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TwoBitCircus: The Business of Building Interactive Entertainment

พุธ, 10/15/2014 - 03:00

The Hackaday 10th anniversary was an awful lot of fun, and part of what made it awesome was all the cool things that the community brought to the event. We hadn’t really had a chance to get down to meet the guys from TwoBitCircus before now but they were more than happy to bring along their excellent Hexacade machine. The 6-player custom built arcade game that was an absolute blast!

After the party TwoBitCircus’ fearless leaders [Brent Bushnell] and [Eric Gradman] invited us over to their space for a quick look at their workshop, and to give us a personal invite to the Hacker Preview day for their upcoming STEAM Carnival. No this isn’t Steam as in Steam-punk, but STEAM as in Science Technology Engineering Art and Mathematics.

Their space is really quite amazing, part of The Brewery Art Colony near downton Los Angeles. The building is actually an old steam power plant with incredibly high ceilings. The TwoBitCircus crew is now about 30 people all building interactive games and art pieces for events. They call themselves a digital circus and a lot of their work harkens back to old carnival games of yore with a new digital twist.

[Eric] and [Brent] spared a few minutes to give us a quick run down of what sort of games to expect at the STEAM Carnival. There will be a wide array of entertainment: giant marble runs controlled by see-saws, whack-a-mole/twister mashups on huge glowing button walls, laser based foosball, and the more extreme immolation dunk tank! It will be a most entertaining and educational event. The main public days are on the weekend of 25th – 26th of October, but there is an invite only hacker preview for the local community on Thursday October 23rd which we will be attending. If you’d like to go to the main event, use the code HACKADAY for $5 off the ticket price of $25.

What was most interesting about TwoBitCircus for me as a maker of things was how these guys have turned their hobby into a thriving events business. Brent tells us that they’ve been at this for 8 years now and the company has been around for 3. They’re doing pretty well too, making incredible things for some of the biggest companies around. This really is the best possible job for any inventive hacker sort, building crazy stuff all day for people to play with! I left the place feeling incredibly envious.

Check out the photos below for some impression of the sort of craziness you might see at the carnival!

Filed under: misc hacks

Retrotechtacular: Core Competencies

พุธ, 10/15/2014 - 00:00

As the dashing officer shown above will tell you, early data processing machines and ADP systems employed two types of magnetic cores for memory and other purposes. This 1961 U.S. Army training film is an introduction to the properties of ferrite cores, which are commonly made from nickel alloy and other magnetic materials. As this is only part one of a series, the metallic ribbon type of magnetic core is covered in some other segment we have yet to locate.

The use of magnetic cores for random access memory was built upon transformer theory and provided a rugged and low-power solution until the semiconductor came into vogue. Before that time, the humble ferrite core served many uses and did so very well. The Apollo Guidance Computer had erasable magnetic core memory, and much of its software was stored in core rope memory.

The film covers a lot of theory and does so clearly and concisely. It begins by explaining what a magnetic core is and why it’s used, and then moves on to describe how the cores are used to store bits and the method by which they can transfer information to other cores. Along the way, it provides background on bi-stable devices and provides explanation of magnetization behavior in terms of magnetizing force and flux density.

Essentially, a core can be magnetized in two directions based on the winding’s direction and the end of the conductor at which a current is introduced. The magnetizing force exerted is proportional to the amount of current flowing through it multiplied by the number of turns on the winding. As the magnetic force upon a core increases, the graphed curve showing the relationship between the magnetizing force H and the flux density B eventually flattens out as the saturation point is reached. When the flow of current stops or is reduced, the core material retains most of its magnetism, and this is known as its residual magnetism.

In order to overcome the residual magnetism of a core, a certain amount of magnetic force referred to as coercive force is needed. Once this force has brought the flux density back to zero, the curve can move toward the opposite saturation limit. Between these limits, the hysteresis loop can be determined.

In order to influence a second core, the output winding of the first core is linked to the input winding of the second core. A shift winding is introduced on each core to prevent the binary state from switching back to its original value. In closing, the dashing officer will explain the simplified logic diagram representing what you’ve just learned.

[Thank you to Martin for sending this in]

Retrotechtacular is a weekly column featuring hacks, technology, and kitsch from ages of yore. Help keep it fresh by sending in your ideas for future installments.

