Dome Model In Reality
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@d0me said:
Jeff, the reason i chose to do this in 6 parts is because someone told me that casting it in 1 piece may cause the dome to crack due to Expansion and Contraction due to the extreme heat the oven will produce.
Cracking on reasonably thick casting is most often from poor compaction. I doubt you have a vibrator handy but ...
@d0me said:
Also, the oven will probably be moved around and this could cause further damage to the dome but this may not be true. Maybe you can give me more insight?
Build one first ... in one hit ... no bung hole needed ... in a place it can stay in case you change your mind about moving it.
And think about the thickness. My one is about the same size but 80mm thick. It is made with clay, sand and some straw. It takes more than three hours to heat up and will still be warm the next morning. It is though encased in brick and has a granite pavior roof to keep out the weather.
As for the other questions I suggest you experiment. You can make most of what I suggest from offcuts or trash.
Then think about making another in segments ...
Chris
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@gaieus said:
OK, I see.
Well, in any case, D0me should now be able to remodel the whole thing in whatever variation!
Gaieus, with regards to the extent you have taken this lesson to, I can’t disagree.
Remodeling the dome differently shouldn’t be a problem at all though I may nudge you here and there for some assistance.@chrisglasier said:
Cracking on reasonably thick casting is most often from poor compaction. I doubt you have a vibrator handy but ...
ChrisA vibrator would come in handy, I see. Pity I don’t have some lying around the house. I probably would need to invest in one.
On a more serious note, what sort of light weight, inexpensive equipment would you suggest I use to vibrate the cement after it is mixed with water. I guess this will remove air bubbles and compact it further lessening the probability of cracks.@unknownuser said:
As for the other questions I suggest you experiment. You can make most of what I suggest from offcuts or trash.
I guess the best viable option for me at this time is to cast the dome in 1 piece as you have suggested.
As for experimenting, well that’s what I would be doing but keep in mind that this type of a project is costly. If my experimentation goes wrong, it will impact on me financially which I can’t afford to happen though I wish I had the funds to play around with a project like this. I would like to be prepared going forward. Once I have all the preliminary steps sorted, I guess the next steps will be pure experimentation that can’t go too wrong.I guess having a wooden spinner with various thickness options in 1 doesn’t seem doable but if you or anyone else has some idea, please enlighten me.
Also, what type of sand do you suggest I use to make the sand dome?
Lastly, how do I attach the dome to my floor of the stand which will be my concrete slab?BTW nice pics. Is that your oven?
The rest of the steps in my 13 step process seems fairly in order.
Thanks
Regards
D0me -
a vibrator isn't a joke.. it's a real tool used on many jobsites
http://www.amazon.com/b?ie=UTF8&node=552994you don't have to buy one as most equipment rental places will rent them for cheap (~$20-30 per day)
it wouldn't really work for you unless you used a mold or were pouring something somewhat level.. if you vibrated a dome built as chris is suggesting then none of the concrete would stay in place.. gravity would basically be amplified and all the mud would end up on the ground.
an alternative for smaller projects is using a regular drill.. turn it on then rest is against the forms.. or, tap the forms with a hammer (though don't rely on that method to fill all voids)
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@d0me said:
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As for experimenting, well that’s what I would be doing but keep in mind that this type of a project is costly. If my experimentation goes wrong, it will impact on me financially which I can’t afford to happen though I wish I had the funds to play around with a project like this. I would like to be prepared going forward. Once I have all the preliminary steps sorted, I guess the next steps will be pure experimentation that can’t go too wrong.
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Also, what type of sand do you suggest I use to make the sand dome?
Lastly, how do I attach the dome to my floor of the stand which will be my concrete slab?Why not keep the first one super simple and super cheap. Use clay and sand as I did. Use 50 mm of sand and firebrick as the base. (Concrete will blister (spald) under heat.) Draw circles on the brick base for the sand and the clay. Mark a small pipe with the height of the sand and finished top and stick vertically into the centre of the sand mould when it is sufficiently high. Make a curved screeder out of plywood. Hold the top of the screeder against the mark on the pipe and move with reference to the circle on the bricks and up and down if too short. This will work fine with sand but you will need to lightly press the clay to show the high and low points, then correct by hand or trowel. Of course making a spinner would be more accurate.
