Laser Engraver Settings for Wood, Acrylic, Leather & Coated Metal
This guide gives you starting laser engraver settings for wood, acrylic, leather, and coated metal, with the exact power, speed, and frequency values to try first. You enter your material type and thickness, and you get a baseline setting that you then fine-tune with a test grid on a scrap piece. These are starting points, not universal constants, because every laser tube, lens, and material batch behaves slightly differently.
How Laser Engraving Works
A laser engraver focuses a high-energy beam onto a material’s surface. The beam either vaporizes the top layer (engraving), melts it into a mark (some plastics and metals), or burns it away to create depth (wood and leather). The three key variables are:
- Power – the percentage of maximum laser output. Higher power cuts deeper and darker.
- Speed – how fast the laser head moves. Slower speed means more energy per spot, so a deeper/darker mark.
- Frequency (PPI/Hz) – the pulse rate. Higher frequency gives a smoother, more continuous line; lower frequency creates a dotted or textured effect.
Most consumer and hobby lasers (CO2 and diode) use these same three parameters. The material’s response to heat determines the ideal combination.
Wood Settings
Wood is the most forgiving material. It engraves by burning, so the goal is a consistent, dark mark without charring the edges. Start with these values for a 40W CO2 laser:
- Power: 20–40%
- Speed: 300–500 mm/s
- Frequency: 500–1000 Hz
For harder woods like oak or maple, increase power slightly or reduce speed. Softwoods like pine absorb more heat and scorch easily, so start at the lower power end. A common mistake is using too much power, which produces a fuzzy, over-burned edge. Always test on a scrap piece first.
Acrylic Settings
Acrylic comes in two types: cast and extruded. Cast acrylic engraves to a frosty white finish, while extruded acrylic tends to melt and re-solidify into a clear, raised edge. For cast acrylic, use:
- Power: 15–25%
- Speed: 400–600 mm/s
- Frequency: 1000–5000 Hz (higher gives a smoother white)
Extruded acrylic needs lower power and higher speed to minimize melting. If you see a gooey edge, reduce power or increase speed. Also, always remove the protective film before engraving, and ensure good ventilation – acrylic fumes are irritating.
Leather Settings
Leather engraves by burning the surface, creating a tan-to-dark brown mark. Natural leather (not synthetic) is best. For a 40W CO2 laser:
- Power: 15–25%
- Speed: 300–500 mm/s
- Frequency: 500–1000 Hz
Higher power can cut through thin leather, so start low. The texture of the leather affects the result – smooth leather gives a crisp mark, while rough or suede leather absorbs heat unevenly. Also, be aware that some leathers contain chromium, which can produce toxic fumes when lasered. Use a fume extractor and work in a ventilated area.
Coated Metal Settings
Coated metal (like anodized aluminum or powder-coated steel) is engraved by removing the coating, revealing the bare metal underneath. This requires less power than you might think, because you don’t want to melt the metal itself. For a 40W CO2 laser:
- Power: 30–50%
- Speed: 200–400 mm/s
- Frequency: 500–1000 Hz
For anodized aluminum, a common trick is to use a higher frequency (1000–5000 Hz) to get a clean, white mark. For powder-coated steel, lower frequency gives a more visible contrast. If the mark is not bright enough, increase power, but if the metal starts to discolor or warp, reduce power and speed.
How to Fine-Tune Your Settings
No single setting works for every machine. To dial in your own, run a test grid on a scrap piece of the same material. Create a grid where each cell has a different combination of power and speed. For example, vary power from 10% to 50% in 5% steps, and speed from 200 to 600 mm/s in 50 mm/s steps. Engrave a small shape (like a square) in each cell, then inspect the results:
- If the mark is too light, increase power or decrease speed.
- If the edges are charred or melted, decrease power or increase speed.
- If the mark is uneven, adjust focus or try a different frequency.
Keep notes on what works. Over time, you’ll build a reference for your specific machine.
Common Problems and Fixes
Here are the most frequent issues and their likely causes:
- Light or faint mark: Power too low, speed too high, or lens out of focus.
- Charred edges: Power too high or speed too slow, especially on wood and leather.
- Melted plastic: Speed too slow or frequency too low on acrylic.
- Metal mark won’t show: Coating too thick or power too low; try increasing power gradually.
- Uneven depth: Material not flat, or focus not set correctly.
Safety and Ventilation
Laser engraving produces fumes, smoke, and fine particles. Always use a laser engraver with an exhaust system or fume extractor, and never operate it in an unventilated room. Some materials are dangerous to laser – PVC, vinyl, and other chlorinated plastics release toxic chlorine gas. Avoid lasering any material that isn’t specifically designed for laser use. Always wear appropriate eye protection that matches your laser’s wavelength, and never leave the machine running unattended.
Frequently Asked Questions
What is the best frequency for engraving wood?
For wood, a frequency of 500–1000 Hz works well. Lower frequencies (around 500 Hz) give a slightly more textured burn, while higher frequencies (1000+ Hz) produce a smoother, more uniform dark mark. If you see a dotted line instead of a solid one, increase the frequency.
Can I use the same settings for cutting and engraving?
No. Cutting requires much higher power and slower speed to blow through the material. Engraving is a surface process. Using cutting settings for engraving will ruin the piece, and engraving settings for cutting will not cut through. Always set the mode (engrave vs. cut) and use the corresponding parameters.
Why does my acrylic engrave clear instead of white?
You are likely using extruded acrylic, which melts and re-solidifies clear. For a frosty white engraving, use cast acrylic. If you must use extruded, try increasing the frequency and reducing power to minimize melting.
How do I engrave on dark leather?
Dark leather may not show a contrast mark because the burn is darker than the material. You can use a higher power to create a deeper, darker burn, but test first. Alternatively, use a lower power to create a subtle texture that reflects light differently.
What is the best way to engrave coated metal without damaging it?
Start with low power (around 30%) and moderate speed (300 mm/s), then increase power in 5% increments until the coating is removed cleanly. Avoid high power that could warp the metal. Using a higher frequency (1000+ Hz) often gives a cleaner removal.
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