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Joinery Basics

Step 6Mortise and Tenon

Mortise and Tenon
The mortise-and-tenon joint is the best way to join end grain to long grain. The tenon is the male portion of the joint that is cut on the end of one board. It's designed to fit into an identically sized slot, the mortise, in the mating board.

Beginners often avoid this joint because the skills required seem out of reach. But if you take care in layout and cutting, you can easily achieve good results. Of course, it's always a good idea to practice on some scrap wood first. The tools you'll need are a combination square, marking gauge, drill, doweling jig, backsaw and sharp chisel.

To lay out the joint, begin by marking the tenon shoulder line. This represents the length of the finished tenon, which is usually 1 in. to 1 1/2 in. long. Use a square and pencil to extend this shoulder mark to both sides and edges of the board.
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Author:Popular Mechanics
The official instructable for Popular Mechanics magazine, reporting on the DIY world since 1902.