Choosing between manually changing endmill bits on a CNC machine and investing in an expensive automated solution? Not for [Frank Herrmann], who invented the XATC, an eXtremely simple Automated Tool Changer. [Frank’s] ingenious hack achieves the same functionality as an industrial tool changer using only cheap standard hardware you might have lying around the workshop.
Like many ATCs, this one features a tool carousel. The carousel, which is not motorized, stores each milling bit in the center bore of a Gator Grip wrench tool. To change a tool, a fork wrench, actuated by an RC servo, blocks the spindle shaft, just like you would do it to manually change a tool. The machine then positions the current bit in an empty Gator Grip on the carousel and loosens the collet by performing a circular “magic move” around the carousel. This move utilizes the carousel as a wrench to unscrew the collet. A short reverse spin of the spindle takes care of the rest. It then picks another tool from the carousel and does the whole trick in reverse.
Every hacker has a USB thumb drive on their keyring, filled with backup files and a way to boot up a broken computer. One feature that most are missing though is USB On The Go (OTG) support, which allows a USB device to act as a USB host, connecting to devices like cell phones and tablets.
There are a few caveats, though: it needs a USB thumb drive with solderable headers, which most of the smallest drives that have connectors right on the PCB won’t have. Most of the larger drives will have these, though, and they are cheap, so finding a suitable victim isn’t hard.
Often, CPUs that work together operate on SIMD (Single Instruction Multiple Data) or MISD (Multiple Instruction Single Data), part of Flynn’s taxonomy. For example, your video card probably has the ability to apply a single operation (an instruction) to lots of pixels simultaneously (multiple data). Researchers at the University of California–Davis recently constructed a single chip with 1,000 independently programmable processors onboard. The device is energy efficient and can compute up to 1.78 trillion instructions per second.
The KiloCore chip (not to be confused with the 2006 Rapport chip of the same name) has 621 million transistors and uses special techniques to be energy efficient, an important design feature when dealing with so many CPUs. Each processor operates at 1.78 GHz or less and can shut itself down when not needed. The team reports that even when computing 115 billion instructions per second, the device only consumes about 700 milliwatts.
Unlike some multicore designs that use a shared memory area to communicate between processors, the KiloCore allows processors to directly communicate. If you are just a diehard Arduino user, maybe you could scale up this design. Or, if you want to make use of the unused power in your video card under Linux, you can always try to bring KGPU up to date.
A few months ago, we caught wind of someone doing something remarkable. [Clinton Westwood] built a pistol from plans he found on the Internet. You can find plans to build anything on the web, from houses to four-stroke engines to perpetual motion machines. Most of the time these plans are incomplete and many of these devices have never been built at all. [Clinton]’s pistol was one of these never-built designs. After months of work, he’s ready to call this project done, and managed to build an awesome rig to rifle the barrel.
Before [Clinton] set out to build this gun from scratch, the only other example these plans could build a gun-shaped object were a few terrible pictures of what appears to be a gun that was thrown into a garbage disposal, then into a creek, then forgotten for several years. There is a distinct lack of workmanship in this one exemplar, but [Clinton]’s attempt at replication is far more professional.
Although this gun is designed to be built using simple tools, there is one aspect of amateur gunsmithing that requires some specialized equipment. The barrel must be rifled if you want any accuracy at all, and for this [Clinton] has come up with a very simple jig made out of a broken bicycle and some threaded rod.
If homebrew gunsmithery is your thing, but you’re looking for something with a little more punch than a .25 ACP, you can beat plowshares into an AK-47. All hail the shovel AK, defender of the motherland and digger of holes.
Lots of solutions have been proposed and enacted for multi-color and multi-material 3D printing, from color mixing in the nozzle to scripts requiring manual filament change. A solution proposed fairly early on was to manually splice the filament together, making a custom spool. The printer would print as normal, but the filament would change color. This worked pretty well, but it was tedious and it wasn’t entirely possible to control where the color change happened on the model.
You’ll find some examples of the more successful manual splicing hacks in the pictures below. Scroll down a bit further to find our interview with Mosaic Manufacturing at Bay Area Maker Faire 2016. They have a new product that automates the filament splicing process with precision as the ultimate goal. It unlocks a single extruder printer to behave like a multi-extruder model without stopping and starting.
Mosaic pulled off a very difficult combination of two methods mentioned above. Their flagship product is a machine they’ve dubbed, “Palette”. It’s an automatic filament splicer. Up to four different filaments can feed into Palette, and it will splice them at determined intervals. This would be cool by itself, if only to save the tedium of splicing and winding a custom spool by hand.
The real killer app with Palette, however, is the software that runs alongside it. Palette can take the GCODE output of any properly prepared multi material file from any slicer, and then precisely combine and splice the filament. This can feed into any printer without modifying it, aside from sticking an encoder somewhere in the filament path. The results are indistinguishable from a dual, or quad extruder set-up.
Summer is nearly here, and with that comes the preparations for the largest gathering of security researchers on the planet. In early August, researchers, geeks, nerds, and other extremely cool people will descend upon the high desert of Las Vegas, Nevada to discuss the vulnerabilities of software, the exploits of hardware, and the questionable activities of government entities. This is Black Hat and DEF CON, when taken together it’s the largest security conference on the planet.
These conferences serve a very important purpose. Unlike academia, security professionals don’t make a name for themselves by publishing in journals. The pecking order of the security world is determined at these talks. The best talks, and the best media coverage command higher consultancy fees. It’s an economy, and of course there will always be people ready to game the system.
Like academia, these talks are peer-reviewed. Press releases given before the talks are not, and between the knowledge of security researchers and the tech press is network security theatre. In this network security theatre, you don’t really need an interesting exploit, technique, or device, you just need to convince the right people you have one.
One of the keys to our scientific community is the concept of Peer Review. When important discoveries are made, the work is reviewed by others accomplished in the same field to test the findings. This can verify the work, but it can also open up new questions and lead to new discoveries.
We’re adding Peer Review to the Hackaday Prize. It’s a new way to apply your skills for the benefit of all. The current challenge is Citizen Scientist; calling for projects that help make scientific research more widely available. A set of independent eyes giving constructive feedback to these entries can be a huge end run to success. After all, you don’t know what you don’t know. Having help recognizing stumbling points, or just receiving a second opinion that you’re on the right track makes a big difference when treading in unknown territory.
Becoming a Peer Reviewer is simple. Pick a project you are interested in, review it thoroughly while making notes in a respectful, positive, and constructive way. When you’re ready, submit your Peer Review using this form. We will privately share your review with the project creator.
Hackaday.io is the most vibrant hardware collaboration platform in the world. Peer Review is yet another interesting way to get more brilliant minds in our community involved in building something that matters.