Filed under: Hackaday Columns, Retrotechtacular

A Clever Cardboard Computer

อังคาร, 10/14/2014 - 21:01

Back in the 70’s when computers were fairly expensive and out of reach for most people, [David Hagelbarger] of Bell Laboratories designed CARDIAC: CARDboard Illustrative Aid to Computation. CARDIAC was designed as an educational tool to give people without access to computers the ability to learn how computers work.

The CARDIAC computer is a single-accumulator single-address machine, which means that instructions operate on the accumulator alone, or on the accumulator and a memory location. The machine implements 10 instructions, each of which is assigned a 3-digit decimal opcode. The instruction set architecture includes instructions common to simple Von Neumann processors, such as load, store, add/subtract, and conditional branch.

Operating the computer is fairly simple–the cardboard slides guide you through the operation of the ALU and instruction decoder, and the flow chart shows you which stage to go to next. The program counter is represented by a cardboard ladybug which is manually moved through the program memory after each instruction completes.

Even though the CARDIAC is dated and very simplistic, it is still a useful tool to teach how microprocessors work. Although modern processors include multi-stage pipelines, finely-tuned branch predictors, and numerous other improvements, the basic principles of operation remain the same.

Feeling adventurous? Print out your own CARDIAC clone and try writing your first cardboard computer program.

[via Reddit]

Filed under: computer hacks

New Brain for an Old Washing Machine

อังคาร, 10/14/2014 - 18:00

When the washing machine at [hydronucleus]‘s place went on the fritz, he went straight to the toolbox to try to repair it. The problem was with the old mechanical control unit, so [hydronucleus] got an Arduino out of the parts bin to create a brand new electronic controller for his washing machine. (Imgur Link)

The old mechanical controller functioned like a player piano. A rotating drum with ridges actuate different cycles in the washing machine. Some of the cycles weren’t working properly so [hydronucleus] ripped them out. With the help of a schematic posted on the washing machine itself, the cycles were able to be programmed into the Arduino.

The other obstacle in this repair was getting enough relays together to switch everything in the washing machine. This was solved with a Sainsmart 16 relay block, which has more than enough relays for the job. [hydronucleus] wired up an LCD and a pushbutton to control it and his washing machine is as good as new! The cost of the repair certainly beats a new machine, too. Although if it finally gives up the ghost completely, he could always turn it into a windmill.

Want to read more about [hydronucleus]‘s washing machine hack? Check out his Reddit thread!

Filed under: home hacks

Introducing USB Armory, a Flash Drive Sized Computer

อังคาร, 10/14/2014 - 15:01

[Andrea] tipped us about USB armory, a tiny embedded platform meant for security projects. It is based on the 800MHz ARM Cortex-A8 Freescale i.MX53 together with 512MB of DDR3 SDRAM, includes a microSD card slot, a 5-pin breakout header with GPIOs/UART, a customizable LED and is powered through USB.

This particular processor supports a few advanced security features such as secure boot and ARM TrustZone. The secure boot feature allow users to fuse verification keys that ensure only trusted firmware can be executed on the board, while the ARM TrustZone enforces domain separation between a “secure” and a “normal” world down to a memory and peripheral level. This enables many projects such as electronic wallets, authentication tokens and password managers.

The complete design is open hardware and all its files may be downloaded from the official GitHub repository. The target price for the final design of the first revision is around €100.

Filed under: hardware

Your Halloween Costume May Be Cool, But It’s Not Laser-Cut Cardboard Vintage Airplane Cool

อังคาร, 10/14/2014 - 12:00

While others are absorbed in baseball playoffs, [Aidan] has spent his recent Octobers planning incredible Halloween costumes for his son. We don’t know what he did last year, but there’s no way it’s better than this laser-cut cardboard airplane costume.

He had a few specs in mind and started with a model of a Grumman F4F-4 Wildcat from 3D Warehouse. Using SketchUp, he simplified the model and removed the landing gear and the propeller. [Aidan] created a simpler model on top of that, and set to work changing the proportions to make it adorable and toddler-sized.

To build around his son’s proportions, he inserted a 10-inch diameter scaled tube vertically into the model and squished down the fuselage in SketchUp. The plan was to have it laser-cut by Ponoko, which meant turning the design into flat pieces for them to cut. He ended up with 58 parts, many of them mirror images due to the symmetry of his design.

