Like many home-shop woodworkers, I take advantage of a router jig to chop mortises and a dado set to kind tenons. This creates the basic “sq. peg right into a spherical gap” downside, leaving me both to sq. the corners of the mortise or around the corners of the tenon, each of which require time-consuming handwork.
This straightforward jig works with the identical table-saw setup I take advantage of to kind the tenons, rapidly chamfering their corners so they’ll match into rounded mortises. Whereas this strategy sacrifices a tiny little bit of glue floor, it’s removed from sufficient to compromise joint power. The jig is a forty five° channel in a straight, flat board, which kinds a cradle for the tenoned workpieces. The channel is made with two easy ripcuts, with the blade set at 45°.
To make use of the jig, depart your tenoning setup in place so the rip fence gives the identical size of minimize. This ensures that the dado set will merely brush the tenon shoulders, leaving clear corners there. You’ll want to regulate the peak of the dado blades for the chamfer cuts, however that step is quick and simple, even when the tenons are off-center.
—BILL JANZEN, Chapel Hill, N.C.
Drawings: Dan Thornton
From High-quality Woodworking #310.
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