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We’ve probably all got one item in our toolboxes or chests that we really, really don’t like, but find too handy to toss. For [Someone Should Make That], that item was the bolt-rounding adjustable wrench. Rather than continuing to gripe about it, or alter his habits to make greater use of the full wrench set he also owns, he decided to build a better mousetrap. By mousetrap, we mean adjustable wrench.
It took a couple of iterations on-screen before he hits on a solution that seems to work quite well indeed. The problem [Someone] had with his adjustable wrench was one of physical slop: once adjusted, there’s just too much play in the mechanism, which results in rounded-off bolt heads. [Someone]’s CNC’d solution takes inspiration from the CNC machine that manufactures it: he’s using spring-loading in the adjustment screw akin to what you find in the anti-backlash nut on your CNC mill or 3D printer’s ball threads. The tension from the springs keeps the wrench tight to the bolt, and that keeps [Someone] from rounding them off. Speaking of 3D printers, he prototyped in plastic before machining, and the screw in the end product stayed that way. It would be interesting to see how well that holds up.
