Wood – Tips to get (close to) accurate bevel angle by handsaw

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I'm trying to get a 20° bevel the length of the board (36"). I'm working on a scrap wood project. I've been on an "unplugged" kick lately & finding the extra physical effort of "by hand" to be cathartic & sanity saving. However, I do have access to a decent miter saw but in this case it's sitting there mocking me. And, unfortunately, the table saw is currently in a zombie-apocolypse hot-spot. So I've settled on my pencil & trusty square, handsaw, lots of sand-products, & possibly pocket plane,(if I can figure that out.😔)

Anyway any tips, suggestions, how-to's , no matter how basic & obvious,or complex for that matter, are welcome!

Best Answer

I did something similar to this in my younger years when I needed a board cut with a 45 degree angle. I marked the cut line on the edges and face of the board. Then positioned the saw to the cut line and clamped furring strips on the top and bottom of the board up against the positioned saw the length of the cut. the two furring strips acted as a double fence for the saw and the angle turned out pretty good. If your miter saw ever quite mocking you, I'd use it but I totally understand your desire to use hand tools...