|Project by dryhter||posted 01-14-2011 10:47 PM||4412 views||8 times favorited||12 comments|
The Art of Joinery
I decided to build a small Game Table for my Sister in law as a Christmas present two years ago. The table was a relatively simple project using traditional joinery methods.
I had built several tables similar to this before and on this one I wanted to style it with a light delicate feel.
The mortise and tenon joint at the top of the leg, where the apron joins to the leg I felt was a weak point and I have seen this joint fail.
The problem boils down to the fact that there just does not seem to be enough space to create a substantial joint, especially since I was trying to keep the piece delicate looking, at best I had a small stub of a tenon. Somewhere I had seen an example where the craftsman had mitered the tenon within the mortise to increase the size of the stub.
That got me to thinking. I liked the idea of the mitering the stub to increase the size, but I did not feel that it really added any strength to the joint. This thought process led me to thinking about developing a joint within a joint. I thought about what needed to be done to improve the strength / stability of the joint. Most of the failures that I had seen were usually the mortise cracking from stresses from the leg acting as a lever on the haunch of the joint the fulcrum.
I visualized the box joint within the mortise as a way to increase the size of the tenon and give it maximum surface area to help with stresses applied to the joint. And by deepening the mortise so that it extended past the mortise that it was perpendicular to and increasing the tenon to maxim depth the joint was actually locked in at this point.
I have named this joint the Superior mortise and tenon joint and have used it several times since coming up with the idea. I no longer glue this joint, but simply use a drawbore peg, making the joint knockdown adaptable. This joint would also work very well in heavy duty applications such as a wood working bench where the repetitive actions of working wood stress the joinery of the associated joints plus the ability to disassemble the bench for moving, storage or repair.
-- Chips and Shavings/ see you at WWW.underconstructionlive.com