The other day I saw a plastic part that was so beautiful that I had to look twice to realize it hadn’t been cast — and no, it didn’t come out of a Stratysys or anything, just a 3D printer that probably cost $1,500. It struck me that someone who had paid an artisan to make a mold and cast that part might end up spending the same amount as that 3D printer. It also struck me that the little guys are starting to catch up with the big guys.
Haz Bridgeport, Will Mill
Sometimes it’s just a matter of getting a hold of the equipment. If you need a Bridgeport mill for your project, and you don’t have one, you have to pay for someone else to make the thing — no matter how simple. You’re paying for the operator’s education and expertise, as well as helping pay for the maintenance and support of the hardware and the shop it’s housed in.
I once worked in a packaging shop, and around 2004 we got in a prototype to use in developing the product box. This prototype was 3D printed and I was told it cost $12,000 to make. For the era it was mind blowing. The part itself was simplistic and few folks on Thingiverse circa 2017 would be impressed; the print quality was roughly on par with a Makerbot Cupcake. But because the company didn’t have a 3D printer, they had to pay someone who owned one a ton of cash to make the thing they wanted.
Unparalleled Access to Formerly Professional-Only Tools
But access to high end tools has never been easier. Hackerspaces and tool libraries alone have revolutionized what it means to have access to those machines. There are four or five Bridgeports (or similar vertical mills) at my hackerspace and I believe they were all donated. For the cost of membership, plus the time to get trained in and checked out, you can mill that part for cheap. Repeat with above-average 3D printers, CNC mills, vinyl cutters, lasers. The space’s South Bend lathe (pictured) is another example of the stuff most people don’t have in their basement shops. This group ownership model may not necessarily grant you the same gear as the pros, but sometimes it’s pretty close.
Continue reading “The Narrowing Gap Between Amateur and Professional Fabrication”
[Irene Posch] is big into
knitted fabric circuits. And while most of the textile circuits that we’ve seen are content with simply conducting enough juice to light an LED, [Irene]’s sights are set on knittable crafted arithmetic logic units (ALUs). While we usually think of transistors as the fundamental building-blocks of logic circuits, [Irene] has developed what is essentially a knit crochet relay. Be sure to watch the video after the break to see it in construction and in action.
The basic construction is a coil of conductive thread that forms an electromagnet, and a magnetic bead suspended on an axle so that it can turn in response to the field. To create a relay, a flap of knit conductive thread is attached to the bead, which serves as the pole for what’s essentially a fabric-based SPDT switch. If you’ve been following any of our relay-logic posts, you’ll know that once you’ve got a relay, the next step to a functioning computer is a lot of repetition.
How does [Irene] plan to display the results of a computation? On knit-and-bead flipdot displays, naturally. Combining the same electromagnet and bead arrangement with beads that are painted white on one side and black on the other yields a human-readable one-bit display. We have an unnatural affinity for flipdot displays, and making the whole thing out of fabric-store components definitely flips our bits.
Anyway, [Irene Posch] is a textile-tech artist who you should definitely be following if you have any interest in knittable computers. Have you seen anything else like this? Thanks [Melissa] for the awesome tip!
Continue reading “Knitting ALUs (and Flipdots)”
The ‘Gonk’ droids from the Star Wars universe are easy to overlook, but serve the important function of mobile power generators. Here on Earth, [bithead942]’s life-size replica droid fulfills much the same purpose.
Cronk — functionally an oversized USB charging hub with a lot of bells and whistles — is remotely controlled by a modified Wii Nunchuck very controller similar to the one [bithead942] used to control his R2-D2. With the help of an Adafruit Audio FX Mini, an Adafruit Class D 20W amp, and two four-inch speakers, the droid can rattle off some sound effects as it blows off some steam(really, an inverted CO2 duster). An Arduino Mega acts as Cronk’s brain while its body is sculpted from cast-able urethane foam for its light weight and rigidity. It also houses a FPV camera, mic, and DVR so it can be operated effectively from afar.
And, it can dance!
