Twin Tenon

Two vertical mortises double the grain surface

Mortise walls are end grain, limiting long grain gluing surface

details of craftsmanship when to use

Twin Tenons

Mortise walls are long grain exposing maximum gluing surface

When basic mortise and tenon joinery won't give you a strong giue joint, take a look at this tried and true variation.

A mortise and tenon joint is a traditional way to join two work-pieces at right angles. It's a strong joint with a lot of gluing surface. But depending on the orientation of the workpieces, there are times when a simple mortise and tenon joint isn't the best choice. If that's the case, using a twin tenon can create a much stronger joint.

HISTORY. The twin tenon has been employed for several centuries. It was first used in ship building, where it was necessary to keep large timbers from twisting or splitting. With side by side tenons in matching mortises, there's less likelihood of the tenoned work-piece twisting or warping. Later furniture craftsmen recognized the value of this joinery and started using it to join workpieces at right angles, such as a rail to a table leg.

STRONGER JOINT. One of the best reasons for using a twin tenon in woodworking is to add gluing sur


face to the joint, since long grain or face grain provides a better gluing surface than porous end grain. In a conventional mortise and tenon joint, like the one shown in the left drawing below, the length of the mortise runs with the grain. This allows for the maximum long grain to long grain gluing surface between the mortise and tenon.

But when I have a project that calls for the face of a rail to lay flat, I know that the long grain

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Wood Working for Amateur Craftsman

Wood Working for Amateur Craftsman

THIS book is one of the series of Handbooks on industrial subjects being published by the Popular Mechanics Company. Like Popular Mechanics Magazine, and like the other books in this series, it is written so you can understand it. The purpose of Popular Mechanics Handbooks is to supply a growing demand for high-class, up-to-date and accurate text-books, suitable for home study as well as for class use, on all mechanical subjects. The textand illustrations, in each instance, have been prepared expressly for this series by well known experts, and revised by the editor of Popular Mechanics.

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