Friday, October 26, 2012

Successful PCB Milling Experiment

I’ve been learning electronics on and off in the past couple of years and finally decided to try milling a PCB on the Taig CNC Mill.
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“Hand” drawn PCB in Rhino with toolpaths done in MadCam.
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Milling with a .020” carbide end mill.
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Another shot.
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Very clean, no burrs.
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Holes drilled with a #59 carbide circuit board drill.
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Soldered up and working. It’s an Attiny84 microprocessor driving an RGB LED with PWM so I can get a lovely mix of colors. The headers on either side of the chip are for reprogramming and additional utility. I'm using an Arduino to program the Attiny84.

5 comments:

  1. That piece of material doesn't look like it is being held down. is it glued? How'd you get it up and what is the material? Plain copper?

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  2. It's a one sided blank PCB. You can get them from any electronics supplier, radio shack, etc. It's about .002" thick copper bonded to a phenolic board. I used double stick carpet tape to hold it down to a tooling plate.

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  3. Turning tape would also be an alternative if you needed a little more "stick"

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  4. NIck,
    Congtrats!
    Fwiw: Use some super glue half a drop in each corner and center....
    do your milling.... then pour some acetone on it and it'll come right up.
    thats ow I do it it works perfectly. also allows you to deal with those boards that are not perfectly flat too. I should post up some pics of my PCB board jig.

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  5. Good tip, I'm going to build a jig as well soon so it would be great to see yours.

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