Finger or Box Joint Parametric Jig Parts
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Three pieces to be printed together to make building a box joint table saw jig easy.
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Make your cross-cut sled. Set up your dado blade, and cut a slot in the cross-cut sled. I cut only once, because there is some wobble on my table saw. Measure the width of the slot carefully, then use the FreeCAD parametric file to put your slot width in (spreadsheet). The parts will notionally all resize, though if you you change a lot from my value of about 6.2 mm you may have to adjust some things.
Apply a thin strip of epoxy to the center plateau of the pin. Place the pin with the jig, keeping the protruding portion in the slot. Hold the pin against the push plate. Weight or clamp in place, until the epoxy cures.
The first cut on one side of each joint has the board held directly next to the pin. The first cut on the other side uses the slip-over first-cut spacer. The two, if you measured carefully, should work.
You don't strictly need it, but more detail is available in a blog post at https://www.inkofpark.com/?p=1349