DYI cutting machine ready to eat some dust
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DANTE  36" (92cm) Pompei oven  Luxembourg / Italy
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Yesterday afternoon I started laying the floor and the first course.
Many emotions in that moment, I hated but I loved it !
I used an Italian refractory mortar and follow the ratio written on the bags, small batch of 1 kg each is perfect for laying around 45 bricks ( put bricks in water 1 hour before) .
I finished around 9pm and this morning at 10 was already there, completing the 2nd course .
Now I’m approaching the entry arch
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Originally posted by Kvanbael View PostCool! It has begun.
You might want to fixate your IT with more than tape and weights. But you are probably waiting for your first course to be fully set before doing so.
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Hello Guys, having some confidence problems approaching the 5th course and the arch.
I honestly don’t understand how to calculate the right angle to Bevel a bricks and all the step in order to avoid inverted V.
I’m on holiday and I’d like to prepare a list of the cutting course by course , In order not to improvising too much.
Second issue is about the arch, I understand how to lay the bricks but no idea on how to cut them on the long side (8”).
Any help would be really appreciated
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you could use an online calculator, like this one: https://www.blocklayer.com/masonryarch.aspx
But it's not so hard to do it yourself:
You first need to know how many bricks you will need, you want as few as possible, but you also want to keep the joints nice and thin.
You should realise that the dimensions at the top of the bricks are proportional to the ones at the bottom (see attached illustration)
R1/R2 = L1/L2
So, in practice:
1. You know your arch radius (R1). To know the radius of the top of the arch R2, just add your brick height. Use a flexible measure on your entry shape to determine the length of the arch (L1). Now, the length of the top arch can be calculated using that ratio:
L2 = L1 * R2 / R1.
2. Now that you know L2 (in my case it was 755mm), you can determine how many bricks you will need: My bricks were 55mm wide, and I wanted the joints to be around 5mm. Together that's 60mm. Dividing L2 by that number and rounding up to the nearest integer number (or to the nearest odd integer number if you insist on a central keystone). In my case, the result of the division was 12.58, so I decided for 13 arch stones.
N = L2 / (brick_width + joint) rounded to nearest (odd) integer
3. Now that you know how many bricks there will be, you can divide the arch lengths to find the individual brick widths:
W2 = (L2 / N)  joint
W1 = (L1 / N)  joint
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Hi Guys, I ask your opinion on one of the most difficult part of this journey: the arch.
I already tapered all the bricks and read a lot of theory, but now I’m a little bit stuck .
In order to be aligned with the dome courses, should I:
1) cut the arch bricks in order to be aligned with the 4th course (red line) , but leaving smaller bricks for the arch
2) be aligned with the 5th course, a bit prominent inside the dome but less work and bigger bricks ?
thanks for your opinion
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Thank you UtahBeehiver . I made the form 22cm deep in order to sustain a full length brick and for the moment is aligned to where the door will close the dome.
if i try to translate the picture you sent on mine i think it's more the second solution, the "green bricks".
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Hi Guys,
Most of my pictures lately are taken at night because that’s the only time I can lay bricks, from 8 to 10 pm.
Yep I know this is not the best time and with the dark I miss some details but otherwise I cannot make any progress during the week.
Now I’m at row #9, i can still lay bricks without any other support, just mortar, but I think I’ll put inside the oven a dome of sand soon.
When did you start , in your experience, to put a row only with 1/3 bricks ?
Thanks and keep mortaring
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