This page describes a laser engraving setting published for Acier peint / laqué at 2 mm, tested on a OMTech 60W MOPA Fiber Laser Engraver fitted with a Fibre 60W source (1064 nm fibre, 60 W). It states the exact machine, source, material, thickness and operation of the test; power, speed and number of passes are shown with a Premium pass.
Why those four facts matter: a engraving setting that works on Acier peint / laqué at 2 mm does not transfer to another thickness, nor to another source. A 1064 nm fibre rated 60 W does not deposit the same energy as a stronger module, and the speed has to be adjusted accordingly. Copying a number without checking those four points is the first cause of a ruined part.
Published by LaserSettings (estimation). No other workshop has confirmed it yet: treat it as a starting point, and confirm it from your account if you reproduce it.
No photo comes with this setting yet. If you reproduce it, publish yours from your account: a picture of the result is worth more than a line of numbers.
Recommended routine before running the part: clean the lens, redo the focus, engrave a small test grid on an offcut of the same Acier peint / laqué, then adjust the speed rather than the power. Work with fume extraction and air assist, wear glasses rated for 1064 nm fibre, and never leave the machine unattended.
OMTech offers a broad range of enclosed CO2 machines, fibre markers and galvo models, with many options (honeycomb bed, rotary, chiller). On CO2 units, mirror alignment quality on delivery varies: a setting that gives nothing often starts as an alignment problem, not a power one.
On painted steel the laser works the paint, not the metal: it removes the coating to reveal bright steel underneath. This is the one case where a blue diode gives a crisp result on metal.
The goal is to remove paint without heating the steel: medium power, high speed, single pass. A second pass does not make the line clearer, it widens the area where paint blisters around the design.
Contrast depends on the paint: matt black lacquer gives a very visible mark, pale or metallic paint much less.
A fibre source goes through the paint and then marks the metal: deeper, but less contrasted than a clean diode strip-back.
You do not know what an industrial paint contains: some primers and powders give off frankly toxic fumes. Serious extraction, and avoid painted parts of unknown origin.
The bared steel is no longer protected: on an exposed part it will rust. Clear spray lacquer over the mark solves it.
A dry cloth is enough afterwards: avoid solvents that would attack the paint around the design.