Straight Edges without a Jointer
Here’s a device for jointing boards using only a router. It’s a long straightedge equipped with clamps for holding a workpiece plus a durable metal edge for guiding a flush-trim bit. When not in use, it easily stores against a wall.
To make the straightedge, you’ll need an 8-ft.-long, 12-in.-wide piece of plywood, such as melamine shelving, an 8-ft.-long piece of 1-in. by 1-in. aluminum angle, 8 ft. of T-track, and some commercial clamps made for T-track or their shop-made equivalents (see Source, below).
Rout the plywood so the T-track and aluminum angle are flush with its surface. Epoxy the T-track into its groove; drill and countersink holes in the angle so you can screw it to the plywood.
To use the jig, clamp your board so its uneven edge just overhangs the straightedge, install a bottom-bearing flush-trim bit in your machine, and rout away.