Mahogany is a dense exotic wood, red-brown, with a tight and even grain. It is one of the finest engraving supports: the dark laser contrast on the red tone gives a warmth that plywood cannot imitate. In exchange it is slower to cut than soft woods, and its price means testing on an offcut is mandatory.
Settings: what really matters
When engraving, mahogany needs less power than you would think: its density means the mark is crisp from a shallow engraving. Start around 45% power at 2,600 mm/min with a 20 W diode, and raise the speed if the line digs in instead of darkening.
For cutting, expect two passes from 5 mm with a diode, one with a 40 W CO2 or above. Lowering the speed is almost always better than stacking passes: each extra pass widens the burnt band on the edge, very visible on a red wood.
The tight grain makes mahogany insensitive to soft/hard zone differences, unlike oak: photos and gradients come out well, without the striping the grain would otherwise cause.
Watch out for resin: some boards hold enough of it to leave a sticky film on the lens after a long run. Check the lens after an hour of cutting — a haze alone costs around 20% of usable power.
Common thicknesses and pitfalls
Solid mahogany is mostly found in 3, 5, 8 and 10 mm, plus very thin veneer for marquetry. Beyond 8 mm, diode cutting becomes unreasonable: the edge chars before the beam goes through.
The main pitfall is cost: a ruined board is worth several times a sheet of plywood. Always run a two-centimetre power/speed test grid on an offcut from the same batch before the final piece.
The second pitfall is tone: mahogany naturally darkens with time and light. A piece engraved today will show less contrast in six months. On fine engraving, push the contrast slightly to compensate.
Risks and finishing
Mahogany dust is classed as irritant and a respiratory sensitiser: keep extraction running and clean the bed after the batch rather than with compressed air, which puts everything back in the air.
The wood is dense, so it ignites less readily than balsa, but a mahogany fire is harder to put out: never leave the machine during a multi-pass cut.
For finishing, mahogany only needs 240-grit sanding then a hard oil or wax, which brings the red back out. Avoid gloss varnish over engraving: it fills the recesses and flattens the relief. A slightly damp microfibre cloth removes the soot deposit around engraved edges.
Every figure on LaserSettings comes with the machine, the laser source, the material and the thickness it was tested on. A setting published for a 10 W diode says nothing about a 40 W CO2, and a setting for 3 mm says nothing about 6 mm: check those four things before you copy any number.
Settings are confirmed or disputed by the members who reproduce them, so reliability comes from cross-checking rather than popularity. Photos of the result — cut edges, engraving shades, scorching — tell you more than a single number found on a forum.
Whatever the material, treat a published setting as a starting point: run a small power/speed test grid on an offcut, clean the lens, redo the focus, work with fume extraction and air assist, wear glasses rated for your wavelength and never leave the machine unattended.