Router Basics


Photo 1: Clamp the straightedge

Assemble a “T-square” jig with a 1×2 and a 1×6. Clamp it to your work piece.

Photo 2: Rout the dado

Cut the dado using the 1×6 as a guide.

Dadoes (or grooves) are the cleanest, strongest way to invisibly support shelves on the sides of cabinets or bookcases. Once you try this jig, dadoes will become standard in your shelf-building repertoire. The easy way to make them is with a router and a straight bit plus a simple homemade jig. The jig is nothing more than a T-square made from a straight 2-ft. length of 1×2 screwed to a straight length of 1×6 (Photo 1). Make the 1×6 a few inches longer than the wood you’re routing plus an extra 1-1/2 in. for joining the 1×2. Screw the jig together with 1-1/2 in. wood screws, using a carpenter’s square to keep the jig perfectly square during assembly.

Buy a bit that matches the desired dado width so you can make the cut in one pass. Clamp the jig (front and back) on a test piece of wood, then set the straight bit 1/4 in. deep and make a pass through the right side of the “T” part of the jig and into the wood. Check the new dado with a square to make sure the jig is square and you’re ready for the real thing. Plan and mark the dado locations on the workpiece, then line up the jig’s groove with your layout marks, clamp the jig to the wood and dado away (Photo 2).

Cut only on the right side of the jig and push the router away from you; the turning direction of the router bit will pull the router base against the jig. If you rout on the left side of the jig, the router will tend to wander away from the jig and you’ll wind up with a run-amuck dado.

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