Ben Kokes wanted to give a ring to his sweetheart, and to make it interesting, he decided to create a ring with an inductive loop that would cause the stones to light up when they were close to a power-source. He documented the tricky technical problems that cropped up during the build, and it sounds like the romance part came out well, too:
The final idea was to embed a LED and copper coil assembly inside the titanium ring, illuminating it from under the stones when it was in close proximity to an induced alternating magnetic field (henceforth called 'the transmitter'). Autodesk Inventor helped me develop all of the dimensions and constraints for the design. Having some help, I was able to obtain her ring size and the rest of the measurements were based from there (15.72mm if anyone was wondering)...
Of all the challenges presented in making the ring, affixing the stone is the most difficult. Traditionally, stones are affixed by mechanical means -- prongs, groves or snaps. Epoxies will delaminate from the attachment surfaces due to microstresses, thermal cycling, and other unmentioned movements. The stone may be attached now, but eventually it will fall out. It's just a matter of time.
With that in mind, I had 4 initial ideas for affixing the stone: thermally expanding the hole, hole deformation, point expansion deformation, and epoxy. Ultimately, I went with the epoxy method for attaching the stones.
The first test was to try and heat the ring, expand the hold and drop in the stone. When the hole cooled and contracted, it would hold the stone in place. Not only does the hole not expand enough, if I was lucky enough for it to happen (it did once), the stone would fracture along pre-existing crack lines.
(via Hacker News)
You might remember that when I’m not blogging for Boing Boing, I can usually be found at my other gig — Children’s Fairyland. Of course, the Oakland, California kiddie theme park is closed now and will be until it’s safe to reopen. But, we do have a skeleton crew of essential “elves” who are on […]
Anyone who’s ever gone to Burning Man is undoubtedly already familiar with the N95 mask, the particle filters that also protect from inhaling playa dust. And Burners are also familiar with “radical self expression.” So, it comes as no surprise that the happy mutants over at Burner-friendly Grassy Knoll Industries have taken it upon themselves […]
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If you’re looking to become a software engineer or it’s an idea you’ve tossed around half-seriously, there may be no better time than now to take the leap. It’s one of the fastest-growing, most in-demand roles already. And in the midst of the pandemic, between the extra hours you likely have in your day, and […]
Whether you’re looking to create perfect portraits or amazing artwork, if your medium is digital, you know you absolutely must have Photoshop to do your best making. So if you’ve been putting off really mastering the various techniques, tools, and styles it offers for your craft, now is a great time to make it happen. […]
There are few things more satisfying than the clickety-clack of an old keyboard. So old, in fact, that it’s really more of a typewriter sound and feel than that of a keyboard. But if you want to enjoy the benefits of both, check out this Rymek Retro Bluetooth 3.0 Mechanical Keyboard. Bringing you an impressive […]