When the box from Ponoko arrived, [Aidan] was giddy. He was astonished at the quality of the pieces and found the plane very satisfying to build. But, he didn’t stop there. Using LayOut, he created a custom instrument cluster with reflections and shadows. The plane also has a Wii steering wheel, a motorized propeller, and of course, decals.

Filed under: wearable hacks

Writing a Message in Hypnotizing Style

อังคาร, 10/14/2014 - 09:01

If you’ve ever encountered a rapidly spinning split-flap displays at an airport terminal, it’s hard not to stop and marvel at them in action for a few extra seconds. Because of this same fascination, [M1k3y] began restoring an old one-hundred and twenty character sign, which he outlines the process of on his blog.

Finding documentation on this old relic turned out to be an impossibility; the producers of the model themselves didn’t even keep it off-hand any longer. In spite of that, [M1k3y] was able to determine the function of the small amount of circuitry driving the sign through process of elimination by studying the components. After nearly a year of poking at it, he happened across a video by the Trollhöhle Compute Club, demonstrating the successful use of the same display model. Luckily, they were kind enough to share their working source code. By reverse engineering the serial protocol in their example, he was able to write his own software to get the sign moving at last.

Once up and running, [M1k3y] learned that only eighty of the sign’s characters were still operable, but that is plenty to make a mesmerizing statement! Here is a video of the cycling letters in action:

Filed under: hardware, misc hacks

3D Printing Models From Computer Games

อังคาร, 10/14/2014 - 06:00

Wouldn’t it be cool to extract 3D models from your favorite video games and then 3D print them? As it turns out, it’s pretty easy to do!

In the following video tutorial he shows us how to extract the 3D meshes from a video game called Chivalry, Medieval Warfare. The game is based on the unreal engine which makes it super easy to get the files.

Quick note on legality: If you choose to rip 3D models from your video games and print them, make sure you’re just printing them for yourself, not to sell. 

To start, you’ll need a few pieces of software to help you out. First up is something called Umodel, which is an Unreal Engine Resource Viewer, which allows you to view and extract files from any game that uses the Unreal Engine. Once you find your model in the game directory, you can open it up in Umodel and save it as a .PSK file. From there you can open .PSK files with another program called Milkshape 3D, and then export in .OBJ file. Finally you can use MeshMixer to import .OBJ files, repair the mesh by removing the extra shells (you can use the cloud NetFabb service to help repair files for 3D printing as well), and then finally save as .STL ready to print.

Easy right?

[Angus Deveson] is an industrial designer at 3D Printing Studios in Perth, Australia. His goal is to make all kinds of tools for 3D printing easy and accessible for everyone to use, which is why he’s started the YouTube channel Maker’s Muse, creating tutorials like this one.

Filed under: 3d Printer hacks

UC Davis Researchers Use Light to Erase Memories in Genetically Altered Mice

อังคาร, 10/14/2014 - 03:00

Much like using UV light to erase data from an EPROM, researchers from UC Davis have used light to erase specific memories in mice. [Kazumasa Tanaka, Brian Wiltgen and colleagues] used optogenetic techniques to test current ideas about memory retrieval. Optogenetics has been featured on Hackaday before. It is the use of light to control specific neurons (nerve cells) that have been genetically sensitized to light.  By doing so, the effects can be seen in real-time.

For their research, [Kazumasa Tanaka, Brian Wiltgen and colleagues] created genetically altered mice whose activated neurons expressed GFP, a protein that fluoresces green. This allowed neurons to be easily located and track which ones responded to learning and memory stimuli. The neurons produced an additional protein that made it possible to “switch them off” in response to light.  This enabled the researchers to determine which specific neurons are involved in the learning and memory pathways as well as study the behavior of the mouse when certain neurons were active or not.

Animal lovers may want to refrain from the following paragraph. The mice were subjected to mild electric shocks after being placed in a cage. They were trained so that when they were put in the cage again, they remembered the previous shock and would freeze in fear. However, when specific neurons in the hippocampus (a structure in the brain) were exposed to light transmitted through fiber optics (likely through a hole in each mouse’s skull), the mice happily scampered around the cage, no memory of the earlier shock to terrify them. The neurons that stored the memory of the shock had been “turned off” after the light exposure.

