Saturday, June 19, 2010

PCB isolation routing - first attempt

Last night I downloaded CADsoft Eagle schematic drawing and PCB design software. Learned just enough to make a basic board. Used an Eagle to Gcode converter and created the gcode.

Tie-wrapped a rollerball pen in place of my router, added a flat (MDF) auxiliary table on the Router base, got the paper flat.

Started the EMC software, opened the gcode file. It looked perfect with a "rats nest" of jogs. I set X and Y to home, set the touchoff, and hit 'go'. Board is about 2.5 by 2.0 inches.

Son-uv-a-gun. It did pretty damn good. I am pretty sure I had some of the feed rates too high, and I think I skipped a step or two. Nevertheless, I was blown away. It takes a L O N G time to route. One key learning: keep as much copper on the PCB as you can!

Here is a close-of the bottom left of the PCB. The holes are marked quite well in the pad centers. This was not the case everywhere, though. Next time, I will slow down the steppers.

This will make prototyping PCBs fun, clean and fast (faster than the chemical options!).

I will document my complete setup and experience.

Here is a 73 second video of the CNC machine drawing with the roller-ball pen. You can see the pen flex and the paper move - these are, no doubt, large contributors to the inaccuracy. video

3 comments:

  1. Thank you so much for taking time to share your great experience and knowledge through video posting..pcb assembly

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  2. Hi I am interested in building your router mount. Do you have any links of pics you could email on how did you build it?

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  3. I designed the mount such that I could quickly (4 bolts, 10 minutes) switch from my 1/4" Craftsman wood router to my high-speed, 1/8" die grinder for doing PCBs. Drop me your email address and I'll send you some photos and drawings.

    WoodWorker B at Gmail dot com

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