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Locking miter joint!

If you are a woodworker then have have built some kind of project where a miter joint needed to be re-enforced for strength. If your looking for something different then maybe a locking mitre is the answer your looking for. This joint will add tons of strength to your miter but it is pretty tricky to do. I think you would only want to do a joint like this if the top part of the miter is visible so that at least your hard work can be seen because there are easier ways to strengthen a miter if not.



To get started, install a 1/4″ dado stack set to 1/4″ high in the table saw. then set your fence precisely to the thickness of your material. The best way to do this is by using the material as a reference, instead of actually measuring it.


Next set the blade height to the thickness of your material. Again it is much better to reference your material instead of using a measuring tape.


Then set your fence to the inside of the dado  (as shown in the pictures)



Then you can go ahead and cut your dado by using an auxiliary fence on your table saw. By using an auxiliary fence this allows for much more support because you’re running your workpiece on its end. I also included a piece of scrap material behind the workpiece to prevent chip out.



after your first two dados have been cut, your work pieces should line up like in the picture above.


Set your dado stack to the height of the top of your long dado (picture above)and set your fence to “0” so you can cut a rabbit.


With an auxiliary fence, cut the 1/4″ rabbit.


As you can see in the picture above, the long tenon has to be trimmed to the length of the dado and the two mitres have to be cut on the top.


I decided to cut the mitres first because this allowed me to creep up on the length of the tenon to get a good fit. The picture above shows how to use the auxiliary fence to support the workplace as it goes through the table saw.



Here I cut the second miter by, again using the auxiliary fence to support the work piece.


As you can see from the above picture, with the mitres cut I can now creep up on my tenon length to get a perfect fit.



And as easy as that, your done! Mine didn’t turn out absolutely perfect, but not bad. I think after doing it a few time, it would probably get easier. I’m not sure if I would ever feel the need to do a joint like this but it definitely was good practise for table saw accuracy.

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