To join the 2 pieces at a 45 degree angle will require a 45 degree bevel on both pieces to form a 90 degree corner. That means there will need to be 2 opposing cuts, 45 degrees to the left and 45 degrees to the right and then since the back is NOT 90 degrees it will get CONFUSING!Just a quick note: If the back is not at a 90° angle to the seat, and the pew is disassembled, the 45° cut on the back will be a compound angle cut.
It can be looked at as a larger picture. Lets suppose that you have a left and right pew, but they are each assembled. If you had a humongus miter saw, as the way the pew sits on the floor, if you put it into that big azz saw, and set the miter to 45°, made a pass down, and then did the other side, they would fit just like doing crown moulding that way.Just a quick note: If the back is not at a 90° angle to the seat, and the pew is disassembled, the 45° cut on the back will be a compound angle cut.
This will test your skills. Instead of trying to make two beveled edges meet, straight cut just one, and cope fit the other one, just like an inside corner of a moulding.
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