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Post by turkey on May 29, 2012 21:19:50 GMT
the arch looks nice but I would have angled side parts for it to rest on rather than vertical edge bricks.
I would want 2 more bricks following the arch angle.
imagine the horizontal brick with its corner nipped off and another horizontal brick on top who about a 45 degree angle cut, this would allow the extra arch bricks to follow the form out over the supporting walls. Will try to get a pic to explain.
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Post by pete123 on May 30, 2012 15:18:05 GMT
I think I may have done that but the picture may not show it very well. I'll post another photo later. I've Only popped in for 2 minutes to miss the rain.
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Post by pete123 on May 30, 2012 15:19:56 GMT
...I see what you mean. I did take another picture but didn't post it. The square bricks were propping up the others just to see what it looked like.
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Post by cannyfradock on May 30, 2012 18:53:02 GMT
Pete
Your arch looks good and will not fail. But to add something.....you have your arch former and a piece of hardboard? on top of the former. The topside of the hardboard should be level with edge of the vertical bricks on either side. (yours look slightly below....no problem, the arch will still work)....this is the spring or springing point of your arch.....sometimes the Keystone at the top of the arch has to be cut, but more often in our case.....of a shallow arch the bricks can be spaced so no cutting is needed.
Thanks for sharing your build with us Pete.......it's interesting to follow.
Terry
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Post by pete123 on May 30, 2012 20:28:27 GMT
Thanks chaps I think the following photo's will help. The thermocouples arrived today (good timing). I got two and I am going to plonk one here. Attachments:
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Post by pete123 on May 30, 2012 20:38:06 GMT
I've called this one "tricky brick" for obvious reasons. I planned and made the arch before offering it up to the bricks so it came halfway up the brick!. Ideally I should have put it in line with the top of the third brick but because I had already created the arch I had to cut out a section of the brick. I could have moved it up but then the arch would be too high or I could have made a new former with a shallower angle. Attachments:
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Post by pete123 on May 30, 2012 20:43:52 GMT
Back of tricky brick. I've also cut a bit off the indispensable piece of wood which was becoming annoying and getting in the way.
To take account of the fact that the pivot is an inch high and it's on a piece of chipboard I will have to bring the rings in by about 7mm each row? Otherwise the oven will be 19 1/2" high rather than 18".
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Post by pete123 on May 30, 2012 20:45:30 GMT
Photo for above entry. Attachments:
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Post by pete123 on May 30, 2012 20:46:21 GMT
Arch Former. Attachments:
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Post by pete123 on May 30, 2012 20:48:49 GMT
The Front of the arch with the bricks dropped into the cut-outs. Attachments:
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Post by pete123 on May 30, 2012 20:53:34 GMT
The rear of the Arch. Somehow I need to mark the angles to cut the back of the bricks. If the wood doesn't do the trick I'll try a bit of string. Attachments:
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Post by cannyfradock on Jun 1, 2012 19:58:03 GMT
Pete
I haven't used a jig so this is just a suggestion. Could you not cut the length of you jig to fit Inside the radius of the internal arch.......just to mark the back of the arch bricks. You could then re-attach ....and overlap another piece of timber on to the jig to give you the same diameter as you had before.
I used a fixed form (although it could be removed for pointing at stages)...but I built the internal arch at the same stage as the dome rings went up......that gave me a better idea of how to cut the rear of the arched bricks......
Terry
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Post by pete123 on Jun 1, 2012 20:25:07 GMT
Thank, I might play about with the jig / trammel thing & improve it. Currently I'm just aligning them up with a pencil mark on it.
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Post by pete123 on Jun 1, 2012 21:48:01 GMT
I've cut the bricks for the arch to shape now. As an afterthought I put them next to each other and they line up nicely. Only one needed a slight trim. Attachments:
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Post by pete123 on Jun 1, 2012 22:05:11 GMT
Don't try this at home! When it's at room temperature the display reads 170? I thought it may have missed off a decimal point meaning 17 degrees? So I put it in my recently, made tea and it went up to 238? rather than 100? I even considered if it was reading degrees Kelvin? but Wikipedia says that is -270 degrees. I've got 2 probes and 2 readouts and have tried swapping wires around & various combinations. Does anyone have any ideas? Attachments:
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