MIT students Grant Jordan and Kyle Vogt found themselves in possession of a high-security safe -- the S&G 8400, a class-1 safe of the sort formerly used to store classified documents. They wanted to open it, but they lacked the combination and were unable to crack it using the sort of techniques that work on lesser strongboxen. So they build a safecracking robot that autodialled combination after combination (the robot excluded "impossible" combinations that couldn't be set due to material limitations of the mechanism, which substantially reduced the keyspace). They eventually opened the safe, but didn't find anything interesting in it.
We used a custom stepper motor to rotate the dialer head. The dialer head transmits torque to the dial via a piece of heavy duty surgical tubing. The stepper motor we chose has more than enough resolution to implement our algorithm, but it's not quite as fast as it could be. Stepper motors have an extremely high "holding torque", which is ideal in this situation since the dial must be held in place while the butterfly knob is being turned.
The head also contains an RC servo motor with a machined knob to mesh with the butterfly knob. This setup enables independent rotation of both the dial and butterfly knob. The stepper motor shaft is also connected to a high resolution optical encoder for position feedback. The encoder is mainly used to detect when safe is successfully opened. The torque required to open the safe when the correct combination is entered is much higher than the maximum torque of the stepper motor, so the encoder is programmed to report when the position error exceeds a certain threshold. Basically, the stepper motor stalls and the encoder flips out if the safe actually opens.
I’ve been using Stanley’s classic flask for years (I literally packed one, full of nice bourbon, in my suitcase this morning for the Melbourne/Sydney/Berlin trip I’m leaving on tonight), and I have no complaints: it’s beautiful, easy to close, and rugged.
Mattel’s Hello Barbie has a microphone and a wifi interface, and it transmits the phrases it hears to a central server in order to parse them and formulate a response. Mattel claims that the data isn’t being retained or harvested for marketing purposes, and assures parents that they can make Barbie stopping eavesdropping on them […]
I blogged the announcement of the Qwerkywriter more than a year ago, when the company was retooling from its successful kickstarter to full retail production. I’ve had one of the production models in my office for a couple of months now and I’ve been very impressed! (I wrote this review on it).
Carrying this EDC card is like slinging around a handheld toolbox wherever you go. Its minimal design is small enough to fit in your wallet’s billfold, and it’s TSA-compliant so you’ll never leave it behind. It’s got hex wrenches, metric and imperial rulers, flathead and Phillip’s screwdrivers, and a bottle opener so that you’re ready […]
Today only take an additional 15% off the below drones today using coupon code: DRONE15 at checkoutThe Code Black is our top-selling drone of all time—and for good reason. This powerful, palm-size drone is not only insanely fun to fly, but can capture some serious video footage from up above. With a flight time of […]
Why interrupt your post-Thanksgiving turkey bliss to wait in an epic line, when the best deal of the season is a click away? We’re treating you Mac enthusiasts to the ultimate Black Friday bundle, packed with apps to give your machine a mega boost in the right direction. From Drive Genius to AfterShot Pro to […]