Cutting the Joinery – Mortise and Tenon in Hinoki
For this project, I used Japanese cypress (hinoki) in large sections. The posts and beams are thick, so accuracy in layout becomes critical. Even 1–2 mm error shows immediately at this scale.
Step 1: Layout
Each mortise location was marked by hand. I reference from one consistent face and edge to avoid cumulative error. Pencil lines are kept sharp and light — just enough to see, not enough to create confusion later.
On large timbers like this, clear marking matters more than speed.
Step 2: Cutting the Mortise
The mortises were cut deep to receive full tenon shoulders.
I rough-cut the cavity, then cleaned the walls and bottom.
The goal:
- Flat bottom
- Clean vertical walls
- Sharp internal corners
No gaps. No rounding.
Step 3: Cutting the Tenon
The tenons were cut slightly proud at first. I prefer sneaking up on the final fit rather than cutting exact dimension immediately.
Test.
Trim.
Test again.
The fit should require firm pressure but no hammering during dry assembly.