Continue reading “Cronk The Gonk Droid”
In the category of first world problems, it seems that these days no one is happy with just a plain old soldering iron. Today, everyone wants a station with bells, whistles, and features. If all you have is the iron, take heart. Grab a soda, drink it, and then duplicate [Kalvin178’s] makeshift solder station.
The idea is simple: cut or tear a soda can and press in the sides to make a V-shaped holder for the iron. A smaller part of the can might hold a wet paper towel, a sponge, or some copper scrubbing pads to clean your tip.
Continue reading “Field Expedient Quenches Your Thirst for a Soldering Station”
[Scott] created an LED candle in preparation for the big mac daddy storm (storms?) coming through. Like millions of other people in Florida, he was stuck at home with his roommates when an oncoming hurricane headed their way. Worrying about blundering about in the dark when the power inevitably went out, they set off to gather up all of the candles they had lying around. Realizing the monstrous pile of candles and matches looked more and more like a death wish, the decision was made to create a makeshift light out of what components they had on hand. Now, not having access to any outside sources for parts means that you are going to have a bare bones model.
That being said, this straightforward light only takes a couple of seconds to put together. Jury rig a couple of AA or AAA batteries up, then slap on a resistor, LED, and jumper to get that sucker running. Wrap electrical tape around the whole thing, or even try duct tape, whatever gets the job done. A little paper hat on top of it will diffuse the light and bada bing, bada boom, you’re all done. Generally though, soldering directly onto a battery is not a wise idea. So, if you want to get fancy, perhaps a better alternative is to have a battery casing as shown below.
This LED candle is a clear option if your home isn’t a micro warehouse for electronic components (apparently it is frowned upon to clog up your garage for projects), and you have limited time. However, if you have a number of extra minutes lying around before your windows blow in, see if you can top the brightest flashlight ever made (thus far). Continue reading “Need a Night-Light?”
When it comes to making music, there are really only a few ways to create the tones needed — pluck something, blow into something, or hit something. But where does that leave this dry-ice powered organ that recreates tunes with wind chimes and blocks of solid CO2?
It turns out this is firmly in the “hit something” camp, as [Leah Edwards] explains of her project. When the metal wind chime tubes come in contact with dry ice, the temperature difference sublimates the solid CO2. The puff of gas lifts the tube slightly, letting it fall back against the brick of dry ice and making a tone. The process is repeated rapidly, providing a vibrato effect while the tube is down. [Leah] used solenoids to lift the tubes and, having recently completed a stint at National Instruments, a bunch of NI gear to control them. The videos below show a few popular tunes and a little bit about the organ build. But what — no songs from Frozen?
We can easily imagine this same build using an Arduino or some other microcontroller. In fact, it puts us in mind of a recent reed organ MIDI project that has a few ideas to offer, like ways to quiet those solenoids. Continue reading “Wind Chimes and Dry Ice Make an Unusual Musical Instrument”
[Hanno Böck] recently uncovered a vulnerability in Apache webserver, affecting Apache HTTP Server 2.2.x through 2.2.34 and 2.4.x through 2.4.27. This bug only affects Apache servers with a certain configuration in
.htaccess file. Dubbed Optionsbleed, this vulnerability is a use after free error in Apache HTTP that causes a corrupted Allow header to be replied by the webserver in response to HTTP OPTIONS requests. This can leak pieces of arbitrary memory from the server process that may contain sensitive information. The memory pieces change after multiple requests, so for a vulnerable host an arbitrary number of memory chunks can be leaked.
Unlike the famous Heartbleed bug in the past, Optionsbleed leaks only small chunks of memory and more importantly only affects a small number of hosts by default. Nevertheless, shared hosting environments that allow for
.htaccess file changes can be quite sensitive to it, as a rogue
.htaccess file from one user can potentially bleed info for the whole server. Scanning the Alexa Top 1 Million revealed 466 hosts with corrupted Allow headers, so it seems the impact is not huge so far.
The bug appears if a webmaster tries to use the “Limit” directive with an invalid HTTP method. We decided to test this behaviour with a simple
.htaccess file like this:
Continue reading “OptionsBleed – Apache bleeds in uncommon configuration”