You don't have to use a fence to cut box joints with this jig, so long as you modify it to fit over a template guide bushing.
As you know, the guide bushing is a metal fitting that mounts in the router baseplate. It has a low collar that surrounds the bit. If you widen the slot in the jig's base, it will drop over the collar. The jig is trapped! It can slide back and forth as far as the slot will allow. It'll pivot around the collar. But unless you lift the jig. it is in the control of that collar.
One of the biggest advantages is that it saves some setup time. Drop the jig over the template guide, set the bit height, and start cutting those box joints. No fence to set.
If thus is an appealing way to guide your box jointing jig, it's easy to modify it to accommodate the guide. When you cut the jig parts, make the base about 3 or 4 inches longer than specified by the Cutting List. Match the thickness of the plywood to the height of the guide bushing collet. Make the parts and assemble them as specified, but when routing the cutting slot, plunge-cut into the base, beginning about 2 inches in from the front edge.
when the jig has been completed and tested, widen the cutting slot in the base. Set it up, complete with fence, for routing box-joint slots, but use a bit whose diameter matches that of the outside diameter of the template guide's collar. Adjust the bit height to 'A inch—just enough to cut through the base, not into the support. Plunge-cut, widening the slot. Don't break through the front edge of the base; you need a stopped slot.
The dovetail-splice jig looks a lot like the box-jointing jig, and you make cuts in the same fashion. But the cuts only allow you to joint work-pieces end to end, as the samples show.
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