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Boing Boing Video teamed up with Theo Gray and Popsci.com to produce this video that demonstrates how you can mold steel with electrochemical machining, using a soft, cheap piece of tin -- without any physical contact. Theo is the author of the book Mad Science, in which many other experiments like this are featured. Theo says:
I remember seeing a demonstration of a seemingly magic process at an engineering open house decades ago, in which a soft metal bit carved detailed shapes into far harder metals. It's called electrochemical machining (ECM), and it's so simple in principle that you can do it at home with a drill press, a battery charger and a pump for a garden fountain.
Read the whole HOWTO over at popsci.com: Carve Steel with Saltwater, Electricity and a Tin Earring
ECM is basically electroplating in reverse. In electroplating, you start with a solution of dissolved metal ions and run an electric current through the liquid between a positive electrode and the object you want to plate (the negative side). The ions deposit themselves as solid metal onto the surface of the object.
Image below: "The tin peace-sign earring acts as an electrode, etching away the metal in the hardened steel washer [left]. The imperfect results are due to the difficulty of manually maintaining an exact thousandths-of-an-inch distance between the two. Commercial electrochemically machined pieces, like this microturbine for a water pump, use sophisticated electronics to monitor the current flow and carve precise pieces [right]. (Courtesy ECM Technologies BV/ ECM Productions BV; Mike Walker)
Quindar is a fantastically far out project to remix NASA’s weird and wonderful sound and film archives into a new audiovisual experience of electronic music and video cut-ups. Created by my friends Mikael Jorgensen of Wilco and art historian/curator James Merle Thomas, Quindar’s recordings and live performances are a wonderful hyperreal trip into the human […]
The EVO evolution webshop offers this fantastic flipbook of human evolution. It’s €7.50. (via /r/educationalgifs)
It’s been years since the major pharma companies agreed to participate in the Registry of All Trials, meaning that they’d end the practice of only reporting on trials whose outcomes they were pleased with, leaving about half of all trials unreported-on.
If you often find yourself far away from AC power, or just want to guarantee that you’ll have GPS access on your next camping trip, the SolarJuice External Solar Battery is an excellent companion for outdoor adventures. It’s currently available in the Boing Boing Store for $59.99.The SolarJuice has a 26,800 mAh battery capable of […]
Between election hacks, ransomware, and Devil’s Ivy, the cybersecurity space is booming as malware and hackers become more sophisticated. If you’re interested in pursuing a career in ethical hacking, or just want to secure your own devices, The Super-Sized Ethical Hacking Bundle is a great resource.In this bundle, you’ll learn the fundamental skills of ethical hacking, prepare […]
The TREBLAB X11 Earphones are versatile, offer great sound, and are currently $32.99 in the Boing Boing Store.These Bluetooth earbuds are a great workout companion. They’re totally sweat proof and their ear-fins keep them snugly in place during high activity — something that Apple’s AirPods can only do if you were blessed with precisely the […]