I'd like to know if anyone knows of an etching power supply or a circuit that could be built, for etching (or burning) incremental lines in steel (and possibly other metals).
I would suppose that lines would be less distinct than those done with a laser. I'm guessing that a circuit for etching would be similar to the EDM process. I don't have any idea what can be accomplished in air (or with a shielding gas), or what type of electrode would be appropriate.
I've seen numerous electrical freehand pencil type etchers/markers over the years, but haven't ever used one, and haven't seen how they work. I've seen marked parts, and the writing appears to be permanent, although it doesn't appear to have much depth, and the lines are very thin. The lettering seems to be a result of arcing between the stylus and the workpiece.
I'm primarily interested in etching lines in dials or scales. I'd like to be able to create clearly visible lines on bright steel, or bright lines showing on (etched through) black oxide surfaces.
Any recommendations or sources of info are appreciated, thanks in advance