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Miter joints are some of the weakest in woodworking because of poor end-grain to end-grain gluing. That’s why I always reinforce my miter joints with a spline. I used to cut the spline slots with a jig on my tablesaw, but that gets awkward with a large frame. Recently, I began using my biscuit joiner to simplify this process. By adding an aluminum plate to the jointer’s fence, as shown, the slot is automatically centered on the joint. I cut the added plate to shape using a metal-cutting blade...
DIY Tutorial: How to Make a Wooden Chopping Board and Serving Tray. This is a great weekend project that you can start and finish in one day!