Neat Box Joint Jig (no, not the I-BOX)

[Alan in Little Washington]

The latest issue of ShopNotes (Vol 21, Issue 124) has a neat little DIY box joint jig if you want to make box joints with different size fingers. It works on the same principle as used by the Leigh and PC DT jigs with variable spaced (sized) guide finger template. It has some limitations- It can only be used on a router table, it can't make fingers smaller than 1/2" (a redesign might allow smaller fingers), and there is no easy way to fine tune the fit of the joint. The examples they show are of symmetrical joints, but I see no reason it can't be used to make fingers that increase in size from the top to the bottom of the joint if that is what you want. Just the same, it is clever and appears easy to build.