The researchers could see from this study that the mouse brain’s cortex, hippocampus, and amygdala are all connected and involved in learning, creating, and retrieving memories. Thus was long suspected but took optogenetics to clearly illustrate. We did not see any clear information on whether the “off” neurons were ever turned “on” again for the purposes of this study; it would have interesting to conclusively see if any of the fear response returned in the mice when this occurred.

As exciting as this research is, we’re still a long way off from scenarios like Eternal Sunshine of the Spotless Mind, the advent of neuralyzers, or treatment of memory disorders in humans using optogenetics. Still, we are impressed with the results and hope to see more studies about the science of memory in the future.

Here is a video explaining optogenetics:

[via Techodrom]

Filed under: Medical hacks

Announcing the Five Finalists for The Hackaday Prize

อังคาร, 10/14/2014 - 00:13

Six months ago we challenged you to realize the future of open, connected devices. Today we see the five finalists vying for The Hackaday Prize.

These five were chosen by our panel of Launch Judges from a pool of fifty semifinalists. All of them are tools which leverage Open Design in order to break down the barriers of entry for a wide range of interests. They will have a few more weeks to polish and refine their devices before [Chris Anderson] joins the judging panel to name the winner.

Starting on the top left and moving clockwise:

ChipWhisperer, an embedded hardware security research device goes deep into the world of hardware penetration testing. The versatile tool occupies an area in which all-in-one, wide-ranging test gear had been previously non-existant or was prohibitively expensive to small-shop hardware development which is so common today.

SatNOGS, a global network of satellite ground stations. The design demonstrates an affordable node which can be built and linked into a public network to leverage the benefits of satellites (even amateur ones) to a greater extent and for a wider portion of humanity.

PortableSDR, is a compact Software Defined Radio module that was originally designed for Ham Radio operators. The very nature of SDR makes this project a universal solution for long-range communications and data transfer especially where more ubiquitous forms of connectivity (Cell or WiFi) are not available.

ramanPi, a 3D printed Raman Spectrometer built around a RaspberryPi with some 3D printed and some off-the-shelf parts. The design even manages to account for variances in the type of optics used by anyone building their own version.

Open Source Science Tricorder, a realization of science fiction technology made possible by today’s electronics hardware advances. The handheld is a collection of sensor modules paired with a full-featured user interface all in one handheld package.

From Many, Five

The nature of a contest like the Hackaday Prize means narrowing down a set of entries to just a few, and finally to one. But this is a function of the contest and not of the initiative itself.

The Hackaday Prize stands for Open Design, a virtue that runs far and deep in the Hackaday community. The 50 semifinalists, and over 800 quarterfinalists shared their work openly and by doing so provide a learning platform, an idea engine, and are indeed the giants on whose shoulders the next evolution of hackers, designers, and engineers will stand.

Whether you submitted an entry or not, make your designs open source, interact with the growing community of hardware engineers and enthusiasts, and help spread the idea and benefits of Open Design.

Filed under: Featured, The Hackaday Prize

BORAT: Bathroom Monitor for the Future

จันทร์, 10/13/2014 - 21:00

A recent company move has left [kigster] and his 35 coworkers in a frustrating situation. Their new building only has two single occupancy bathrooms. To make matters worse, the bathrooms are located on two different floors. Heading to one bathroom, finding it occupied, then running upstairs to find the second bathroom also occupied became an all to common and frustrating occurrence at the office.

It was obvious the office needed some sort of bathroom occupancy monitoring system – much like those available on commercial aircraft. [kigster] asked for a budget of about $200 to build such a system. His request was quickly granted it by office management. They must have been on their way to the bathroom at the time.

[kigster] began work on BORAT: Bathroom Occupancy Remote Awareness Technology. The initial problem was detecting bathroom occupancy. The easiest method would be to use door locks with embedded switches, much those used in aircraft. Unfortunately, modifying or changing the locks in a rented office space is a big no-no. Several other human detection systems were suggested and rejected. The final solution was a hybrid. Sonar, Passive Infrared (PIR), and light sensors work in concert to detect if a person is in the bathroom. While we think the final “observer unit” is rather cool looking, we’re sure unsuspecting visitors to the office may be wondering why a two eyed robot is staring at them on the throne.

The display side of the system was easy. The entire system communicates with the venerable nRF24L01+ radio modules, so the display just needed a radio module, an arduino, and a way of displaying bathroom status. Two LED matrices took care of that issue.

