Byrnes Tenon Jig

I made a simple tenon jig from a 3 ¼” long piece of 3” x 3” x 1/8” thick aluminum angle. I milled two 1/8” wide slots in one leg. The space between the slots was determined by the spacing between the holes in a Byrnes miter bar. The slots are 1” long and start ¾” from the edge of the leg. I bolted the jig to a Byrnes miter bar, which slides in the right hand miter bar slot on the saw.

The space between the jig and the saw can be adjusted by sliding the jig then tightening the screws. I use a piece of wood to provide the right spacing and to ensure the jig is parallel to the saw blade.

To use, I clamp a backer block onto the jig with a small C-clamp to keep the work piece from sliding around and then clamp the work piece between the backer block and the saw blade. The jig can then be slid along the miter slot to make the cut.