Joinery techniques are something that everyone should really get used to trying. It is after all part of the battle of making any project. I say, why just stick with one or two joints in your arsenal of tricks.
To start with this joint you will need a table saw, flat bevel blade and tenoning jig. You can do this joint with a simple bit set for a router, but where is the fun in that???
First, cut a couple of pieces to test that are exactly the same width. Thickness can vary. Then take one piece and put it upright in the tenoning jig and secure it in the jig securely.
Second, set up the distance from the blade. In my case I used 1/4” from the blade.
Next, set up the blade height using adjacent piece that you plan on attaching to it. This will ensure that you cut the depth appropriately.
Now just make a pass through the blade, then remove the stock and turn it 180 degrees and make another pass to center your morise.
Once that is done, you need cut the 1/4” tongue for the lock joint. I used the 1/4” brass bar to set up the depth from the outside part of the blade.
Now it is time to make the groove or dado in the adjacent piece. Set the blade to 1/4” high using the same brass bar.
Take the piece that you cut the mortise/tongue and use it as a gauge to set up the depth of the groove from the edge.
After one pass, you can see the depth is just about right. You will need to finesse the fit once you have the layout figured out.
Make the second pass to make the groove 1/4” wide.
Do some final finessing of the fit, you will have a perfectly fitting joint. I love the way this joint looks and it works great, super strong and hides end grain.
You will love it!
Now get out and make it in your shop! BOOM!!!