When customers ask us for the "correct CO2 laser settings" for wood, leather, or acrylic, the first thing we usually explain is that there is no single setting that works for every material.
A setting that gives a clean engraving on one piece of plywood may produce a darker result on another. Leather can change considerably depending on how it has been treated, while acrylic behaves differently depending on whether it is cast or extruded.
So when we set up a CO2 laser engraving machine, we normally start with the actual material rather than taking a number directly from a parameter chart.
Wood, leather, and acrylic are all common CO2 laser applications, but the way we approach each one is quite different.
Wood: surface condition matters
Wood is relatively easy to start testing, but it can also be inconsistent.
Plywood is a good example. Two sheets may both be sold as 3 mm plywood, but the veneer, glue, wood species, and surface finish can all affect the engraving result.
For a simple logo or text, we normally begin with moderate power and a relatively higher speed. If the engraving is too light, the energy can then be increased gradually.
If the surface starts becoming very dark or the edges show excessive burning, adding more power is usually not the first adjustment we make.
Reducing the energy delivered to the surface can produce a cleaner result. Depending on the application, increasing the speed or reducing the power may be enough.
When a customer wants a deeper engraving rather than a dark surface mark, multiple passes can sometimes provide better control than one slow and aggressive pass.
The best setting therefore depends not only on the thickness of the wood, but also on what kind of appearance the customer actually wants.
Leather needs a little more caution
Leather can be less predictable than wood.
Natural leather, vegetable-tanned leather, finished leather, and synthetic leather may all react differently when exposed to a CO2 laser.
Before setting parameters, we prefer to know what type of leather is being processed.
For products such as belts, wallets, saddles, and leather accessories, the objective is often a controlled change in color or texture rather than a deep engraving.
A parameter that creates a strong dark mark may look good on one product but be too aggressive on another.
This is where a small sample test becomes useful.
There is also an important material-safety issue with synthetic leather. Some artificial leather products contain plastics or coatings that are not suitable for laser processing and may release hazardous fumes when heated.
If the material composition is unclear, it should be checked before testing. This is not something that can be solved by adjusting laser power.
Acrylic has a different response
Acrylic is another common material for CO2 laser engraving, but it should not be treated like wood.
Cast acrylic and extruded acrylic can produce different engraving effects.
With suitable acrylic, a CO2 laser can create a clean, frosted-looking engraving. If too much energy is applied, the engraving may become unnecessarily deep or the surrounding area may be affected.
For thin acrylic, heat accumulation can become noticeable. Depending on the required depth and appearance, several lighter passes may sometimes provide better control than one heavy pass.
Transparent acrylic also creates a practical positioning problem.
The material itself can be difficult to see clearly against the working surface, especially when several pieces need to be processed in exactly the same position.
A simple fixture or positioning guide can therefore be just as useful as changing the laser parameters.
There is no universal CO2 laser setting
We are sometimes asked for a simple answer:
"What power and speed should I use for wood?"
The problem is that laser power and speed cannot be separated from the machine configuration.
The result can be affected by the laser tube power, lens, focal length, material thickness, surface condition, air assist, exhaust system, and the material itself.
A setting that works on a 60W machine is not automatically suitable for a 100W machine.
Even changing the optical setup can affect the engraving result.
For this reason, published parameters should be treated as a starting point rather than a production recipe.
We normally start with a small test
When a customer sends us a new material, one of the most useful things we can do is make a small test grid.
Rather than changing everything at the same time, we vary power and speed while keeping the other conditions relatively stable.
The result quickly shows where the material begins to engrave clearly and where excessive burning, melting, or surface damage starts to appear.
With wood, we are usually looking for the balance between sufficient contrast and excessive charring.
With leather, the appearance of the surface becomes more important.
With acrylic, we pay closer attention to engraving clarity, frosting, depth, and whether heat is affecting the surrounding area.
Once we find a suitable range, we can fine-tune the focus and other settings.
This is usually more reliable than trying several unrelated parameters one after another.
Focus is easy to overlook
A CO2 laser can still engrave when the focal position is not correct.
That does not mean the engraving will be sharp.
Small text, fine lines, and detailed logos are particularly sensitive to focus. If the focal position is slightly off, the edges can become wider and less defined.
This becomes more noticeable when engraving small lettering or detailed graphics.
For production work, we recommend treating focus as part of the process rather than something that only needs to be checked when the machine is first installed.
If the material thickness changes significantly, the focal position should also be checked.
Air assist and exhaust are part of the process
Laser parameters are not limited to power and speed.
When engraving wood, air assist can help reduce smoke and debris around the engraving area.
However, maximum airflow is not automatically the best setting for every application. The effect on the surface should be checked during testing.
Exhaust is also important.
Wood, leather, and acrylic can all produce smoke or vapors during laser processing. Proper extraction helps keep the working area cleaner and prevents residue from building up inside the machine.
Keeping the optics and working area clean also becomes increasingly important when the machine is used continuously.
A good sample is not the same as a stable production process
This is one of the differences between testing and production.
A customer may find one setting that produces an excellent engraving on a single piece.
The next question is whether the same result can be repeated on the next fifty or five hundred pieces.
If a workshop processes the same plywood every day, keeping one tested setting may be enough.
For businesses working with different materials, it is more practical to keep simple records for each material type and thickness.
The information does not need to be complicated. Material, thickness, lens, power, speed, and the final result are usually enough to provide a useful starting point for the next job.
Start with the material, then adjust the laser
For wood, leather, and acrylic engraving, there is rarely a reason to search for one "perfect" CO2 laser setting.
The more practical approach is to establish a suitable working range through testing and then adjust it according to the actual production requirement.
At HBS, when we evaluate a CO2 laser engraving machine for a customer, we prefer to look at the actual sample, the required finish, and the production process before recommending parameters.
A clean engraving is not simply the result of using more laser power.
It comes from putting the right amount of energy into the right material, at the right focus and speed, and then being able to repeat that result consistently in production.
