https://www.cocoacrumbs.com/categories/cnc/ Recent content in cnc on Cocoacrumbs Hugo -- gohugo.io en Tue, 01 Sep 2020 00:00:00 +0000 https://www.cocoacrumbs.com/blog/2020-09-01-airplay-receiver-with-pi-zero-w-and-elektor-audio-dac/ Tue, 01 Sep 2020 00:00:00 +0000 https://www.cocoacrumbs.com/blog/2020-09-01-airplay-receiver-with-pi-zero-w-and-elektor-audio-dac/ Intro A few years ago, Elektor Magazine had an interesting DAC project with high end aspirations based on the Burr-Brown (now Texas Instruments) 1794 DAC for a modest price. I bought one and although it sounded very good indeed, it never got used very much. Mainly because it was clumsy to use for me (and lacking a proper enclosure). It was slow (maybe it’s better with a Raspberry 4 now), the touch screen is too small for me (and being of the resistive kind instead of capacitive, not very responsive neither). https://www.cocoacrumbs.com/blog/2020-04-20-rotary-volume-control/ Mon, 20 Apr 2020 00:00:00 +0000 https://www.cocoacrumbs.com/blog/2020-04-20-rotary-volume-control/ Intro I’m the lucky owner of a Devialet Expert Pro 250 (which started as the D Premier many moons ago) driving a pair of Martin Logan CLX Art. (Yes, it’s as good as the many raving reviews say. If you have to chance to buy one, don’t hesitate). But what has this to do with this blog post? Well, one of the nice things of the Devialet is its remote control and more specifically, the way they implemented the volume control. https://www.cocoacrumbs.com/blog/2020-03-20-cnc3040-part-4/ Fri, 20 Mar 2020 00:00:00 +0000 https://www.cocoacrumbs.com/blog/2020-03-20-cnc3040-part-4/ A new spindle for the CNC 3040 Another problem I encountered with my cheap CNC 3040 was the cheap spindle. First problem was that it started vibrating (a lot) at certain speeds. Another problem was the higher than expected run out (i.e. rotation inaccuracy which occurs when the tool is no longer aligned with the main axis). The consequence of a higher than expected run out is that the traces you mill away from a PCB are much wider than expected and there will be less copper left (or even none) for the actual PCB track. https://www.cocoacrumbs.com/blog/2020-03-11-cnc3040-part-3/ Wed, 11 Mar 2020 00:00:00 +0000 https://www.cocoacrumbs.com/blog/2020-03-11-cnc3040-part-3/ Milling PCB’s Now that everything is working properly, armed with a fresh set of blank PCB’s and plenty of CNC mills it’s time to try out if machining a PCB is feasible. First test - Loudspeaker filter The PC loudspeakers I build can improved a little with an optional notch LCR filter in case you would find the drivers overly bright sounding. QUCS simulation of the LCR notch filter. The schematic is so simple that I didn’t need a PCB layout application to design the PCB layout. https://www.cocoacrumbs.com/blog/2020-03-01-cnc3040-part-2/ Sun, 08 Mar 2020 00:00:00 +0000 https://www.cocoacrumbs.com/blog/2020-03-01-cnc3040-part-2/ The CNC controller After a lot of searching, and being totally new to CNC milling, I decided to go for a commercial solution and finally settled for this: Mk3/4 controller with enclosure and accessories Although not cheap, this package offered about everything I would need (e.g. the software also included measuring the warp of a PCB and adjust the gcode program accordingly so that the cutting depth is equally deep everywhere). https://www.cocoacrumbs.com/blog/2020-03-01-cnc3040-part-1/ Sun, 01 Mar 2020 00:00:00 +0000 https://www.cocoacrumbs.com/blog/2020-03-01-cnc3040-part-1/ A bit of history - A small series about my CNC adventure. Once I decided to pick up my electronics hobby again (around 2017) I had to think on how to make printed circuit boards (PCB). Breadboards are nice for experimenting but at a certain time it would be nice to have something more permanent on a PCB to build in a nice case. In my youth this was done by either: