Through mortise and tenon

The classic proportion is a tenon one third of the thickness of the rail. Cut the mortise first and fit the tenon to it; a tenon is easier to pare than a mortise is to widen.
Measured sketches of traditional woodworking joints.

The classic proportion is a tenon one third of the thickness of the rail. Cut the mortise first and fit the tenon to it; a tenon is easier to pare than a mortise is to widen.