For maximum strength, try the double mortise-and-tenon joint
Tenons times two
Set the tablesaw blade height to match the depth of the tenon cheek. Measure from the far face of the blade and position the rip fence to match the length of the tenon as shown in top photo. Make shoulder cuts on all four faces of the workpieces and test piece.
Build the saddle jig shown at left. Set the jig over the rip fence and position the fence to cut the wide cheek on the outside face of the test workpiece [Photo C]. Cut the two wide cheeks, flipping the test piece face-for-face between cuts, and check the fit of the tenon into the wide test mortise cut earlier [Photo D]. Make any adjustments needed to the fence position or blade height. When you achieve a satisfactory fit, cut the wide cheeks on the project parts.
Reset the rip fence and follow the same procedure to cut the narrow cheeks on the test tenon. Then cut them on the workpieces.
Transfer the locations of the inside cheeks from a mortised workpiece onto the test tenon [Photo E]. Set the rip fence to cut between these marks, and make cuts with each face against the saddle jig [Photo F], leaving the tenons a little too thick. Test the fit in a double mortise. Adjust the rip fence as needed to achieve a snug fit; then cut the inside cheeks on the project parts. Use a chisel to clean up the small ridge left between the tenons [Photo G].
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