There are three movements, controlled from 3 axles, and the gears on the axles have prime numbers of teeth (23, 43, 59). So technically the movements will only repeat every 58,351 turns of the small gear. There’s also a semi-random toggle on the head motion, so it will never really quite repeat. Almost all the parts press fit and/or lock together, so the whole thing can be disassembled to a pile of parts, then reassembled, adjusted, and set going again without tools.
The obvious caveat, here, is that these are CG renderings of a concept design. Even relatively simple devices and mechanisms tend to breed unexpected problems in the transition from virtual to actual, and, IMNSHO, the cat’s not really in the bag until you’ve made a real one in the real world. Still, pretty delightful mechanical design here. It’s called “Grand Central,” from Swedish freelance designers Sanna Lindström and Sigrid Strömgren. [Thanks, Billy Baque!]
Keith Newstead has been refining this design for twenty years. It shows. It’s gorgeous just sitting there, but when it starts to move…well, I think I audibly sighed. [via The Automata / Automaton Blog]
Just this morning Cory Doctorow blogged this snapshot, taken by one “Joel,” of an ancient gear burial ground at a scrapyard near Charlotte, NC. I wonder how many wild-eyed steampunks they’ve had come sniffing around since then. [via Boing Boing]
Yes, this is a missile. Sorry about that. But it turns out the AIM-9 Sidewinder is the only well-documented example I can find, on the web, of a machine that employs these interesting little widgets called “rollerons.” See the little metal pinwheels at the trailing corners of the fins? The rolleron is basically an air-driven gyroscope, as Tom Harris explains over on How Stuff Works:
YouTuber 36AM3B has lots of cool deployable-structure models in his channel, including an expanding frame (visible to the rear in this video) made from 5 of these 6-bar linkages. I got interested in Bricard linkages because of this recent model from Thingiverse user raju, which purports also to be a 6-bar Bricard linkage but looks, to me, an awful like what I’ve always called a kaleidocycle or flexahedron.
Apparently I’m not the only one charmed by the simple elegance of the Geneva wheel movement (Wikipedia). Thingiverse users PrintTo3D and raumfahrtagentur have created printable and laser-cut-able versions, respectively, of the classic mechanism. PrintTo3D has also posted a YouTube video showing the final printing, assembly, and action of his model.
