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I need help getting the proportions right on a tusk tenon for a trestle table. Each leg assembly of the table will have two upright legs. The assemblies will be joined by stretchers with tusk tenons and wedges. (There will also be tw stretchers at the top of the leg assemblies, direcly under the table top.) The legs are 2 1/8 inch square. The stretchers are 4 inches high by 5/4 inch wide. The mortise for the tusk will by 7/8 inch thick, or approximately 1/3 of the total width of the leg. Question 1: Can I make the tusk thicker than 7/8 inch thick or would this additional thickness damage the strength of the leg? If thicker, how much?
Because the tusk is 7/8 inch thick, I've designed the mortise for the wedge to be 3/8 inch wide, leaving 1/4 inch of wood on each side of the wedge mortise. Question 2: Is this enough wood on either side of the wedge mortise? If not, and I reduce the wedge to 1/4 inch, will the wedge have enough strength?