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  #31  
Old 02-11-2012, 10:39 AM
Neil2's Avatar
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Default Re: 39" Stargate Pompeii

"I guess I can make two mixes at once"

This is what I do. Two mixes, one for the narrow part of the joints and one for the wider parts. This also minimizes cracking.
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  #32  
Old 02-13-2012, 10:01 AM
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Post Re: 39" Stargate Pompeii

During some breaks in the rain I managed to get the arch built. I think it is best to start with the arch. The dome should fit to it unless something goes seriously wrong as I was able to use the IT as a guide for the arch by turning the head slightly - up to a 1/4 turn in each direction which is negligible difference to the radius used for the rest of the dome construction. I did mix two batches and that worked out Ok. I had to make the mix wetter tham I expected.
Mu keystone looks a little dinky. I had to slice my last brick in two, The mortar joints were a bit thicker than I expected.

Heres a few pics - front, rear, and top view (which show up my bad cuts. Then I had to cover for rain. We are lucky with weather though. Even Rome is covered in snow. Rugby was cancelled in Paris as pitch was frozen.
I laid a few of the soldier course later.

BTW when I was cutting a few extra arch bricks I realised (too late for this oven) I could have done with much fewer cuts. I cut each brick for the arch with 3 cuts. With the new method I could have cut two arch bricks with just three cuts - and reduced wastage.

Thers's a free pizza (by stargate delivery) for the first correct answer to that puzzle Solution will be posted at the end of the build.
Amac
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39" Stargate Pompeii-photo0290.jpg   39" Stargate Pompeii-photo0289.jpg   39" Stargate Pompeii-photo0288.jpg  
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  #33  
Old 02-14-2012, 10:54 AM
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Default Re: 39" Stargate Pompeii

Weather is holding up nicely, just a bit cloudy and about 7 or 8 C so I finished the 1/2 brick soldier course. I wouldn't like to do anything more than a 1/2 brick - those side joints are awkward. Also started on course 1 of the dome proper. This is where both the 10.5" arch and 39" dome begin - 1.5" above the floor.. I added the clamp attachment to the IT, having removed the arch "block" from it. So far so good and nothing unexpected.

No takers on my "arch cut" puzzle? - so I have include a pic of how I did the three cuts for the existing arch. A clue is that the new cuts will result in a slighly bigger arch brick that would still fit my dome and arch perfectly with no change to the arch radius
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39" Stargate Pompeii-photo0291.jpg   39" Stargate Pompeii-photo0292.jpg  
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Last edited by Amac; 02-14-2012 at 11:00 AM.
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  #34  
Old 02-14-2012, 01:50 PM
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Default Re: 39" Stargate Pompeii

Ah, shucks Aidan! I thought you meant two cuts for two arch bricks! I really wanted that pizza! My bad!
John
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  #35  
Old 02-14-2012, 02:14 PM
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Default Re: 39" Stargate Pompeii

Good try Gianni - I guess I should have said "straight cuts". I would have killed myself trying to cut those with the kickback from my cutter

Also the horizontal line only looks like it is at the centre of the bricks. In reality the arch brick extends slightly past halfway. The solution is on the back of the brick.
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  #36  
Old 02-15-2012, 01:22 PM
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Default Re: 39" Stargate Pompeii

Good to see you making progress Aidan. I've been waiting to see how your arch-dome transition turns out.

You could have got 2 arch bricks out of a single brick with the 3 cuts in my attachment - green cut first. The angles are slightly different but it would probably still work.

Keep up the good work.
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39" Stargate Pompeii-3cuts.jpg  
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  #37  
Old 02-15-2012, 02:19 PM
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Default Re: 39" Stargate Pompeii

perfect Sharkey - what's your favourite topping?
It would have saved me (and my blade) some work and I did want to have a slightly thicker opening, It narrows to around 3 1/4" at the opening. Just let me flip the brick. There - I actually drew that using the same wooden jig which I used to cut the arch bricks - just slid it towards the middle.