We really like this hack. Not only is it a great use of technology to solve a common problem, but it’s also an open source system. BORAT’s source code is available on [kigster's] github.

Want to know more about BORAT? Kigster is answering questions over on his thread in the Arduino subreddit.

Filed under: Arduino Hacks

Mooltipass Installation Process is Now Dead Simple

จันทร์, 10/13/2014 - 18:00

In a few weeks the Hackaday community offline password keeper will reach a crowdfunding platform. This is a necessary step as only a high production volume will allow our $80 early bird perk target. We’ll therefore need you to spread the word.

Thanks to the Chromium development team, a few days ago the Mooltipass installation process became as simple as installing our app & extension. As you may remember, our device is enumerated as composite HID proprietary / HID standard keyboard. This makes it completely driverless for all operating systems and enables standalone operation as the Mooltipass can type logins and passwords selected through its user interface. Management communications are therefore done through the Mooltipass HID proprietary interface, which Chrome 38 now natively supports through its chrome.hid API. The simpler our installation process is, the more likely the final users will appreciate the fruit of our hard labor.

As our last post mentioned there’s still plenty of space for future contributors to implement new functionalities. Our future crowdfunding campaign will allow us to find javascript developers for the remaining app & extensions tasks and also implement other browsers support. Want to stay tuned of the Mooltipass launch date? Subscribe to our official Google Group!


Filed under: Hackaday Columns

Robotic Farms Invade Urban Landscapes

จันทร์, 10/13/2014 - 15:00

Now there is no excuse to not have a garden, even if you are located in an urban area. The Robotic Urban Farm System (RUFS for short) solves the problems of growing many plants in a small area. The system’s high plant density is attributed to it’s vertical orientation. The entire system is even made from easy to find parts from your local hardware store. The water usage is keep to a minimum thanks to the closed loop watering system. Instead of flowing down into the ground, any excess water is collected and saved for use later.

Plants are placed in holes made in the side of a standard plastic downspout that hangs from a PVC frame, each hole several inches apart from it’s neighbor. A standard plastic plant pot is place inside each hole and is filled with hydroponic media. That’s right, there is no dirt in this system. Plants will grow happily in the hydroponic media providing they get all the nutrients and water they need.

The potential urban farmer may not be super excited about tending to his crops. This is where the robot portion of the RUFS system comes into play. There are two control systems that work independantly of each other. The first is for indoor applications and controls light cycles and circulation fans. The second is a little more complex and controls the watering portion of the system. Not only does it water the plants at pre-determined intervals but it also monitors the pH, nutrient and water levels inside the reservoir. Both these systems are Arduino-based. For extreme control freaks, there is one more add-on available. It’s Raspberry Pi based and has an accompanying mobile app. The Pi records and logs sensor data from the Arduinos and also allows remote updating of the watering and light schedules. The mobile app lets you not only look at current conditions of the system but also displays the historical data in a nice visual graph.

Filed under: green hacks

Mechanical Bird Actually Flies by Flapping its Wings

จันทร์, 10/13/2014 - 12:00

Turns out you don’t have to be a multi-million dollar corporation like Festo to create a remote controlled, flapping bird robot. [Kazuhiko Kakuta] is a medical Doctor of Allergy, and in his free time he likes to build flying mechanical birds with his son.

It has just over a meter wingspan, weighs 193 grams, and it flies by flapping its wings. The majority of its components are 3D printed. If that’s not impressive enough for you as is, consider this. It it has no sensors, no gyroscopes or anything — it’s all manually controlled by [Kazuhiko].

And this isn’t even the only ornithopter he’s done. He’s also created something out of an anime film, Castle in the Sky. He even sells the designs for one of them, to be printed via Shapeways.

Previously we’ve only seen an ornithopter this large like this one done by Festo, which makes [Kazuhiko's] work even more impressive.

[Thanks Nickson!]

Filed under: 3d Printer hacks

Custom Video Streaming Box

จันทร์, 10/13/2014 - 09:00

There are a lot of options out today for streaming video to your Internet-connected devices. Whether it’s Hulu, Netflix, Slingbox, or the late Aereo, there is no shortage of ways to get your TV fix. However, [Jaruzel] wasn’t happy with any of these services and wanted a more custom solution, so he built his own TV-streaming box out of hardware he had lying around.

