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Milling PCBs: Leaving behind "threads" of copper

2017-02-09 by me@...

I am milling PCBs.   I am using Flatcam to produce the gcode and autoleveller to "level" the code.    Over all it does a great job.  But I am noticing what looks like "threads" of copper in between the traces.  Typically the "threads" hug the traces.   I can remove them easy enough with a scribe but the process can be tedious.

I am using a 30deg etching bit .1mm.  I set flatcam so it overlaps 22% and I am cutting 3 bit widths. 

Any one else milling and have seen this problem?


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