Box/Finger Joint Jig

Make 24, Week 14

My first try at a box I did 45-degree miter joints for the edges. For the next box, I want to try using box joints. I made this sled and jig to make these on the table saw. I also picked up a dado blade to cut these joints.

I made a little sled with two miter rails. The plan is to have different fences attached to the sled fence for different dado widths. I then made a small key to fit the dado slot as a placeholder. The first time I did this, I made the key too tall. Being that tall I had to cut deeper dados than I needed, so I redid the fence and key with a shallow dado.

This worked out pretty well on my test pieces. The set fence was held in place with a clamp, but I needed to reposition the clamp when I started the other board. I think it shifted a 1/8 of an inch or so. I’ve seen some similar jigs held together with a bolt rather than clamps. I’ll have to play around with it, but it’s close enough.

Mini sled
3/8″ dado fence with key
Spacer key
Fitting the cuts
Matching it up
Fitting joints together

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