View Full Version : Mini-CNC
Demon
- 23rd January 2024, 21:04
I bought a Vevor mini-CNC last year . Had a few boo-boos, but Vevor made it right at no cost to me.
https://www.vevor.ca/wood-engraving-machine-c_11142/cnc-3018-pro-cnc-3018-3-axis-10000-rpm-grbl-control-cnc-machine-plastic-wood-p_010386974707
I never thought I could make a PCB with 0.5mm traces using el-cheapo bits on a $200CAD machine.
https://i.imgur.com/fEythwo.png
(this is the bottom side, double-sided circuit is flipped vertically)
https://i.imgur.com/udS2ibP.jpg
I made 2 mistakes; error in the footprint for a slide potentiometer, and forgot a command for 2 oval holes when I editted the files from FlatCAM (I have to separate the drill and mill sizes - I don't have an automated tool changer).
But still, I'm impressed that we can now make at home such a delicate trace.
Demon
- 23rd January 2024, 21:14
Mapping the height of the PCB surface.
https://youtu.be/z429kVs-PPc?si=ubQ2IbAFDHnqycXI
Demon
- 23rd January 2024, 21:16
Drilling an oval hole has never been easier.
I think this was a 1mm mill bit. I mill only 0.1mm deep at a time to save the bit.
https://youtu.be/QYoIV0x4Y-0?si=H0WtdoUZoUVaPAXl
Ioannis
- 1st February 2024, 13:50
As I do not have a CNC machine, nor I like chemicals anymore, I prefer JLC for my pcbs, mainly because they offer DDP or Europacket shipping. This helps pass customs wiht no worries.
I just received my 5 test boards and found a tragic and embarrasing mistake in the power supply connection of the 12F675 chip. Reversed them. Cannot believe that stupid mistake I did...
Rule number 1: Never work late at night!
Rule number 2: Double check next day of the design, before sending to production!
Other than the terrible mistake, they look great. Better than the image here.
9578
Ioannis
Demon
- 1st February 2024, 14:19
- Did you have a lot made?
- Is cutting the trace and adding a jumper an option?
- are these for resale or personal use?
9579
This board was to test custom drill footprints, different solder temps, and various solder paste and flux products.
I only share here a fragment of the boo-boos I've made. :D I don't mind serving as an example of "don't do this". :)
Ioannis
- 1st February 2024, 16:07
Yes, I' ll do that. Cut two traces and wire jump one, short the other.
Fortunatelly, only 5 pcs were made as they are the prototypes. Corrected for the production now.
But I wonder how such a stupid mistake was done... I have an explanation. It was very late when finished and sent over to production.
Ioannis
Demon
- 2nd February 2024, 22:17
Drilling and milling PCBs is awesome. It takes a bit of time to draw the test circuit on Kicad, import into FlatCam and generate g-code, import separate files into Candle, change the bits, align the Z axis.
But this is waaaay more precise than a hand-held dremel, or even mounted on a vertical press. The only thing with the dremel is that it's much quicker setup, and you can tape a sheet of paper over the PCB with all the holes.
It's a great way to test custom footprints before sending them out. Some specs ask for a huge hole. My components will be hand installed; I don't need such a huge margin.
9585
9586
I didn't even bother passing a steel wool to remove the burrs on the holes.
Ioannis
- 3rd February 2024, 10:35
Oh man! That's awesome!!!
Ioannis
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