If you’ve got a lot of spare parts lying around, you may be able to cobble together your own laser engraver without too much trouble. We’ve already seen small engraver builds that use an Arduino, but [Jeremy] tipped us off to [Xiang Zhai’s] version, which provides an in-depth guide to building one with a Raspberry Pi.
[Xiang] began by opening up two spare DVD writeable drives, salvaging not only their laser diodes but the stepper motors and their accompanying hardware, as well as a handful of small magnets near each diode. To assemble the laser, he sourced an inexpensive laser diode module from eBay and used a vise to push the diode into the head of the housing. With the laser snugly in place and the appropriate connecting wires soldered on, [Xiang] whipped up a laser driver circuit, which the Raspi will later control. [Xiang] worked out the stepper motors’ configuration by following [Groover’s] engraver build-(we featured it a few years back)-attaching the plate that holds the material to be engraved onto one axis and the laser assembly to the other.
Check out [Xiang’s] project blog for details explaining the h-bridge circuits as well as the Python code for the Raspi. As always, if you’re attempting any build involving a laser, please use all necessary precautions! And if you need more information on using DVD burners for their diodes, check out this hack from earlier in the summer
Here is a very time consuming project that I worked on during last summer: an ARM Cortex M4 based platform with plenty of communication interfaces and on-board peripherals. The particular project for which this board has been developed is not really HaD material (one of my father’s funny ideas) so I’ll only describe the platform itself. The microcontroller used in the project is the ATSAM4E16C from Atmel, which has 1Mbyte of flash and 128Kbytes of SRAM. It integrates an Ethernet MAC, a USB 2.0 Full-speed controller, a sophisticated Analog to Digital Converter and a Digital to Analog Converter (among others).
Here is a list of the different components present on the board so you can get a better idea of what the platform can do: a microphone with its amplifier, a capacitive touch sensor, two unipolar stepper motors controllers, two mosfets, a microSD card connector, a Bluetooth to serial bridge, a linear motor controller and finally a battery retainer for backup power. You can have a look at a simple demonstration video I made, embedded after the break. The firmware was made in C and uses the Atmel Software Framework. The project is obviously open hardware (Kicad) and open software.
Continue reading “A cortex M4 based platform with ETH, USB, BT and many on-board peripherals”
[James Dressman] emailed us about his two-year journey of getting a large CNC machine running in his home. He doesn’t currently have a webpage, however his story was so incredible that we just had to feature it. [James] started by doing plenty of research online, and ordering a new CNC. The real fun started when he opened up a wall to fit the 2300 pound monster into his home. [James] found so much insect and water damage that he ended up rebuilding the entire rear half of his home.
Once the CNC was safely set up, the fun still wasn’t over. Not all family members are keen on having an industrial machine tool in the house. In [James’] case it was the smell of way oil that drove his wife nuts. This was all before spindle problems with the tool itself began to rear their ugly head. Illness and family tragedy put everything on hold for several months, however once [James] strength returned, he attacked the problems with renewed vigor. It was a long and winding road, but he now has a fully functional CNC.
But don’t just take our word for it. Continue after the break to see his photo album and to hear James tell the story in his own words.
Continue reading “A Nightmare on CNC Street”
[SilverJimmy] already had a full-sized 50 watt laser cutter, but he decided to try his hand at putting together something smaller and microcontroller-driven. The result is this adorable little engraver: the MicroSlice.
To keep the design simple, [SilverJimmy] opted for a fixed cutting table, which meant moving the cutting head and the X-Axis as a unit along the Y-Axis. The solution was to take inspiration from gantry cranes. He snagged a couple of stepper motors with threaded shafts, designed the parts in Inkscape, then fired up his full-size cutter to carve out the pieces. An Arduino Uno and the relays for the laser and fans sit on the MicroSlice’s bottom platform, and two EasyDriver motor controllers sit above them on the next layer.
Swing by the Instructables for more details including the source code, and to see a video of the engraver below. [SilverJimmy] sourced his laser from eBay, but check out the engraver from earlier this year that used a DVD diode.
Continue reading “Microslice: The Tiny Arduino Laser Cutter”
[Benne] has a small workshop at home so he decided to make a very versatile CNC router for his final project at school. It took him around 6 months to arrive at the result you can see in the image above and what is even more impressive is that he was only 17 years old at the time.
[Benne] used the free cad program Google Sketchup to draw the different parts he needed around the linear rails and ball screws he already had lying around. The CNC’s travel is 730x650x150mm, uses Nema 23 (3Nm) steppers, 15mm thick aluminum plates and 30x60mm aluminum extrusions. In his article, [Benne] gives great advice to those who would like to design their CNC like his, providing very useful links to manufacturers. He estimated the cost of his CNC to be around 1500 euros (about $2000). We’ll let you browse the many lines of his very detailed build log, which makes us wish to be as talented as him even at our age…
[Bart] Wanted to try controlling a CNC with his BeagleBone black, but didn’t want to invest in a CNC Cape. No problem – he created his own translator board for RAMPS. LinuxCNC for the BeagleBone Black has been available for a few months now, and [Bart] wanted to give it a try. He started experimenting with a single stepper motor and driver. By the time he hooked up step, direction, and motor phases, [Bart] knew he needed a better solution.
Several CNC capes are available for the BeagleBone boards, but [Bart] had a RAMPS board just sitting around, waiting for a new project. Most RepRap fans have heard of the RAMPS – or Reprap Arduino Mega Pololu Shield. In fact, we covered them here just a few days ago as part of our 3D Printering series. RAMPS handle all the I/O needed for 3D printing, which carries over quite nicely to other CNC applications as well. The downside is that they’re specifically designed for the Arduino Mega series. Continue reading “BeagleBone Black does CNC with RAMPS”
[Dan Royer] has noticed that most university projects involving a Stewart platform spend more time building a platform than on the project itself. He hopes to build a standard platform universities can use as the basis for other projects.
Stewart platforms are six degree of freedom platforms often seen hefting flight simulators or telescopes. The layout of the actuators allows movements in X,Y,and Z as well as pitch, roll and yaw. While large platforms often use hydraulic systems to accelerate heavy loads quickly. [Dan] is looking at a smaller scale system. His platform is built of laser cut wood and uses six steppers to control motion.
One of the harder parts in designing a platform such as this is creating a mechanical system that is strong, precise, and smooth. With so many linkages, it’s easy to see how binding joints could bring the entire thing to a grinding halt. [Dan] is currently using RC helicopter ball joints, but he’s on the lookout for something even smoother.
Continue reading “Stewart Platform reinvents the wheel so you don’t have to”