petec
WFO Team Player
Posts: 232
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Post by petec on Sept 16, 2012 10:25:05 GMT
Thanks all, Terry - when you lay out the ring first do you use a full vertical brick so that you have a half brick height left above the hearth when its laid ? Thanks Pete couple of pics of the Thermalite layer if anyone is contemplating a similar build - Thanks for the idea Terry. I got 620x215x100mm blocks from local builders merchant Milfords in Leeds. Also spent a bit of time making an "indispensible tool" .... hope I got it right - had to make sure with the hinge fitted the perimeter was still 15.5" - as my hearth is 31" diameter. Realised that as you go higher - and the hinge closes - that actually the radius gets slightly smaller - closer to 15" at nearly vertical, but hey, I wont be using it for the last few courses anyway. No brickwork after all today - just a bit of dry laying out and contemplating ! Let me know if I've overlooked anything with the tool. Cheers Pete
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Post by bookemdanno on Sept 16, 2012 16:12:46 GMT
Hi Pete! It should work just fine. I found my itool might snag a brick as you move from one to the next, but just give the brick a little re-seat as you move away. also you'll have to make sure that your itool base board doesn't snag on any bricks as you remove it. I'm thinking that you have to spin the board to get it out of the archway? I made mine the similar way, but i cut the board into 3 and then braced it with another section of ply, screwed across the cut. Then you could simply undo the screws and the base board broke down into 3 bits. Good luck with your build!!!
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Post by cannyfradock on Sept 16, 2012 16:30:37 GMT
Pete I haven't used a "jig" on my Pompeii builds(used a form )but I admire the people who have the patience to use one and get the interior spot on. The first circle I lay is a "snapped" half brick on edge. This sits 4 1/2" high. I lay the hearth inside the first ring...."on flat" (3") so there is 1 1/2" of the first ring protruding out from the surface of the hearth. Many people use this method but it seems there is not a "BEST" way of starting off. It's just my preferred method. imageshack.us/photo/my-images/694/soven4005.jpg/ Terry
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Post by tonyb on Sept 16, 2012 16:35:59 GMT
Agree with bookemdano. Depending how you do the internal arch the dia may be less at the two ends of the arch so you may have problems with a single piece base board
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petec
WFO Team Player
Posts: 232
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Post by petec on Sept 16, 2012 19:21:54 GMT
cheers guys
my baseboard is about 14 inches wide so should come out of the 16inch opening OK i guess
Rgds Pete
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Post by tonyb on Sept 17, 2012 10:07:39 GMT
Pete, I don't think I've described what I'm getting at very well, its not about the size of the opening, its how you place the bricks for the inner arch. If you look at the pictures of the first brick course on my blog you'll see what I mean.
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Post by faz on Sept 17, 2012 10:53:14 GMT
Pete. Does the step up at the end of your tool place the centre of rod in line with the centre of your bricks (heightwise I mean)? If it doesn't you'll get a little step between each of the chains.
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petec
WFO Team Player
Posts: 232
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Post by petec on Sept 17, 2012 14:36:11 GMT
Faz, makes sense and I hadn't considered that - but can easily alter the tool - many thanks. Tony - thanks - I checked out your blog but still don't really understand why the base of the tool would be a problem to remove - clearly I am missing something ( probably a few brain cells ! ) Rgds Pete
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Post by h12rpo on Sept 17, 2012 16:24:47 GMT
I have to admit i was puzzled as well until i drew it ! Its easier to see then that because the arch bisects the diameter, then the base board which is the full diameter width wont rotate past the arch ends and will be stuck inside the dome Not sure if i've explained it any better but if you draw it you'll see
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Post by faz on Sept 17, 2012 17:06:37 GMT
I gues it depends on the exact placement of the arch bricks, whether they actually reduce the diameter at that point or not. You can always cut one end off and reattach it using tape, so you'l be able to break it off easily when you're done but it will still locate your IT in the centre of the oven.
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petec
WFO Team Player
Posts: 232
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Post by petec on Sept 17, 2012 17:36:13 GMT
got it ...thanks guys.
Yes the "chord" i think its called, that the entrance arch makes across the circle is less than the diameter of the hearth, so when rotating the ply base of the IT it will get stuck and wont be able to rotate enough to get past and out of the entrance.
Solution - I think I will cut it into 2/3rd and 1/3rd, and make it hinged so that 1/3rd of it can be lifted.
Thanks for pointing out - would have frustrating getting to that point and not being able to remove it !
Cheers Pete
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Post by tonyb on Sept 18, 2012 7:17:14 GMT
Not easy to explain but glad you've got it.
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Post by turkey on Sept 18, 2012 8:45:36 GMT
I thought about this but with a hinge it will be fine, you wont use this for the last few rings so the tool will be "stuck" in the hole at the top as you cannot lower the arm, but you rotate the base and have the arm pointing to the rear of the oven, and then as you slide the base out it will fold down into the oven and make it out.
I think that is what you gents are talking about? and how I got my tool out which is identical to this one.
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Post by h12rpo on Sept 18, 2012 9:59:40 GMT
No, turkey, we're talking about the base being stuck cos it wont rotate past the arch sides :-)
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petec
WFO Team Player
Posts: 232
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Post by petec on Sept 23, 2012 20:12:01 GMT
Hi - only small progress this weekend due to other jobs and guests. Had lots of fun cutting bricks with bolster and lump hammer , and no waste so Far !! Got first course of firebricks laid out ( as well as altering the Indispensable Tool ) so made a start on the dome. BTW, the cut bricks in the hearth are just a few dcut for the next course - not anything to do with the hearth itself !! Just one question - I just laid my first course without back-filling with gaps behind with home-brew as I didn't want to disturb the forst course in any way. I thought I would be able to back-fill between the bricks with HB later on once set nicely. But then when I tried a couple to use up the last of the batch of HB, I noticed that its quite tricky to get into the gaps. Will it matter if I have "air pockets" in there ? I started to worry a bit that at high temps the air pockets could cause pressure etc. Cheers Pete
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