[Jaruzel] gets TV from a service called SkyTV, but wanted to be able to stream it to his tablet, laptop, and XBMC. While rummaging through his parts bin, he came up with a WinTV tuner card for capturing TV and a Mini-ITX board to process everything and stream it out over his network.

Once the computer was put in a custom enclosure, [Jaruzel] got to work installing Puppy Linux. He wrote a boot script that configures the WinTV card and then starts VLC to handle the streaming service which allows him to view the TV stream over HTTP on the network. This is a great hack that would presumably work for any TV stream you can find, even if it’s just an over-the-air source.

Filed under: video hacks

Hackaday Links: October 12, 2014

จันทร์, 10/13/2014 - 06:00

Remember in the late 90s and early 2000s when everything had blue LEDs in them? Blinding blue LEDs that lit up a dark room like a Christmas tree? Nobel prize. There’s a good /r/askscience thread on why this is so important. The TL;DR is that it’s tough to put a p-type layer on gallium nitride.

Have a Segway and you’re a member of the 501st? Here’s your Halloween costume. It’s a model of the Aratech 74-Z speeder bike, most famously seen careening into the side of trees on the forest moon of Endor.

[Andrew] needed something to do and machined an iPhone 5 out of a block of aluminum. Here’s the video of icon labels being engraved. The machine is a Denford Triac with a six station auto tool changer. He’s running Mach3, and according to him everything – including the correct tooling – cost far too much money.

Another [Andrew] was working the LEGO booth at Maker Faire New York and has finally gotten his LEGO Mindstorms Minecraft Creeper build written up. Yes, it’s probably smarter than your average Minecraft Creeper, and this one also blows up. He also had a physical version of the classic video game from 1979, Lunar Lander. Both are extremely awesome builds, and a great way to attract kids of all ages to a booth.

[Wilfred] was testing a titanium 3D printer at work and was looking for something to print. The skull ‘n wrenches was a suitable candidate, and the results are fantastic. From [Wilfred]: “Just out of the printer the logo looks amazing because it isn’t oxidized yet (inside the printer is an Argon atmosphere) Then the logo moves to an oven to anneal the stress made by the laser. But then it gets brown and ugly. After sandblasting we get a lovely bluish color as you can see in the last picture.”

The folks at Lulzbot/Aleph Objects are experimenting with their yet-to-be-released printer, codenamed ‘Begonia’. They’re 2D printing, strangely enough, and for only using a standard Bic pen, the results look great.

Everyone is going crazy over the ESP8266 UART to WiFi module. There’s another module that came up on Seeed recently, the EMW3162. It’s an ARM Cortex M3 with plenty of Flash, has 802.11 b/g/n, and it’s $8.50 USD. Out of stock, of course.

Filed under: Hackaday links

PCB Toner Transfer Method, Now Without The Transfer

จันทร์, 10/13/2014 - 03:01

A common way to create a custom PCB at home is to do what is called the Toner Transfer Method. In this process, the trace layout of the board is printed out on a piece of special toner transfer paper that allows the ink to come off in the following step. The toner transfer paper is then put print-side-down on a copper clad PCB blank, heated and pressed with an iron. The heat and pressure from the iron transfers the toner from the paper to the copper. The exposed copper then is chemically removed, the previously applied toner protects the copper in the pad and trace areas. The toner is then removed using paint thinner.

That is a long process with many critical steps. [mlerman] wondered why no one was printing the toner directly to the PCB. He has been tinkering with printing directly on PCB blanks for 4 years now. He’s made hundreds of boards over that time and can now make a PCB in under 15 minutes.

The obvious route to take would be to modify a current laser printer to accept the much-thicker-than-paper PCB boards. A few printer models were tried but [mlerman] feels the Lexmark E260 works the best due to the cost, internal mechanical components and an easily modifiable manual feed system. There is also a Local Printer Utility that allows the majority of the printer parameters to be adjusted.

As you would expect, there are several portions of the printer that have to be modified. The first is the internal paper platform which has to be clearanced so the PCB won’t run into the toner cartridge. The next part needing a change is the feeder assembly. The rubber rollers were made to grab thin paper, not thick material. To ensure a firm grip of the PCB, a second aluminum idler roller was added. It is pulled against the stock rubber roller by a spring and is essential for slip-less printing. Check out [mlerman's] Instructable for extreme detail of all the changes he had to make to the printer.

