https://www.youtube.com/watch?v=AkziYG-Rq2U

Looks like he's doing pretty well with a modified 3018 CNC, even though
not using anything to blow the chips away.

"I don't know what type of aluminum it was"

Somewhere in Pakistan.

Whatever type, it looks like one big chunk of aluminum.





I wrote:

I'm not very hopeful in getting a cheap 3018 CNC to cut aluminum well,
but... I'm not concerned about how long making cuts takes, so that
should help. On YouTube, a few are successful, but many are
disappointed. From the looks of it, I can guess they have no idea what
type of aluminum they are cutting on. One can expect using a high-speed
bit in buttery hardware store aluminum will produce bad results. But
they don't know that. They think they're just cutting on metal.

Someone mentioned an idea that had occurred to me and sounds plausible.
That is, using a cheap CNC for marking drill holes (like a mechanized
center punch).

Also, seems there is confusion about cut smoothly. One pours water in
the cutting bit area. Others use oil. More sophisticated appears to be
mounting a blower nozzle on the motor to blow away the chips (instead of
the cutting area being full of a sludge of chips in water or oil). I
suppose best might be both, I think one guy has oil and air blowing on
the cutting path, but that probably won't happen here.