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HowTo: How to make printed circuit boards
( Robert Stark)
Step 20 : Before you mount parts
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| | When drilling holes in fiberglass, the drill bit has a tendency to get dull pretty quick. When this happens, the drill leaves a ridge of copper around the edges of the holes as you drill. Just leave it for now, but when you are ready to clean the P-n-P off so you can mount parts, this little ridge will chew the snot out of your steel wool. To remedy this situation, use an electric sander (or hand sand it) with 180 grit paper. Don't scour the surface of the board, just run the sander over it lightly to remove the copper ridges from the holes, THEN use your steel wool to clean the board. Be sure to use the steel wool. If you try to solder on the board after it is sanded only, the solder won't flow very well and you'll wind up with lots of cold solder joints.
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