The final part to fit in the bottom quarter of the pattern is the locking piece. This holds all the pieces firmly in place.
The end securing the pieces is cut with a jaguchi joint, which is simply a v-shaped joint cut into the end (top left). I covered how I cut this joint in a post about 10 months ago.
The top right photo shows how this locking piece fits.
Once it’s in, these pieces ain’t movin’ (bottom left). You can see how the 90° v-shaped opening captures the 90° angle formed by the two short right-angle pieces.
This is repeated on the other side of the pattern, but a mirror image. Care is needed, because it’s easy to slip up with the mirror image here (DAMHIK 😰).
That’s the bottom half done.
Each quarter in the top half consists simply of two angled pieces secured by a vertical locking piece (bottom right).
Care is needed with these locking pieces as a half-lap joint has to cut on both the top and bottom edges. And the ends have to be trimmed to the exact length to form a gap-free join with the horizontal kumiko at the top and a secure joint with the two angled pieces on the bottom.
#桐 #paulownia #kiri #kumiko #jaguchijoint