Add muscle to miters with these three reinforcement strategies to strengthen casework, frames, and boxes.
Miters are among the most common joints in woodworking because they provide an attractive way to join two pieces at almost any angle. The only problem is that a basic miter is nothing more than a butt joint. It's an inherently weak joint because you're gluing end grain to end grain. Adding a spline—a wooden strip fit into matching slots cut in both faces of the mitered parts—
turns a weak joint into one you can trust.