Double Mortise and Tenon Improves Joint Strength
Add structural integrity to delicate furniture parts
Synopsis: This article explains how to design and execute a double mortise-and-tenon joint. First, prepare the stock with the end use in mind, and then think through the layout. Mark and cut the joinery, starting with the mortises. The author explains how two tenons are not twice the work and gives examples of designing with double-tenon joinery. He also shows how to make a simple jig for routing mortises.
The mortise-and-tenon joint and its many variations have long been a preferred method for joining two pieces of wood at a right angle or close to it. One of my favorite versions is the double mortise and tenon. I use it to increase the strength of a joint on relatively small furniture parts, such as those on the freestanding room screen I built last year. I knew the screen frame would be subject to some flexing in daily use, and I…