I struggled to cut mitered frames with my standard tablesaw miter gauge, getting ugly gaps in the joints no matter how carefully I tried to set the miter gauge to exactly 45º. Finally it occurred to me that, if all the cuts in a mitered frame are made in the same way on the same miter gauge, any errors are incremental. An error of 0.5° on eight cuts (for a rectangular frame) adds up to a 4° gap. You could see that gap from across the room. The solution, I realized, was to cut the joinery in a way that instead caused the errors to cancel each other out. If I made a small error on one cut, it could be corrected by making an opposite error when cutting the mating face. To do this, I made a miter tool using a Shinwa combination miter square. These stainless-steel tools are very accurate, and are available at Amazon and at woodworking outlets for around $27. I attached foam pads at the top on both sides, so the tool will lie horizontally on a saw table. I also glued a hardwood strip to the square’s flanged base to distance the metal square…
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