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Chapter 4. Maple Mike: > The Club: Not That Thing You Clamp Onto Your Steering ... - Pg. 139

MAKE: PROJECTS Eccentric Cubicle < Nano-Project > The Oughta-Be-More-Common Bicycle Hub Cam Lock Hack I n which our ribald workshop chicanery creates many tons of quick-release clamping pressure goodness with a handful of scrap yard bicycle components 'n' shit. What we're bodging together here is commercially avail- able, sorta. There's a lot of very innovative cam-based clamp- ing solutions on the market. By all means, explore the wide variety available. Some of them are really quite useful. The ones here are free. Which is good. When you see how much the commercial products cost, it's actually X-tra Special Super D-Lux Good. Plus, this is gonna get your brain thinking about cams in all kinds of other different directions, which is also good. Time to get some stuff. Yes, you're going the scrap yard again. Unless you get lucky and find what you need in the dumpsters on the way there. I'm such a kidder. To make the best use of the bike bits that you'll be scav- enging, you really need a tap and die set, but it's not abso- lutely necessary. I will be continuously prodding you until you do buy one though. Pictured in Figure N4.01 is what we're hunting: they're used all over the place on bikes these days. Cinch 'em up reason- ably close with the thumbnut, then reach for the cam lever and get about 15 tons of pressure (really) with a flip of your finger. Absolutely bloody marvelous. Primary mechanisms . . . ya gotta love 'em. The trick is to make a custom nut for it that passes through or locks into the hold-down slot of the drill press table depending on the alignment. This approach is much easier than having to thread the thumbnut completely off the bolt shaft when installing or removing it. See how useful the tap and die set is? Custom-made nuts, cutting threads down the full length of the cam's bolt shaft. You could bodge around these jobs with mangled washers and spacer blocks, but it's just so much more graceful like this. If you invest a bit of brainwork into pondering the mecha- nism at play, all kinds of potential uses will become apparent. Set some appropriately sized T-nuts up into the underside of your workbench surface and you'll have rock-solid hold- downs available just by screwing in a cam bolt equipped clamping jaw. They make a really useful retrofit (again with the T-nuts) onto the base of your jig construction set, and you Figure N4.01: Quick release cam levers, picked fresh. Figure N4.02: The most obvious place for something like this is holding stuff tight on the table of your drill press. 128