[David Taylor] needed a CNC router to do some more complex projects — so he did what any maker would do if they’re strapped for cash — make it from scratch!
The impressive part of this build is that it was built entirely in his workshop, using tools he already had. A chop saw, wood lathe, drill and a drill press, and finally a table saw — nothing fancy, but now with the CNC router he has a world of possibilities for projects! The mechanical parts he had to buy cost around $600, which isn’t too bad considering the size of the router. He lucked out though and managed to get the Y-axis and Z-axis track and carriages as free samples — hooray for company handouts!
The router is using an old computer loaded with LinuxCNC which is a great (and free!) software for use with CNC machines. It’s driving a cheap Chinese TB6560 motor controller which does the trick, though [David] wishes he went for something a bit better.
Some examples of the projects he’s already made using this baby include an awesome guitar amp, a wooden Mini-ATX computer case, and even a rather sleek wooden stereo with amp!
Did we mention it can even cut non-ferrous materials?
The current crop of 3D printers are technically four-axis machines, with three axes of movement and a fourth for the position of the filament. [Bas] had an entirely different idea – why not link the speed of the extruder to the speed of the nozzle? It turns out this technique gives you more ‘plasticy-looking’ prints and a vast reduction in blobbiness.
[Baz] has been working with LinuxCNC, a BeagleBone Black and the BeBoPr-Bridge cape, and there’s been a lot of development with that system in turning many straight lines into one smooth arc. This led him to adjusting the flow rate of a nozzle while the printer is running, but this is difficult if the extrusion is controlled by position as in a traditional printer setup. A new configuration was in order.
What [Baz] ended up with is a config that calculated the speed of the extruder based on the speed the nozzle is moving over the print surface. This gave him the ability to add live nozzle pressure adjustment, and as a result, a near complete disappearance of the little blobs that appear at the start of each layer.
For a well calibrated machine, it’s only a small difference between the ‘normal’ and ‘velocity’ methods of controlling an extrusion rate. It’s a noticeable difference, though, and one that vastly improves the visual quality of a print.
[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”