Essential Box Joint Jig

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The box (or finger) joint is a remarkably strong, interlocking corner joint that can be quickly made on the table saw. The only catch is that you need a jig to help you hold and position your workpieces as you make the cuts. At its simplest, a box joint jig is an auxiliary fence with an indexing key that you attach to your miter gauge. My version adds the stability of a sled and a sliding fence to make adjusting the fit easier. For additional corner-making options, you can remove the key to create offset box joints, as I did for the treasure box on page 26. The replaceable fence enables you to use this jig to match any cutter width, from 1/8" (the kerf thickness of a standard blade) up to 13/16" (the widest dado setup). But I pair the jig with a specialty box joint cutter set that cuts 1/4" and 3/8" fingers, which I find suits most situations. And it eliminates the guesswork. 

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