Matthias Wandel is back at it - this time building a screw advance box joint jig that makes precisely-based cuts in a stack of workpieces on the table saw. The flexibility of positioning makes it possible to cut precise joints, even without a dado blade, says Wandel, a popular YouTuber and experienced engineer and woodworker.
"The jig uses wooden gears and a threaded rod to reposition the stock. Moving to the next increment is as simple as turning the crank one or more turns," he says.
"The crank gears are interchangeable and can be meshed with a 12 and a 16-tooth gear on the threaded rod. This makes for a lot of options for how far to space the cuts apart. I made these gears as needed, but mostly, I just use it with the 48-tooth crank gear.
"But my favorite method of using the jig is to make several cuts for each slot. By using a large 48-tooth crank gear, I can mark which angles I need to set the crank to for cutting out a slot with multiple cuts. That way, I can cut slots of a specific width without having a saw blade or dado blade that cuts that exact width."
Wandel has built a homemade power feeder using a roller skate wheel, created a unique machine that sets up dominoes in uniform rows, engineered contraptions to dampen the vibration on his table saw, and designed a remote control dust control switch. He also created a curtain rod that goes around corners, as well as a slinky escalator out of wood. Check them out here.

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