What is Reddit's opinion of 10pcs Triangular CNC Router Bits V-Bit, 60 Degree 0.1mm Engraving Bits, 1/8” Shank Nano Blue Coating Sharp Pyramid Bits for Acrylic Wood MDF Aluminum Lettering Sign Making?

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I've been learning the ropes for PCB milling. Every board I've done so far has been usable, but I've been trying to figure out how to avoid the burrs and get good, precise dimensional accuracy.

Today I worked out the right settings for these wonderful 60-degree engraving bits, and got my cleanest result yet. Trace widths and gaps came out spot-on, at least as well as I can tell with my calipers under a magnifier :-).

I use 60-degree pyramidal engraving bits like these for isolation routing. I experimented with other bits, and most engraving bits will work. But these have been very hardy, and given me the most repeatable results. Some people even use little end-mills, but the tiny end-mills break very easily.

I use some 0.8mm end mills for milling holes, but I searched far and wide to find some with a very short vertical length so they are strong enough not to snap easily. I think they are these ones.

IMO, CNC milling makes a lot of sense in a rapid prototyping or experimental situation. For me, I'm trying to learn about RF and analog stuff (been a digital guy my whole life), and this capability has been a godsend. Waiting a week for reasonable cost is a huge delay in making progress :-).

In the milling world, PCBs are not fearsome at all. They are considered almost child's play, since you're just engraving a soft metal. It's not like cutting aluminum or steel or something, so you can get away with a less capable machine.