I have a mill which I converted to CNC several years ago...=20
http://orlandorobotbuilders.com/stuff/cnc_mill_02.jpg
I mostly use it for aluminum, lexan and some HDPE.

Though I don't mill PCB's with it (mostly because I generally need 6-mil=20
trace/space and still don't have a simple/easy solution to adding vias,=20
I have used it to depanelize PCBs from a large panel.

I'm not sure about FR-1, but FR-4 will consume carbide bits quickly if=20
not cooled.  For this I use a shop vac to draw cold air over the bit.  I=20
really just hold it next to the bit as it moves around. This works=20
really well, especially becausse it keeps harmful FR-4 dust under=20
control.  You DON'T want to inhale that stuff.

There's a website that sells D-bits for routing PCBs, but I can't=20
remember the name offhand.  They had a lot of info on how to select=20
bits, generate PCB-milling files from Eagle, etc.  I'll come back to me.
In the meanwhile though, inventables has this kit...=20
https://www.inventables.com/technologies/pcb-milling-bits

Cheers,
-Neil.



On 5/26/2016 3:21 PM, V G wrote:
> Hi all, haven't posted in a while. I've gotten some free time and so
> getting back into the EE hobby. I just bought a 6040 CNC:
> http://www.omiocnc.com/x6-1500gt/ (well, a slightly cheaper clone of it).
> The resolution on this thing is supposed to be excellent. Can't wait to
> start routing some PCBs.
>
> - Anyone have any starting advice?
> - Anyone know of a good source for FR-1 copper boards? I have some FR-4,
> but I don't want to create fiberglass dust.
> - What are some good bit sizes to get for routing small surface mount
> component pads?

--=20
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