Heptagon Jig

There's a wedding that I am helping out with and when the bride saw this heptagon archway my big mouth went "I could build that." So here I am. 

To build the archway, you don't even need these jigs, but accurately marking out 51.43 deg with a speed square is for a time before 3D printers and buying the right tool for the job is for people who didn't spend all their money on 3D printers.

I used (8) 3" x 1" x 8' sticks of pine lumber along with (1) 2" x 4" x 8' stick of pine lumber from my local store. I also used 3/4" wood screws to screw it all together, and I stained the wood for a better finish.

Pick one of the jigs. You will only need one. Mark each board using the angle jig. (in the photo, the two red dimensions are the same). The wood was dado'd at the end to half the boards thickness at a depth that was equal to the width of the board. 

The board was flipped over and another dado was cut flipped around. The 2"x4" was cut down to 36"L and halfway through, a slot was cut to create feet to hold it up.

make (7) of these boards. Depending on how large you want it, you can make the lengths longer or shorter.  In my project, all my lengths started at 48" and the resulting heptagon was just under 8' rad.

Each board gets slotted in with its next one and if you have cut them all correctly, they make a Heptagon!