The two non 90 degree angles are a function of the dome/arch combination. In mine they work out at 135 and 145 degrees to make up the 540 degrees of the pentagon. Of course there is no need to work out all those angles. They will just happen once you draw it out as I have shown in the second pic. Better to do it on a full scale.

BTW there was something you had said back on Aceves thread - that the IT would no longer grip the bricks if I change the radius towards the top of the dome. After thinking a bit more on it I think it should work as normal. Just the rows will tilt in a bit more.

Quote:
Good to see you making progress Aidan. I've been waiting to see how your arch-dome transition turns out.
Well other than bad or careless workmanship (and I've already had my share of that) - I can't see how it can go wrong, and it should, if my theory is correct, follow the internal curve of the dome naturally - without any "reaching"

Btw I am awaiting activity on the "rock and hard place" thread. How is it going?
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39" Stargate Pompeii-photo0293.jpg   39" Stargate Pompeii-photo0269.jpg  
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  #38  
Old 02-15-2012, 05:07 PM
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Default Re: 39" Stargate Pompeii

Quote:
Originally Posted by Amac View Post
perfect Sharkey - what's your favourite topping?
They're all good. I haven't had a bad pizza out of these ovens. For something different I like dessert pizza's ala Karangi Dude.


Quote:
Originally Posted by Amac View Post
BTW there was something you had said back on Aceves thread - that the IT would no longer grip the bricks if I change the radius towards the top of the dome. After thinking a bit more on it I think it should work as normal. Just the rows will tilt in a bit more.
In the (very) rough diagram attached:

The IT is the blue thing.

The green square is the position of the next brick if you did not shorten the IT. Note it aligns with the IT.

The Red square is the adjusted position of the brick with a shorter IT. The corner at 'A' must remain in the same position and you tilt the brick inwards. It will still work out, it just doesn't sit squarely in the IT anymore because you have changed the angles. Each subsequent adjustment means it will be further out of alignment.


Quote:
Originally Posted by Amac View Post
Btw I am awaiting activity on the "rock and hard place" thread. How is it going?
I haven't done any work on it for months. We have had the wettest summer for a long time and there is water seeping out of the rocks. I need to do some serious drainage work when it finally stops raining and dries out.
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39" Stargate Pompeii-shortenedit.jpg  
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  #39  
Old 02-16-2012, 03:49 AM
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Default Re: 39" Stargate Pompeii

Quote:
The Red square is the adjusted position of the brick with a shorter IT. The corner at 'A' must remain in the same position and you tilt the brick inwards. It will still work out, it just doesn't sit squarely in the IT anymore because you have changed the angles. Each subsequent adjustment means it will be further out of alignment.
Of course - I'm an idiot wipe that.

Quote:
We have had the wettest summer for a long time
Here - in the middle of winter - the weather is exceptionally mild (last year it was down to -15C) but constantly threatening rain and often delivering - so I get to build in between showers. This is a retirement project for me so I have time to think and read the forum, (and contribute rambling incoherent posts)
Quote:
I need to do some serious drainage work when it finally stops raining and dries out.
I suspect I will also need to do some remedial drainage works later as I rushed into laying my slab on ground behind a retaining wall which slopes towrds the slab.
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  #40  
Old 02-16-2012, 11:56 AM
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Default Re: 39" Stargate Pompeii

Row 1 finished - started the 2nd row. I can see the dome to arch cuts getting increasingly difficult - more difficult to mark than cut. I don't have any system for marking the awkward ones so far - just "eyeballing" as you say here, and hope for the best. I bet some "brickie" has a few tricks of the trade?
I realised that I should have made the centre piece of the IT a triangle rather than a square. I noticed, late as usual, it was drifting on me yesterday, so there are a few on the first row a few millimetres out of line. Not worth fixing though.
It is about time I gave some thought to the vent, chimney, and whether I should go for igloo or gabled enclosure. I like the igloo look but I don't think it could easily be made resistant to our weather so I don't think I have a real choice. I like Sharkeys large vent - but I think I will make the vent area shallower. Would 4.5" by say 8" or 9" be too small?
Amac
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39" Stargate Pompeii-photo0297.jpg  

Last edited by Amac; 02-16-2012 at 12:11 PM.
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