CNC milling has been around for a while, typically with shop-based machines; we haven't seen a portable one since ShopBot discontinued their Handibot model. But Utah inventor Henry Ashworth built a portable CNC unit that takes a common Makita router, can be set up outdoors, and can engrave in concrete and stone. The engraving can then be filled with resin or painted.
Ashworth launched a business around the machine called Red Art Technologies. He now sells the CNC Pro, as he named it, along with specialty engraving bits. The applications are numerous:
Being portable, the machine can easily be moved and indexed, and has an infinite cutting area.
It can even do walls.
It breaks down to fit in this robust portable case.
See the CNC Pro in action below.
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Comments
I would imagine that covering the area with a self adhesive sheet of paper or plastic before engraving might make painting easier.
This is especially good for safety notices like the one in the seventh pic. Rather than a surface paint application or even raised lettering that can be worn off, inset lettering is protected by the whole surface of the area.
As long as the engraving is filled in properly. A safety notice that is a minor tripping hazard would be a bit odd.