【Laser Engraving】Laser Engraving Woodwork: Everything You Need to Know
In the world of woodworking enthusiasts, there's always room for more tools at home when new equipment comes along!
Home laser cutters are becoming increasingly affordable, so now is a good time to explore how they might fit into your setup.
How can you enhance the beauty of your work or create personalized gifts by laser engraving on wood?
Unlike etching and marking, laser engraving vaporizes and removes some of the material you are customizing.
This leaves a cavity, which can be more or less deep and dark depending on your laser cutter settings. You will be able to see it and touch it.
But laser engraving involves much more than just hitting the "start" button on your laser cutter.
Selecting the wood and preparing it for engraving, designing, engraving methods, and cleaning are all part of creating your piece.
In this article, we will go into detail about the intricacies of laser engraving wood.
Choosing the Right Wood
It all starts with finding the perfect piece of wood! The width and length will depend on what your laser engraver can accommodate.
Anything 1/8 inch and above in thickness works well to get you started. But there are other things to consider for your work!
Color: Most woods will engrave darker under a laser cutter, with only a few exceptions. Lighter woods like birch or pine are generally a good all-around choice!
If you're looking for a deeper or more subtle look, try walnut or cedar.
Resin Content: As we saw earlier, laser engraving vaporizes material to "burn in" your design.
This means wood fibers and resin will subsequently deposit wherever they can. If you don't want to clean this up, then woods with low resin content are a good choice.
Bamboo, often used for cutting boards, is a good example. If you are buying wood from a specialized woodworking shop, you can also ask the team for advice or request summer-cut wood, which has less sap.
Grain: Some laser engraving techniques work better if the wood grain (the direction of the fibers that make up the wood) is in the same direction as the design you are engraving.
If the two directions are different, harder grain fibers will interfere with your design. So, when preparing your wood, make sure to choose a piece where the grain runs horizontally in the laser engraver.
Hardness: To check the hardness of a piece of wood and how easy it will be to engrave, simply try to dig into it with your fingernail. If you can leave a mark without much pressure, then it will be equally easy to engrave.
If not, you may need multiple passes to achieve the same depth and contrast as with softer woods. This test is certainly not scientific, but it will be very helpful to you!
Wood Preparation
Now that you've chosen the perfect piece of wood for your project, it's time to prepare it.
This may mean one or more of the following:
Cleaning and Sanding: Your wood is likely unfinished or has an uneven surface, as well as dust and stains from transport and storage.
Cleaning with a microfiber towel and light sanding is crucial for creating a beautiful, uniform engraved design.
Staining and Coloring: Laser engraving has limited capabilities in terms of color, but there's a simple way to add a pop to the project.
Using stains, water-based paints, or alcohol markers, you can add a touch of color to your project before engraving for the best of both worlds.
You can even contrast your design in different ways after engraving.
Applying Tape: Protecting the wood from the heat, dust, and resin released by the laser helps prevent burn marks. For this, application tape is perfect; it peels cleanly from the wood.
All these steps will save you work after your laser engraving project is done.
Design and Engraving
Once the material is prepared, the next step is to integrate your project into design software. Are you raster engraving detailed images and text, vector engraving intricate design features, or both?
Raster Engraving: This works very similarly to a paper printer, engraving your design line by line vertically, but always from left to right. It's great for images, text, and logos, but it's also very slow!
Vector Engraving: This uses the same settings as laser cutting, adjusted for a kiss cut on the wood.
It's great for engraving very thin details (too much for raster engraving), quickly engraving large surfaces, or adding clarity to raster engravings.
When it comes to engraving, wood is a very forgiving material.
However, two types of wood engraving projects are trickier: reproducing shades of gray when engraving photos and deep engraving to create different heights (also known as 2.5D or relief engraving).
Both categories of projects are usually reserved for advanced users, but advancements in software and tutorials are making them a little easier every day.
In terms of software options, Inkscape is an excellent free design software. Other vector design programs like Adobe Illustrator or Corel Draw are also popular choices.
Once your design is ready, it's time to apply it to the laser control software. Some file formats play better than others.
Plain SVG files and EMF files have a good chance of maintaining the proportions of vector designs.
Some raster engraving jobs require formats with a lot of detail (like BMP images) or formats with transparency (like PNG images).
You will load the file into the laser control software, and the design features will be converted into raster and vector engravings.
Once you are satisfied with how the laser control software interprets your design, select the settings for each process, usually the speed, power, and frequency indicated in your laser engraver's manual. Then, turn on the exhaust and get started!
Safety First
It's important to remember that wood can catch fire! Laser engraving injects a lot of energy and heat into the material. Therefore, make sure never to leave your laser engraver unattended, especially for thinner boards or veneers.
And of course, test your settings on a sample before committing to the project.
Using too much power on a thin piece of wood or engraving at a very slow speed are both possibilities for causing a fire, which not only puts yourself at risk but also damages your laser engraver.
Post-Processing
Just like 3D printing, you can stop once your laser engraving job is done, or you can go the extra mile.
This extra effort is called post-processing, and if everything went well during preparation and engraving, you won't need to do much to help your design stand out.
First, peel off the application tape. It will easily come off with any resin that has deposited on the wood during engraving.
Next, clean the engraving with mineral oil and a microfiber towel. It will remove dust from the engraver and make the wood grain stand out.
Linseed oil is another popular option, but whatever you do, avoid boiled linseed oil!
Added solvents and chemicals can be hazardous, especially for laser-engraved items that come into contact with food or young children.
Finally, clean your laser engraver. Even during a single engraving job, the air assist nozzle that keeps dust and smoke away from the beam can quickly become clogged with dust and resin.
This often happens with resin-rich woods like pine or fir, and materials like MDF or cheaper plywood.
After all this, you should be left with a beautiful engraving on a nice piece of wood. Congratulations, your wood laser engraving project is complete!
Choosing a Laser Engraver
Now that you know how to prepare for wood laser engraving, successfully engrave your project, and clean it up, you might be interested in purchasing a laser engraver or laser cutter.
The good news is, now is the best time.
Before choosing a laser engraver, you should consider the following:
What do you want to do with it? If you have clear project ideas in mind, choosing a machine will be easier.
Do you only need an engraver to decorate parts cut with other tools, or do you also need a laser cutter to cut parts? How much space do you have for it?
You need to provide space for the laser engraver and the computer that runs it. Depending on the equipment you choose, you may also need ventilated space, or be able to place the machine in a room with enough space and a window that can be opened.
What software does it work with? You need to keep compatibility in mind, as not all laser cutters and engravers are compatible with all software.
What is your budget? In the world of laser cutters, price often goes hand in hand with power. But laser engraving is not a high-power application, so laser engravers are relatively inexpensive compared to full-power laser cutters.
Alternatively, you can contact us, and we can recommend the most suitable model for you based on your needs, so you can begin your engraving journey!
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