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  #71  
Old 08-26-2013, 11:42 AM
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Post Re: 82cm Corner Underway in Bulgaria

Paul

If you will get your IT set, it will greatly aid in your setup and alignment of your arch template. You will want to put a brick in the IT and test the top of the arch template. See Russell's #38 and my #41 on your thread. Those should be looking familiar to you now.

Also, you need to decide how you will build your vent and flue. Will the chimney rest on your inner arch or be separate?

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  #72  
Old 08-26-2013, 12:28 PM
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Default Re: 82cm Corner Underway in Bulgaria

Hi Tex, I will put the board back in tomorrow with the IT and start looking at the arch formation its a little clearer now but I must overcome the problem of large gaps/ cutting my bricks to shape or I may use wedges between each course as I go round.
Undecided yet but may have time to have a good scratch of my head in the morning.

Yes I intend to rest the flue on the inner arch and outer arch(hopefully) going by what Ive seen, when the arch is done there will be 9inches of front brick which you can see in the photos plus whatever room is left on the arch bricks. If you get my drift.
Will look at those threads you mentioned Tex.

Cheers Paul
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  #73  
Old 08-26-2013, 12:32 PM
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Default Re: 82cm Corner Underway in Bulgaria

Quote:
Originally Posted by yorkshireknight View Post
!st Row completed.
I noticed when I put the arch template back it doesn't quite match with the edge of bricks can this be rectified on the next course?

To make my hemispherical arch do I start turning the bricks in at this point, I have noticed others turn after the 2nd course?

Cobbler Dave, thanks for the tip will look at this method if its not a detriment to doing what Dennis, chip and Octo etc have done. Your idea was done on the outside arch but maybe it will work on the inside too.

Thanks Dennis, I see that you went through a similar problem although you had the right tools for the job to cut angle your bricks for the arch.
Wrap the top of the arch template in a thin sheet of tin, the inside edge of the template is of no concern, get some shims under the template before continuing your arch also. The shims can be removed easily and the template will come out without any major issues once dropped.
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  #74  
Old 09-01-2013, 01:26 AM
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Default Re: 82cm Corner Underway in Bulgaria

I think I've made a little progress in the understanding of building my arch and many thanks for your help guys. Please take a look and let me know if I'm proceeding OK.
Looking at my arch ends (on photo) they are slightly of different dimensions somehow, will this prove a problem as I go round?

I have had a go at tapering a few bricks with the angle grinder for the arch its hard work but I'm managing although they don't look pretty Im pretty happy with my efforts, but my back is aching from all the bending over of doing my first 2 courses and cutting.

Picture 1 shows my new arch template and my first tapered arch bricks.
The mortar joints are about 20mm at the back of some of the row bricks 15mm on others. I am using only the heat resistant glue (cement based) which has a 1000 deg C tolerance, so my thinking is that the temps we will use will not be a big detriment to my larger joints as it stipulates 8mm max joints.

Picture 2 shows the pencil marks ready for cutting.

Picture 3 Is the IT telling me the line to cut.

Picture 4 Shows where my IT reaches the bottom of the arch. Is this right?

I now need to understand about the board some of you have placed flush with the arch to the centre of your domes.

I understand I need to cut / taper my arch bricks using this guide board but not yet cut the angle. Which angle?. sorry for being such a thicky but I keep reading and looking at pictures but the pennys not dropped on this part yet.
Attached Thumbnails
82cm Corner Underway in Bulgaria-inner-arch-007.jpg   82cm Corner Underway in Bulgaria-inner-arch-004.jpg   82cm Corner Underway in Bulgaria-inner-arch-006.jpg   82cm Corner Underway in Bulgaria-inner-arch-005.jpg  
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  #75  
Old 09-01-2013, 01:33 AM
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Default Re: 82cm Corner Underway in Bulgaria

Tex, The picture in thread 38 & 41 you reffered to. Does that currve go all the way to the top inside of your dome.
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  #76  
Old 09-01-2013, 06:32 AM
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Default Re: 82cm Corner Underway in Bulgaria

Yorkie,

You are on the right track. Here are some pics to help you. You should do the top dead center brick of the arch then work you way down. Proabably should cut and fit complete arch before going to much farther with your dome courses.
Attached Thumbnails
82cm Corner Underway in Bulgaria-inner-20arch-20005.jpg   82cm Corner Underway in Bulgaria-34a-inner-arch-6.18.12.jpg   82cm Corner Underway in Bulgaria-34b-inner-arch-6.18.12.jpg   82cm Corner Underway in Bulgaria-35-inner-arch-6.19.12.jpg  
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Last edited by UtahBeehiver; 09-01-2013 at 08:07 AM.
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  #77  
Old 09-01-2013, 07:34 AM
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Default Re: 82cm Corner Underway in Bulgaria

Lets try this again perhaps this time it will make more sense. This is how I did my arch/ dome intersection.

