The fasteners (nails or screws), used in pairs, are driven in on opposing angles. *Toenailing or skew-nailing is a popular technique that carpenters use regularly to fix two timbers together by slanted application. The ends of the truss can go beyond the end arches or they can stop at each arch, that depends on your preferences. Now you can place your center truss into the slots at the apex of either arch and screw it into place. With your two end arches clamped, use screws to toenail* them to your wall frames. You can see how the end arch is clamped in the picture and the others are upside down, waiting to be put into place. Each end of each arch should sit on your walls at a right angle to them. Start by clamping the two end arches to your structure. How you choose to install them is ultimately up to you but I will suggest the following way. Well done! Since you have them, you should install them somewhere. Repeat steps 1-5 with your new A, B and C points being 10cm closer to the center than the previous ones.By keeping the string taught, you can draw a line on the board to mark your arch and the string will self adjust to keep the appropriate distance from the center point. Now with the string secured to points 1 and 2, you should be able to slide your pencil along the inside of the rope between points A, B and C in order to draw your desired arch.Use a tack, screw, nail or tape to secure the string to points one and two.Mark the two points that the ends of your string touches. Now find the center of your string and while holding its center-point to point C, stretch each end of the string so that it touches the line connecting A and B while being as taught as possible.Find the center-point of your first measurement on the plywood and draw a line at a 90-degree angle from that center point until you reach the desired height of your arch (represented by point C in the images).Measure out the span of your arch on a sheet of your plywood and cut a piece of string to the same length (represented in the images as the line which connects A to B). The images for this step should clearly illustrate the process but I will also describe them: You will need a string, a pencil and a couple of nails or screws or tacks.possibly tape. Don't worry, drawing the arch will not require you to do any math.
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