The final fitting of the tenon in the mortise.
Once I achieve the perfect fit it is time to make the Box joint within the mortise. Note that the mortise pocket is about 1/8th in. deeper than normal as is the tenon, I believe this simple modification goes along way to help strengthen this type of joint.
With the aid of a simple jig the box joint is made. Accuracy and close tolerance work is the key to a box joint’s strength, A machinists caliper is probably the easy way to set up the jig, but trial and error would also work. I would strongly suggest making a box with box joints to understand the relationship of the pieces.
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