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does anyone out there have a formula for calculating the dimensions of voussiors for a semi circular arch. Thanks
 

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No, I do not have a formula. What I do is lay out a pattern full scale on a sheet of plywood. The picture and method is shown in Richard Kreh's book Advanced Masonry. Hope this helps you.
 

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I always do what fjn said and draw the arch full size on a board. You will need a beam compass,a long straight edge and a pair of spring loaded dividers.
When you have cut them all you can set them out on the board and check they all fit in.
 

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I always do what fjn said and draw the arch full size on a board. You will need a beam compass,a long straight edge and a pair of spring loaded dividers.
When you have cut them all you can set them out on the board and check they all fit in.



A huge + of doing it the way Stuart & I mention is as follows. The saw man can start cutting the brick long before they are needed. If you wait until all masons hit the window or door heads you have everyone sending cuts to the saw man at once,he cannot keep up and production almost comes to a complete stop. That is very expensive,having a bunch of guys standing up waiting for cuts.
 

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I lay it out on the ground as well, use string to mark the stones/bricks and make templates. For segmental, and semicirular arches you only need to make one template besides the keystone. Gothic as well i think but can't remember

If there is enough wall below you it is nice to put a string where the radius begins to check that your voussoirs are in the correct placement
 

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A huge + of doing it the way Stuart & I mention is as follows. The saw man can start cutting the brick long before they are needed. If you wait until all masons hit the window or door heads you have everyone sending cuts to the saw man at once,he cannot keep up and production almost comes to a complete stop. That is very expensive,having a bunch of guys standing up waiting for cuts.
yeah, what he said.
 
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