Loosen the router collet. Insert a 1/2-inch straight router bit and tighten the collet.
Attach the router to the table. The router enters the table from underneath and twists onto the connectors.
Place four 12-by-6-by-1-inch pine boards together with the broad sides, not the 1-inch edges, touching. Make all edges even.
Clamp the boards together by placing two clamps on one 6-inch side and two clamps on one 12-inch side.
Clamp a 1/2-inch spacer fence to the router table 1/2-inch from the router bit.
Place the clamped pine boards along the spacer fence. Push the boards over the turning router bit for the first cut.
Place the newly cut 1/2-inch groove on the ridge on the spacer fence with each new cut. This makes a 1/2-inch space between each box joint cut. Finish cutting the entire 6-inch end of the boards using this spacer.
Release the clamps on the pine boards.
Attach two pieces of the pine wood to each other by connecting the box joints.