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Old 08-21-2011, 08:30 PM
Peasant
 
Join Date: Jun 2011
Location: cairns
Posts: 25
Default Gauge or sand mold

I can't decide whether to use a gauge or a sand mold to shape my dome.
If using a gauge I imagine that you could really only do one course of bricks at a time allowing time in between for mortar to set. A sand mold looks to me like you could pretty much do the whole dome at once.
I'm not sure that I could get a good even shape using sand. The gauge method looks much more accurate.
Any advise would be greatly appreciated.
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Old 08-22-2011, 10:34 AM
Neil2's Avatar
Il Pizzaiolo
 
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: Gauge or sand mold

Or you could use a "fan" form system such as I did and as Terry did:

http://www.fornobravo.com/forum/f50/...tml#post118686 (My second Pompeii oven)


http://www.fornobravo.com/forum/f21/...ucer-3033.html (Flying Saucer)
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Old 08-22-2011, 10:43 AM
Apprentice
 
Join Date: Oct 2010
Location: Pensacola, Florida
Posts: 112
Default Re: Gauge or sand mold

My two cents - I used a piece of plywood (quarter circle) castored in the center. The only problem I can see using a mold is not being able to clean and properly mortar the inner seams and bricks. The homebrew sets pretty quickly, so I can't imagine a situation where you would need to slow down because of the gauge. I think you'll find keeping the inside of the dome clean as you go would be the better route.
Leigh
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Old 08-22-2011, 12:37 PM
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Default Re: Gauge or sand mold

You can't build your dome "all at once". It's pretty much one brick at a time.
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Old 08-22-2011, 02:06 PM
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Location: Townsville, Nth Queensland,Australia
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Default Re: Gauge or sand mold

building a sand dome is easier than it sounds. I've done three and getting the form right is quite easy. You need to have damp sand and simply tap the sides with the flat of a trowel and look at the profile by eye. A stck of the required height placed in the centre is useful to get the correct height. A few polystyrene boxes in the middle saves on sand.
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Old 08-22-2011, 02:50 PM
Journeyman
 
Join Date: Aug 2010
Location: Glendale, Arizona
Posts: 397
Default Re: Gauge or sand mold

Hello,

You can have the best of both worlds by starting with a plywood gauge then finish with a sand mold when you get near the top. Many have done it this way successfully.

Cheers,
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