Originally Posted by woodbutcher360
Would these tenons be through tenons?
Yes, wedged tenons go completely through the leg. Each side of the tenon has a kerf cut into it with a bandsaw/saw to about 3/4 of its entire internal
length. A 1/8" hardwood wedge is driven into both kerfs to spread the sides of the tenon against the mortise. The tenon takes on a dovetailed shape.
Prior to this, the wood worker would have relieved the mortise about 1/8" at each outer edge (where the wedge is driven into the tenon) and tapered back to about 3/4 the length of the mortise to match the dovetail shape produced by the driven-in wedge. IOWs, the most internal 1/4 of the 4" mortise is left undisturbed. This section is not tapered in any way.
The attached photo shows a prototype (partial) tenon with its wedge. The black horizontal lines are incremented in inches. From this it can be seen that the wedge only extends into 3/4 the lenght of the mortise.
Several years back I built a mobile bench for my INCA bandsaw. Beneath the bandsaw I keep my Craftsman tool chest. This whole contraption (see photo of big blue) is very heavy, but it is extremely sturdy because it has held up for longer than I care to remember.
The point is that the base is held together with wedged-tenons. These were made with a mortiser and hand chisel. The joinery looks very sloppy to me (now), but in spite of my poor crafstmanship back then, the base has held together perfectly. And it has survived being shipped from NM to IL.
The Man must have been looking over my shoulder on that project.
Bottom line is that wedged tenons are IMHO, the toughest joinery except with the possibility of dovetails or pinned tenons.