3 Plenty-strong plywood joints
2. Shouldered dado
This joint matches a narrow dado with a tongue, created by cutting a rabbet on the insert workpiece. And when you use this joint at a corner -- where it shines best -- it becomes a lock-rabbet, providing more glue surface, greater strength, and superior rigidity to a standard rabbet joint.
Cutting a shouldered dado requires machining both mating pieces. First, cut the dado with your tablesaw's dado blade or a router with a straight or downcut spiral bit, as shown right. Next, cut the rabbet on the mating piece (center photo) so the tongue fits precisely in the dado. (Make cuts in test scrap to fine-tune the fit.)
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