My grandfather taught me this joint, I use it from time to time and thought I might share it here after cutting one today. I’ve never seen it in a book for whatever reason, but it has some advantages for the hand tool woodworker that I think make it very useful.
Its application is for square frames where two sides are hidden and one or both of the others are on show, such as drawer blades/separators fitted into housings. Typically the joint is a stubby tenon fitted into either a groove or a mortise, but I believe this joint is faster, stronger and more accurate. Faster because the full mortise depth is cut with the saw and the waste is easily removed. Stronger because there is plenty of glue area. More accurate because it never relies on judging whether your chisel is perpendicular; the full depth is guided by gauged lines, and the longer tenon means less likelihood of clamping one member out of plane with the other.
I wonder if anyone else uses or has come across this joint? I think perhaps you don’t see it in books because it has become more or less obsolete now mortises can be so quickly machined, and modern books might tend to present hand tool methods as alternative ways of doing things machines do.
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