Dado joints have been used for centuries to build cabinets and bookshelves.

Add this joint to your woodworking repertoire using a shop-made jig and router.

With this setup you’ll perform precision cuts at varying widths every time.

It’s a simple joint but extremely effective.

The pieces are assembled using glue and screws.

Dado joints are only effective when the two pieces of wood stock are aligned tightly together.

Router Joinery Basics: Dado| Woodworkers Journal