Tomaz Solc wrote:
Yes. That CircuitCAM software has a feature called "rubout" that will
completely remove copper where it's not needed. It's a very time
consuming process but people in the lab told me that otherwise it would
be very hard to solder components on both sides without shorting
something (there's no solder mask).
The CircuitCAM software also has some settings to increase the amount of copper
cleared around pads without rubbing out the entire board. (It simply runs the
router around a pad several times with an increasing radius.) This should take
care of most soldering problems. Of course, if you don't want islands of dead
copper on your board, then rubbing out the whole thing is they way to go. You
just use up a lot more router bits that way.
If so, why does it look like the clear areas are a diffferent height than
the trenches next to the copper tracks?
The rubout is done using a wider router (2mm I think). I guess that this
wider router was positioned a bit higher than the router used for
contours (I think the mill they used doesn't have Z-axis positioning).
With the LPKF milling machines I have used, you had to manually adjust the
depth of the cut before milling. It's easy to see how you could end up with a
different depth when different router bits are used.
-Jeff
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