The PCB blank is not passed through the printer by itself, it is attached to an aluminum carrier. The aluminum carrier acts as a consistently-sized delivery method when using different sized PCB blanks. [mlerman] has had some great results with this setup, being able to make trace widths all the way down to 0.005 inches. Although he has made some simple two-sided boards, he wants to come up with reliable a process for fabricating more complex designs.

Thanks [Laimonas]

Filed under: peripherals hacks, tool hacks

Ghost Gunner Machines Your AR-15

จันทร์, 10/13/2014 - 00:00

Defense Distributed and founder [Cody Wilson] have released Ghost Gunner. Defense Distributed entered the public eye a couple of years ago with The Liberator, the world’s first 3D printed gun. Since anyone with a 3D printer can print a Liberator, it is effectively untraceable. This raised a lot of questions in the media and public eye.

Ghost Gunner is a variation on the untraceable theme. Essentially, Ghost Gunner is a CNC designed for one purpose: final drilling and milling steps for AR-15 lower receivers. The reason for this has to do with federal gun laws in the United States. According to US law, the lower receiver is the actual firearm, and is regulated. But when does a block of aluminum become a lower receiver? Here, US law states that the metal becomes a regulated receiver when the machining operations are more than 80% complete.

Anyone can legally buy a barrel, trigger, stock, upper receiver, and various other parts to build an AR-15. To complete the weapon, they only need to buy an 80% lower receiver and perform the last 20% of the metal work. This work can be performed with everything from a drill press to a milling machine to hand tools. Ghost Gunner partially automates this process, making it easier and faster to complete lower receivers and build weapons.

Defense Distributed calls Ghost Gunner an open source hardware project, though we were unable to find the files available for download at this time. It appears that the slides are made up of MakerSlide or a similar aluminum extrusion. The steppers appear to be standard Nema 17 size.

Defense Distributed says that they’ve been having a hard time keeping up with the Ghost Gunner pre-orders. At $1300 each though, we think a general purpose mill or small CNC would be a better deal.

Filed under: misc hacks

Bench Top Drill Press Converted To Milling Machine, Mounted To Lathe

อาทิตย์, 10/12/2014 - 21:00

Milling machines are nice to have around for precisely drilling holes or removing unwanted material from a part. However, they can be expensive and may not get a lot of use, two reasons why a mill purchase may not make sense for a home shop. [David] didn’t need a mill, he wanted one and he didn’t want to spend a lot of money. He did have an old bench top drill press and a lathe in his shop and thought it would be a good idea to combine them them into a DIY Milling Machine.

The problem with just throwing a milling bit in a drill press and trying to mill metal is that the drill press spindle ball bearings are not made for radial loading. [David] knew this and replaced the stock ball bearings with angular roller bearings. These new bearings would require an axial preload applied to keep the spindle in place. This was done by machining threads into the spindle’s shaft and adding a nut to secure and preload the new angular roller bearings.

[David] did not have an XY Table to donate to the project so he decided to mount the drill press to his lathe and use the lathe axes to move the work piece around underneath the mill. Thick plate steel was welded together to form a hefty bracket that bolted to both the lathe bed and drill press column. And yes, the lathe is still functional and the changeover process is simple. To go from Mill to Lathe; the work piece is removed from the lathe’s cross slide and replaced with the lathe tool holder. That’s it!

Overall, [David] is happy with his conversion. He doesn’t expect his project to be as precise or rigid as a proper milling machine but says he has no problem cutting 1mm deep passes in steel when using a 6mm diameter mill bit.

Filed under: tool hacks

A Simple Floppy Music Controller

อาทิตย์, 10/12/2014 - 18:00

While playing music with floppy drives has been done many times over, making any device with a stepper motor play music still appeals to the hacker in all of us. [Tyler] designed an Arduino shield and a library which lets you get up and running in no time. [Tyler]‘s shield includes pin headers to connect 4 floppy drives, which plug directly into the shield. The drives don’t need any modification before being used.

While you could simply wire a few floppy drives up to an Arduino with some jumpers, this breakout shield makes connecting your drives trivial. In addition to designing the shield, [Tyler] released an Arduino library to make things even easier. The library lets you simply set the frequency you want each drive to play, which saves a bit of legwork.

The floppy-controlling Arduino library is available on GitHub and a video of the controller is included after the break.

Filed under: musical hacks