Homebrew_PCBs

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?

Two words.

Brass Brush.

Well tried on the remaining bits of the board I was cleaning up and a brush didn't seem to help at all.   Of course they were the most stubborn of the threads.   I will try the brush right away next time.

Is this a common occurrence?

Copper is notorious for its difficult machining characteristics. It has a tendency to be 'gummy' and 'catch the cutting tool. Careful selection of tool feed and speed go a long way to reduce those tendencies. A very sharp tool helps as well. As mentioned a brass brush to break off the tendrils wirks.

PJH
N7PXY 

At 08:33 PM 09-02-17, you wrote:

>
>
>Two words.
>
>Brass Brush.

Wrong, use another two words: abrasive rubber (eraser with glass
powder inserts).
Specially produced to clean the PCBs.
See Farnell UK #141330 and #4208596, under the name of
ERASER/CLEANER BLOCK.

Cristian