Chris Walker, the author of Getting Started with Netduino, is presenting a free webcast (preregistration required) on Friday, April 13, 2012:
With the recent announcement of the Netduino Go, this will be an interesting webcast!
In the Maker Shed:
VERA is a low cost, low acceleration, compressed charge combustion gun featuring a 40 foot (12.2 m) barrel and a 19 inch (483 mm) bore. VERA was designed to minimize payload acceleration forces, accommodate large and/or oddly shaped projectiles, and allow for in-barrel instrumentation and control of energetic or inert payloads.
And yes, VERA, can best be described as a “potato gun on steroids.” Quite probably the world’s largest and most powerful, but no research to back up such a claim has been made.
On April 1, Inventables made Shapeoko kits available for the first time. No fooling! This low-cost CNC mill comes in three versions and each features the MakerSlide system. This inexpensive kit is quite an achievement and drives home the fact that MakerSlide is an empowering building block for makers. For Edward Ford, the inventor of Shapeoko, this is a watershed moment but it’s been a long time in coming.
Edward’s CNC odyssey started in 2004. While in college, he worked part-time at a manufacturer where he spent his days at a punch machine performing a boring, repetitive task hour after hour. Just across the aisle from him was a giant plasma CNC machine that captivated his imagination with its precision, power, and speed. Weeks went by. The boredom was stifling but the allure of the plasma CNC was intoxicating. His conclusion? “I’ve got to have one of those!”
Who among us hasn’t been caught up in watching CNC perform its magic? While many of us wish for such empowering tools, few of us will set out to build one from scratch. Yet within six months of falling in love with CNC, that’s exactly what Edward set out to do.
On this journey, his first lesson was to get the hardware right. His first CNC project was done with the resources of a student and the result was his first CNC frame, cut and assembled with hand tools in his father’s workshop. While building it was a major achievement, the result was disheartening. Hand-cut hardware assembled imprecisely. Keeping everything square proved a major challenge. If it had been completed and powered with motors then it would have torn itself apart. In despair Edward shelved the project.
His second lesson was to get the electronics right. With new-found access to a laser cutter at work, it became possible to produce precision parts and build a quality frame, which he did. Moving to the next stage, he bought a kit from Xylotek to handle the electronics. It came with stepper motors, controller boards, and a power supply which would bringing his new CNC mill to life. While the electronics would readily perform their function, they had to connect to the hardware which presented new challenges. Establishing good mechanical coupling wasn’t easy. Getting the electronics to drive hardware correctly also didn’t come easy. It took a year of tweaking to get the electronics working well with the hardware. By the end of it, he had climbed major learning curves and was well on his way to conquering CNC.
At this point it was 2007 and Edward was years into the process of mastering CNC building. He had learned about hardware and electronics; it was now time for his third major lesson in getting the software and operations right. He installed EMC2, ran his first test, and experienced the joy of success! He had managed to draw a straight line.
Drawing that line was a major milestone, but obviously only a start. There would be many things still to learn about operating the mill. The concepts of homing, backlash, and learning G-code had to be mastered. He had to familiarize himself with different materials, their speeds and feeds, and much more. As he learned, he realized the many things he’d need to improve on his mill and this increased awareness became a growing burden. So much so that he tabled the project for almost two years.
A Fresh Start: Building on lessons learned
In Edward’s life, SketchUp had been replaced by Autodesk Inventor, so now full 3D prototyping was both possible and powerful. He designed a completely new CNC mill in software. Before cutting even a single piece of wood, he tested the assembly thoroughly in Inventor. When he was confident of his design, he sent the files to Ponoko to be cut. When he received the cut wood, it fit together precisely and assembled perfectly.
When it came to electronics, Arduino and the shields ecosystem were now available to provide controller systems. G-code interpreters such as Grbl made it easy to control CNCs. Together they make it possible to quickly and cheaply build the rest of the mill and put it to the test. With high hopes he ran a test print of the SparkFun logo and he achieve fantastic results!
Open Source CNC Mill Kit
Of all the costs of mill-building, the cost of the rails stood in the way his goal. With cheap enough rails a mill could be built for $300. He looked around and found new sources that might work. He didn’t want to pour his own money into testing these options but decided if he could get the work funded then he’d take the time to do the prototyping.
Enter Kickstarter, the crowdfunding service where he posted his CNC project. If the community would fund his test of three different prototypes then he committed to release the results as open source hardware, providing a build of materials (BoM), and drawing files for free to all. A schedule of awards tied to funding levels was set; top contributors would receive complete CNC mill kits of the selected design. The campaign started on June 28, 2011 and ran for 30 days.
