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Post by lal5000 on Sept 24, 2016 8:00:47 GMT
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Post by lal5000 on Sept 27, 2016 17:09:09 GMT
had a few fires. easily gets to 450c in an hour and not even warm to the touch on surface. no visible steam from the vermicrete and no cracks yet! built a shelf for implements and gloves etc. proven very handy. filled the store with some seasoned apple wood. had our first lahmancum. was incredible!!! have increased flue from 500mm to 1500mm as draw was poor. still not perfect but better. not fussed about stains on arch. once fire is going no smoke comes through the arch.
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Post by lal5000 on Oct 5, 2016 10:08:27 GMT
k rend hpx base coat on. going for Fintry stone finish when I can get hold of some. nightmare trying to get any colour other than white! fired up a few times and had pizza. it was great!
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Post by lal5000 on Oct 7, 2016 10:39:48 GMT
Im trying to build an oven door and have a few questions.
1. Am I ok to use sheet copper? I have a fair amount spare so would like to use it.
2. Im planning on using copper casing, then vermiculite board on the hot face and cal sil board as a back up. All encapsulated in sheet copper. Good idea? or should i lose the cal sil?
Any suggestions appreciated.
Laurence
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Post by lal5000 on Oct 7, 2016 16:01:58 GMT
made a bad mistake of completely messing up the fire silicone around the firing door. God I hate silicone! had to come up with a solution to hide the silicone so used some left over slate tiles. think it's turned out ok. still need an answer to the question above about the insulated copper door to sit between the firing door and dome
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Post by downunderdave on Oct 7, 2016 19:57:10 GMT
Im trying to build an oven door and have a few questions. 1. Am I ok to use sheet copper? I have a fair amount spare so would like to use it. 2. Im planning on using copper casing, then vermiculite board on the hot face and cal sil board as a back up. All encapsulated in sheet copper. Good idea? or should i lose the cal sil? Any suggestions appreciated. Laurence The problem with using copper is that it is highly conductive, not really what you want for a door that's meant to insulate. The up side is that it's a metal that is pretty easy to work. Stainless is way less conductive, but harder to work and weld. Look at the attached table for thermal conductivity of materials. You'll see that most metals are very conductive, copper at the top of the list. I use a wooden door faced with an insulating panel because wood is a much better insulator, is traditional, easy to work and looks great. Its main drawback is that it will burn if heated too high or too long. www.engineeringtoolbox.com/thermal-conductivity-d_429.html
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Post by albacore on Oct 7, 2016 20:00:30 GMT
I don't see why copper wouldn't work - it's got a melting point over 1000C, so heat shouldn't be an issue. Are you planning to clad the edges? I see that as the potentially tricky bit.
PS: sorry, I preferred your arch before!
Lance
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Post by lal5000 on Oct 7, 2016 20:11:03 GMT
Yes. I preferred it before I messed it up with the silicone!
It was a right old mess after that!!
Hmm.. Welding isnt an issue as I'm managing some work out of a fabrication shop at the moment. Definitely plan to clad the edges and fully encapsulate anything that's inside.
Im just trying to save money using stuff that I have lying around
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Post by albacore on Oct 8, 2016 19:45:20 GMT
Downunderdave has a point about the high thermal conductivity of copper.
Whether there would be much real world conduction between oven side and outside, I'm not sure - I guess the metal will only be 1.5mm thick or so, so not a big path for transmission between front and back. I guess it could make the front a bit "hot to handle", though.
You could consider cladding front and back with copper and the edges/sides with stainless steel. This could be brazed to the copper as required.
Just a thought: now you've got your "front door" on, is there room to pass through a baking door?
Lance
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Post by lal5000 on Oct 8, 2016 20:41:33 GMT
Downunderdave has a point about the high thermal conductivity of copper. Whether there would be much real world conduction between oven side and outside, I'm not sure - I guess the metal will only be 1.5mm thick or so, so not a big path for transmission between front and back. I guess it could make the front a bit "hot to handle", though. You could consider cladding front and back with copper and the edges/sides with stainless steel. This could be brazed to the copper as required. Just a thought: now you've got your "front door" on, is there room to pass through a baking door? Lance That's a very good point and I nearly didn't check but it fits, by a whisker! You just have to turn it at an angle to get it through the firing door. I have abandoned the copper idea and the stainless steel as I dont want to spend any more money! Settled on 25mm vermiculte board, 50mm cal sil board and then 20mm oak front. All held together with fire silicone. Seems suprisingly solid. Still would like to clad the edges/front end with something but not sure what? Its not pretty but it will perform ok i guess. Will post a pic once the cast iron handle and thermometer arrive.
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Post by lal5000 on Oct 19, 2016 12:57:47 GMT
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Post by lal5000 on Nov 29, 2018 12:17:07 GMT
2 years on and the WFO is still going strong. Few updates: 1. Changed the height of the flue as it was smoking in my face on start up. 2. All the slate tiles fell off. think the adhesive wasn't up for the job. So I chipped them away and cleaned the arch with brick acid. Much happier with it. 3. Removed the front door as it was just getting in the way and had rusted a bit. 4. Had the guys at work build me a stainless clad internal front door. Sheet of insulation. Sheet of vermiculite board (facing the fire) all clad in 4mm stainless steel. Works like a dream. Might render it a different colour this summer just to freshen it up as it sat under a cherry tree for 2 years.
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Post by oblertone on Nov 29, 2018 13:03:32 GMT
Looking good; did the cherry tree fall or was it pushed ? More importantly, what happened to the wood ?
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Post by lal5000 on Nov 29, 2018 13:15:41 GMT
It was pushed rather aggressively about 2 weeks ago. The trunk was 800mm diameter!
I've got a lot of wood to get through. All kept on site
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Post by devontiger on Nov 29, 2018 13:17:11 GMT
Yes the wood. Cherry is ok to use in the oven.
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