Kane Tsugi Joint - Three Way Pinned Corner Mitre

This is quite a strong three way corner mitre joint, which, if you follow the instructions and photo's should be within the capability of a modest woodworker with sharp tools. The video should give you an idea of whether you are up to the challenge.

Step 1: Initial Preperation

Prepare all three joining components to the same square dimensions (equal width and thickness, with all sides at 90° to each other)

Scribe a line on the two sides of each component that will be on the inside of the corner. The line should be the same distance from the end as the thickness and width

Join the outside ends of these lines, to the outside corner of each component with a knife line. A mitre square (45°) should help with this

Create knife walls on the waste side of these knife lines.

Step 2: Layout Method, and Component 1

I find it easiest to layout an 8x8 grid on the ends of each component, and transfer lines down the sides to the knife lines. Then it is easy to shade in the regions that need removal, before any sawing or chopping begins

Component 1 - Follow the shading in the last four photo's above

Step 3: Cutting Component 1

Saw on the waste side of the regions to be removed, as far as possible, without cutting past the knife lines

Where shading is removed as parts are cut off, re-establish it with marking gauge, rule, etc.

After completing all the removal possible with the saw, switch to a sharp chisel and chop or pare away the rest of the material, leaving the mitred outside corner and the two long tenons, shown in the last photo

Step 4: Cutting Component 2

Layout as per the first photo'

Chop the mortise right through, testing the fit with the corresponding tenon of component 1

Saw away as much waste as possible, and clean up to the lines with a sharp chisel

Step 5: Test Fit 1 to 2

Adjust as necessary for components 1 and 2 to fit together

This will require cutting one of component 1's tenons to just miss the tenon of component 2, as shown

Step 6: Cutting Component 3

Layout to accept components 1 & 2

Chop the mortise, to take component 2's tenon, right through, testing the fit with the corresponding tenon of component 2

Chop the mortise, to take component 1's tenon, through to connect with the previous mortise, testing the fit with the corresponding tenon of component 1

Saw away as much waste as possible, and clean up to the lines with a sharp chisel