When you go to a trade show of any kind, you’re expecting cool demos in the booths. At Maker Faire, there were plenty, but one of the most hypnotic was a robot built around Synthetos’ TinyG motion controller.
The demo was simply a large CNC gantry moving a ball bearing around on a string. The gantry moved in the X and Y axes, and the miniature wrecking ball was spooled and unspooled in the Z axis. The ball move around the space, coming to a complete stop without any swaying. There were even a few clear plastic tubes that the ball fell in, and popped out of without raising or lowering the string. It’s the height of motion controller coolness, all made possible with the TinyG.
The TinyG was one of a few motion control and CNC boards found at the faire. In its base configuration, it has 6 axes of motion control, RS485 to network several boards for crazy machine configurations, and a suitably powerful processor to do everything correctly.
The BeagleBone Black, with an impressive amount of computing power and a whole bunch of I/O, would make an impressive CNC controller, save for two shortcomings: The BBB isn’t in stock anywhere, and CNC capes are a little on the pricey side. [Marc Peltier] can’t do anything about finding a distributor that doesn’t have the BeagleBone on backorder for you, but he did come up with an adapter for the very popular RAMPS-FD 3D printer controller board (Forum, French, Here’s the Google translation matrix).
The RAMPS-FD is an extension of the RAMPS board and a shield for the Arduino Due. Both the Due and BBB work on 3.3 V, meaning controlling the RAMPS-FD is simply a matter of finding the correct wiring diagram and pin assignments on the BeagleBone. [Marc] solved this problem by using the settings from the BeBoPr cape and using the existing BeBoPr LinuxCNC configuration.
The end result of [Marc]’s tinkering is something a lot like [Charles Steinkueler]’s CNC capes for the BeagleBone Black we saw at the Midwest RepRap Fest. [Charles] isn’t selling his capes, but no one else seems to be selling BeagleBone Blacks, either.
Continue reading “BeagleBone Black + RAMPS”
[Mike Douglas] has a small hobby CNC router, which works great — but you’re limited to controlling it from your PC. And unfortunately, there just aren’t pendants made for this consumer level stuff. Annoyed at having to reach over to use his keyboard all the time, he stumbled upon a simple, but brilliant solution: A dedicated USB 10-key pendant keypad.
These USB keypads are designed for laptops that don’t have full size keyboards. They can be had for a few dollars from China, and let you expand your keyboard possibilities… All [Mike] had to do was print off some stickers to put on the keys!
It’s easy to program new hot keys in Mach3 — and there you go! Why haven’t we thought of this before? While you’re at it, why not build a cyclonic dust separator for your CNC too — and if you’re having trouble clamping down work pieces, [Mike] has a pretty cool solution for that as well.
DAGU hopes to change that by providing a huge 240×128 LCD display, a bunch of buttons, and an SD card slot for loading G Code directly from an SD card. This is a fully functional controller, able to deliver 3.5 A to each stepper motor winding.
Right now DAGU is in the prototype stage, but already there are some really interesting features: the interface allows for a basic preview of the job before it begins, and should be somewhat affordable. At least as cheap as using an old computer for CNC control, anyway.
Video demo of the use and operation of DAGU below.
Continue reading “DAGU: The Standalone CNC Controller”