Thanks - the screen shot from the Exel file really helped. Your Excel skills are fine but you are mixing units. Either convert your brick dimensions to centimeters or your other dimensions to imperial. See below, the first row is metric (with metric brick dimensions) and the second row is imperial. 17 bricks is too many for a small arch (you will actually get a negative joint thickness) so I did one for your dimensions with 15 bricks. It gives a pretty tight joint (.18 in). If you want to make the joint larger you can cut into the thick part of the bricks a little (the number input into column O). You could also go to 14 bricks - it does not look as good to me without a brick at top dead center but the inner arch is not really seen and you could do an uneven amount on the outer arch. I would also consider asking DavidS what dimensions he recommends for door opening as I believe he is not only an expert on cast ovens but also on smaller(ish) oven sizing.
Opening | Opening | Ratio | Ratio | Inner | Brick | Radius | Circumference | Circumference | |||||
Height | Width | Height | Height | Width | Radius | height | outer | Inner | outer | # of bricks | t joint | Brick W1 | Brick W2 |
40 | 42.5 | 26 | 65.00% | 21.25 | 11.43 | 32.68 | 66.76 | 102.67 | 15 | 0.46 | 6.35 | 3.96 | |
15.74803 | 16.73228 | 10.23622 | 65.00% | 8.3661 | 4.5 | 12.87 | 26.28 | 40.42 | 15 | 0.18 | 2.50 | 1.56 |
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