Note that the inside of the upper arch follows the contour of the inner oven.

Also note the flat spot on the inside of the oven arch at the floor. As my next redo I would cut that corner off because it catches ash and takes some attention to clean out for bread
Attached Thumbnails
82cm Corner Underway in Bulgaria-img_2050.jpg   82cm Corner Underway in Bulgaria-img_2056.jpg   82cm Corner Underway in Bulgaria-img_2061.jpg   82cm Corner Underway in Bulgaria-img_2066.jpg  
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  #78  
Old 09-01-2013, 09:01 AM
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Default Re: 82cm Corner Underway in Bulgaria

Between replies I was finishing off the course and trying to figure how to make the semi template thingy.

Many thanks Faith for your lovely pictures I see how you've fitted the courses on to the arch, your oven looks huge in the pictures is this the new one.?

Russell, You are of course right about finishing the arch maybe when I have all the arch bricks all cut I will see the angle I need to make without use of this half template.

As you see from the 2nd picture I tried to make the template but its higher than my arch as I did not take into account the board and height of IT castor and couldn't work out how to correct it.

However your great outline on picture 1 gives me a better idea.
Looking at this picture my IT doesn't quite reach the arch SO, would I be right in thinking that the angle you drew would be slightly further out from the arch to meet the IT?

With regards to joint lines, whilst it is recommended to avoid them, Looking at picture 3 it seems that the arch so far has a continuous line. Looking at other pictures it seems the case, that mine is no different to others. Maybe the line will start to move now the arch is getting higher?

I can see by picture 4 that the courses attaching to the arch would be cut at a slight angle inwards for a better close fit. Am I on the right track here?

I am now at a standstill with the oven as I am awaiting new diamond discs and next week we are back in the Uk for a couple of weeks.
Perhaps my sore back will get chance to mend
Attached Thumbnails
82cm Corner Underway in Bulgaria-inner-2520arch-2520005.jpg   82cm Corner Underway in Bulgaria-inner-arch-012.jpg   82cm Corner Underway in Bulgaria-inner-arch-009.jpg   82cm Corner Underway in Bulgaria-inner-arch-010.jpg  
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  #79  
Old 09-19-2013, 10:15 AM
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Default Re: 82cm Corner Underway in Bulgaria

Ok, back from wet and cold UK and back to the oven.

Have done the 3rd row today, but ran into a couple of problems, I took several bricks off the course to make it easier to work but found I was then putting too much mortar on the side of brick and by the time I realised you can see in the pictures the inverted Vs also I have 2 joints in line, hope it doesn't effect the structure too much. (Photo 3)

I am still struggling with the arch angles for the transition, sorry guys, I know you have given me pointers and I have read and read about the string or IT to measure but its still not clicking.
as you can see I have cut the bricks in readiness for closing the arch but still unsure how to work out the angle to receive the following rows.(photos 1&2)

I cut another arch brick for the next row using the string method and quadruple checked it again and again but it is still short of the IT and I can't figure out why. (Photo 4)

I am thinking of putting in the fourth row and see if it clicks or I shall wing it when it comes to closing the arch, however if the It does not meet my arch top that would possibly mean that the transition bricks will overhang slightly over the inside of the arch bricks.
Would this be a great problem to the stability/building of the oven.

Once again my apologies to those who have tried to show me the way.....

Paul
Attached Thumbnails
82cm Corner Underway in Bulgaria-row-3-003.jpg   82cm Corner Underway in Bulgaria-row-3-004.jpg   82cm Corner Underway in Bulgaria-row-3-011.jpg   82cm Corner Underway in Bulgaria-row-3-007.jpg  
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  #80  
Old 09-19-2013, 10:33 AM
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Default Re: 82cm Corner Underway in Bulgaria

Take a look at the edited photos.

First photo has 2 curved lines, they represent the cuts for the top of the bricks on the arch.

The bricks you have mortared in for the arch appear to be correct. The uncut bricks need the surface to be a vector from the center of the oven floor out to the outside of the dome.

Your IT will show this vector or a simple string will also show it.

Because I am doing this on an ipad I can only do one photo per post so the second photo will be described on the next post.
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