For the sand go to the beach or builders merchant and see what will stand firm when slightly damp.
Your dome will be fantastically heavy; it will stick to your base by gravitational stickion.
Bon chance!
Chris
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@unknownuser said:
a vibrator isn't a joke.. it's a real tool used on many jobsites
http://www.amazon.com/b?ie=UTF8&node=552994you don't have to buy one as most equipment rental places will rent them for cheap (~$20-30 per day)
it wouldn't really work for you unless you used a mold or were pouring something somewhat level.. if you vibrated a dome built as chris is suggesting then none of the concrete would stay in place.. gravity would basically be amplified and all the mud would end up on the ground.
an alternative for smaller projects is using a regular drill.. turn it on then rest is against the forms.. or, tap the forms with a hammer (though don't rely on that method to fill all voids)
I will keep the vibrator in mind. Whatever helps to do a better job is needed. Should I vibrate my cement after it is mixed? Also, what suggestions do you have for mixing the cement as I believe those commercial mixer can be expensive. Is there any cheaper economical method or make shift tool that one can use to mix the cement?
@chrisglasier said:
@d0me said:
...
As for experimenting, well that’s what I would be doing but keep in mind that this type of a project is costly. If my experimentation goes wrong, it will impact on me financially which I can’t afford to happen though I wish I had the funds to play around with a project like this. I would like to be prepared going forward. Once I have all the preliminary steps sorted, I guess the next steps will be pure experimentation that can’t go too wrong.
...
Also, what type of sand do you suggest I use to make the sand dome?
Lastly, how do I attach the dome to my floor of the stand which will be my concrete slab?Why not keep the first one super simple and super cheap. Use clay and sand as I did. Use 50 mm of sand and firebrick as the base. (Concrete will blister (spald) under heat.) Draw circles on the brick base for the sand and the clay. Mark a small pipe with the height of the sand and finished top and stick vertically into the centre of the sand mould when it is sufficiently high. Make a curved screeder out of plywood. Hold the top of the screeder against the mark on the pipe and move with reference to the circle on the bricks and up and down if too short. This will work fine with sand but you will need to lightly press the clay to show the high and low points, then correct by hand or trowel. Of course making a spinner would be more accurate.
For the sand go to the beach or builders merchant and see what will stand firm when slightly damp.
Your dome will be fantastically heavy; it will stick to your base by gravitational stickion.
Bon chance!
Chris
Simple it shall be. To be honest, I was getting ahead of myself. I explored all different oven options and chose the one that is of a "World Class" stature so to say. I failed to realize that I am a total beginner at this and should first wet my feet by doing it simple and easy at first before sinking all the way in as how professionals do it.
I still choose to use refractory cement. I will make a sand dome using a spinner screeder. I will do everything directly on the surface where it will stay. I will need this to be mobile as I don't have space to permanently place this and will bring it out as I need it.
Thanks for all the advice guys.
I guess I would have found myself in quite difficult situation if I chose to go the route I initially decided upon.
BTW keep the tips coming. If anything pops up, let me know.Regards
D0me -
It's been interesting to follow your "dome" model development. In reality, I would build this from clay... just do a google search for clay/cob/earth ovens and you will find enough info. chrisglasier posted already a good tutorial. Forget concrete and vibrator as renting a vibrator will cost you more than raw materials to a clay oven. Have to admit, refractory cement, could be easier to obtain in same areas than clay. I suppose it will work too - but with a extra cost.
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No rush but would be interested whether it is still in hand; let us know if there are problems you need help with.
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Here is a interesting link from a quick Goole search. Maybe some new info for you there http://www.fornobravo.com/forum/#pizza-oven-design-installation
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