Coincidentally, just as the Shapeoko campaign began on Kickstarter, the MakerSlide campaign ended. Since Edward was looking at rail systems, he was naturally interested and after talking with Bart Dring of MakerSlide, he became a big fan. His mill prototypes started to use MakerSlide, and as its structural properties became better understood, Edward used more and more of it. Below you can see renderings of several prototypes: earlier versions on the left, later versions on the right. Note the last two use MakerSlide exclusively. The end version is the Shapeoko.
The campaign goal had been to raise $1,500 to fund the prototyping. He easily exceeded that and raised a total of over $11,000 with 14 people paying $500 for the CNC kit. Six extra kits had been assembled so Edward offered them for sale to Kickstarter supporters. All six were gone within 15 seconds of sending the offer email and almost 50 people were left wanting. So Edward did what any good businessman would do, he made more.
He made 20 more and sold out in an hour. So he made 30 more… and sold out in an hour. There was obviously demand but only so much time available in Edward’s life to supply kits. With a second baby having recently arrived in his life, Edward needed help. Referencing MakerSlide’s Bart Dring as a role model and Inventable’s Zach Kaplan as a prospective partner, Edward was soon on the path to getting relief. Shapeoko is now available through Inventables who builds kits, does online sales, and performs fulfillment.
Edward is in the process of getting his life back. Without the burden of selling Shapeoko, he can focus on the many ideas he has for Shapeoko add-ons. He wants to design, build, test, and share them with others. He also longs to spend more time in the CNC community forums to help newly excited members learn about CNC. It’s been many months since he could run regularly, ride his mountain bike, or simply watch TV with his wife. Life with his family will soon become more sane… as sane as life gets with two kids under the age of three.
I don’t know for sure, but I bet Brandon would sell you one, if you’re interested. Or, you could try making your own by pouring concrete into a melamine mold box (as in this tutorial from DIY Network) with upside-down saucers glued to the bottom. [Thanks, Brandon!]
Welcome back to Weekend Projects, fun, mostly beginner-friendly electronics projects you can make in a weekend! Throughout the year, every other week, we’ll introduce a new project for those either looking to get started learning electronics or slightly more advanced projects to build upon what you know. For example, last year, we explored circuit bending (Add Volume, Jack), AM/FM radio (Aircraft Band Receiver), and even touched on cybernetics (555 Timer Ball Whacker). Our big hit was the Light Theremin project, which dozens of users built variations of, from touch-sensitive to motor-driving theremins, using breadboards, Snap Circuits, even “Manhattan-style” circuit design.
This year, we’ll begin with Game Show Buttons, a moderately involved circuit that’s easy to build and understand – no soldering required, so all that’s needed is to drop components in place on a 6″ modular IC breadboard. More on this circuit and a video after the jump!
Challenge your friends to rounds of geeky jeopardy with Game Show Buttons, a two-person quiz circuit built using the legendary 555 timer and a Quad 2-input OR gate IC (we recommend the 74HC32). Along with momentary push buttons and corresponding LEDs (and some resistors and capacitors thrown in for good measure), the first player who thinks they know the answer and pushes his or her button will turn the circuit on, locking out the other player.
This circuit is built using an OR logic gate, which as the name implies is true (on) if either input A or input B is true. The OR is one of seven common types of logic gates, the others being AND, NAND, NOR, XOR, XNOR, and NOT (or as most call it, an Inverter). Watch the video below to see the circuit being built and operated. If you build this project or a variation of it, be sure to send us an email with pictures of your build!
Sign up below for the Weekend Projects Newsletter to receive the projects before anybody else does, get tips, see other makers’ builds, and more.
“Aperture” is a large wall made of 130 hexagonal components, each of which contains a circular opening with a moveable iris. As the user covers an iris, it opens up, revealing the light on the other side of the wall. The work as a whole is reminiscent of Danny Rozin’s Wooden Mirror.
In development by multidisciplinary group TheGreenEyl for the past five years, this project is a success in electronics, aesthetics, and user interaction. The makers describe it best:
[via The Creators Project]
Instructables user bwang writes:
Obviously, one should read, understand, and be comfortable with the safety procedures before attempting something like this, but what an awesome tool to have. Using scavenged materials, he estimates the build cost $200. It’s an entry in Instructables ongoing EXTREME! Challenge.
Larry Ogrodnek, creator of the LED NameTag kit, figured out a great way to use an RGB backlight LCD to display temperature data.
This is perfect for someone like me who only needs 5 different temperature increments; really cold, cold, nice, hot, and really hot. Most of these parts and (Larry’s NameTag kit) are available in the Maker Shed.
[via Analog Machines]
International “design and innovation consultancy” IDEO threw a cool-sounding hackathon:
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