The box joint jig lets you adjust the jig in very fine increments. The system is designed to adjust both the size and spacing of the pins and slots that make up a box joint. Turning the fine tuning knobs, installed on the left side as you look at the jig, it can be set to cut slots that range in size from a width of about 1/4″ to almost an inch. All the spacing is as custom as you want.
There are knobs in the back that allow you to lock all these fine tuned spacings down so they don’t move around when you make your cuts.
I built it with wood I had in the shop – oak for the fence and maple for the rest. I bought the hardware but if I make this jig again (like for friends, I probably could scrounge from what I have in my jars). I have never built a jig like this so I made a few mistakes and had to rework some of the wood parts, and made several practices on threading for the inserts.
Two problems: I cut the rabbet in the platform from two pieces of wood since I was using wood I had. Since I miscut one of the first pieces I had to go back later and rabbet a new piece and therefore the router depth had to be reset. This created the problem of having them not perfectly flat to each other. So I will either have to shim one side with paper and then find a way to adhere it, or redo that whole platform. Probably the later.
If you build this, the plans are not free. They are $5 which I think is worth it. There are a lot of free plans out there for other jigs, but in my research this seemed like an easier jig to make and people overall seemed to say good things about the jig.
