23-2007, 09:13 AM
Wlodek's Avatar
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Join Date: Jul 2007
Location: England's Lake District
Posts: 134
Default To cast or not to cast?

Right, a brief report is in order.

I have been acquiring increasing amounts of bricks and collating a list of UK refractories suppliers (more than I thought).

Still thinking about casting the top part of the dome. Thoughts (lose!):
  • thickness of the cast - the material will be similar to the firebricks used in the bottom rows of the dome, so do I need the same thickness? This would make the cast half a brick thick, which seems a lot. But if I don't I won't have the same thermal mass as the original
  • cracking - will it be liable to cracking due to thermal cycling?
  • how think are the Forno Bravo cast ovens? In the photos they look 2-3", which is far less than half a brick
  • and also - the top part of the dome would be probably approx. 50cm (20") in diameter - is this not too big as a single cast?
  • or should it be cast thinner and additionally rendered from the outside? Would that change anything?
  • or am I talking rubbish and I should just follow the plans ... ?

Any advice, experience or suggestions, pretty please?

Best wishes,
W.
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Old 08-23-2007, 02:00 PM
wlively's Avatar
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Join Date: May 2005
Location: Spring Branch, TX 78070
Posts: 384
Default Re: To cast or not to cast?

Probably best to read this
http://www.fornobravo.com/forum/f28/...rill-2207.html (Casting Refractory - This is NOT a drill!)

and then ask ENZ since he is the only one I have seen do it. Now, I did cast my vent transition and a dome plug (approx 15" in dia and 3" thick). The material I used (KS-4) has held up great and am not worried about cracking at all, but it required a specific heat cure schedule. So you could not use it unless you cast pieces small enough to fit in an oven or had a friend with a very large oven/kiln.
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