Box joints on the pantorouter
My primary motivation for making this box joint template was to check the accuracy of my new pantorouter XL after tweaking it for accuracy. I figured such a wide joint would best expose distortion that the mechanism might introduce.
I needed some template that would guide the follower in vertical strokes. Previously, I made a template with slots wide enough for the follower bearing to slide in, But with the new followers that I could put in backwards, I only needed 1/4" wide slots for the pin itself. So I stacked two saw blades with a spacer in between and cut a series of slots across a hardwood board.
I taped an aluminium ruler to the work piece, and lined up even inch marks with the slot in the sled to position the board for each cut. That made for a slot every two inches. It's possible to align a line to an edge to about a tenth of a millimeter by eye. With the 2:1 reduction of the pantograph, the template gives me a cut every inch on the work piece. With a 1/2" cutter, that makes for 1/2" box joints.
The template mounts to the template holder with some carriage bolts.
I cut recesses for the bolt heads so they wouldn't interfere wit the
pantograph mechanism. Plastic knobs on the back fasten down
the carriage bolts.
Chips are just flying upwards. I later started cutting these from the bottom moving up instead, so that the chips were thrown down instead of up.
It's a good fit, though my screw advance box joint jig can do better.
So I think my adjustments were a success.
box joint jig
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