Board-Stretching Joint | Popular Woodworking Magazine
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Table extension joint
I bought a planer / moulder so that I can make my own moldings. My stay required one 28‘.-long molding, but all I had to do was 12‘. boards. I didn’t want to settle for 12 separated‘. chamfered molding sections during installation. I wanted this molding to be a continuous piece. Joining the boards with diagonal scarf joints before printing them was the solution.
To make a seam with the scarf, arrange the corners using at least a 4 to 1-4 ratio“ of travel for every 1“ increase. Increasing the ratio strengthens the glue joint. The joint will be inconspicuous if you match the direction of the grain and the pattern of the boards. Use your handsaw or a circular saw to cut corners. Then join the edges by attaching a fence and routing with a flush tip.
Glue the boards together on a flat surface. Install the clamps perpendicular to the joint to prevent the pieces from slipping. You may need to carve the edges of the boards to keep the clamps at the correct angle. –Dave Olson
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