Modelling and assembling a Kabuto Ari joint

00:00 Introduction
00:55 Modelling the male part
06:32 Modelling the female part
09:57 Assembling the joint
11:47 Animating the assembly

The Kabuto Ari joint is traditional a Japanese wall framing joint used to join joists and wall frames. The joint is part mortice and tenon, and part dovetail, giving it a great deal of strength.

The male part of the joint has a dovetail that runs most of the way along the end of the joist, but stops at a lip which sits upon the wall frame. The female part of the joint has a dovetail socket, and a mortice to support the joist as it it lowered onto the frame. This gives it shear and lateral strength that other joints don't have.

My interest in the joint is deciding whether it could be used as a feature within fine furniture. The joint needs to be scaled down, obviously, but it seems that it could be used to join table tops to leg frames. A hall table or small side table appear to be the most likely candidate, but it may also be possible to use the joint in other applications as well.

This video shows how to model and assemble the joint in FreeCAD.