【Laser Engraving】Laser Engraving Woodwork: Everything You Need to Know
In the world of woodworking enthusiasts, there's always more room in the house when new equipment appears!
As home laser cutting machines become more affordable, now is a great time to explore how they can fit into your craft.
How can you enhance the aesthetics of your work or create personalized gifts through laser engraving on wood?
Unlike etching and marking, laser engraving vaporizes and removes some of the material you are customizing.
This leaves a cavity that is more or less deep and dark, depending on your laser cutter settings. You will be able to see and feel it.
But laser engraving is much more than just clicking the "start" button on your laser cutter.
Choosing the wood and preparing it for engraving, designing, engraving methods, and cleaning are all part of the process of creating your piece.
In this article, we will delve into the details of laser engraving on 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 thick and above is a good starting point. But there are other factors to consider for your project!
Color: Most woods engrave darker under a laser cutter, with few exceptions. Lighter woods like birch or pine are generally good all-around choices!
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 that wood fibers and resin will then be deposited wherever they can. If you don't want to clean this up, then wood with a low resin content is a good choice.
Bamboo, commonly used for cutting boards, is a great example. If you're buying wood from a specialized woodworking shop, you can also ask the team for advice or request summer-cut wood with 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 directions are different, harder grain fibers can interfere with your design. So, when preparing your wood, make sure to choose a piece where the grain is horizontal in the laser engraver.
Hardness: To check the hardness of a piece of wood and how easily it can be engraved, you can simply try to make an indentation with your fingernail. If a mark is left 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 less scientific, but it will be very helpful to you!
Wood Preparation
Now that you've picked the perfect piece of wood for your project, it's time for preparation.
This could mean one or more of the following:
Cleaning and Sanding: Your wood is likely unfinished or has an irregular surface, as well as dust and stains from transportation 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 your project.
Using stains, water-based paints, or alcohol markers, you can add a touch of color to your project before engraving to achieve 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, applying tape is the perfect choice; it peels cleanly from the wood.
All these steps will save you work after your laser engraving project is complete.
Design and Engraving
Once the material is ready, the next step is to integrate your project into design software. Do you want to raster engrave detailed images and text, vector engrave intricate design features, or both?
Raster Engraving: It 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 slow!
Vector Engraving: It uses the same settings as laser cutting, adjusted to "kiss cut" the wood.
It's great for engraving very fine details (too much for raster engraving), quickly engraving large surfaces, or increasing the clarity of raster engraving.
When it comes to engraving, wood is a very forgiving material.
However, two types of wood engraving projects are trickier: reproducing grayscale shades when engraving photos, and deep engraving to create different heights (also known as 2.5D or relief engraving).
These two types of projects are usually reserved for advanced users, but advancements in software and tutorials are making them easier every day.
As for 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 can be applied to the laser control software. Some file formats play better than others.
Ordinary 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 your 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, typically the speed, power, and frequency shown in your laser engraver's manual. Then, turn on the exhaust and begin!
Stay Safe
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 to never leave your laser engraver unattended, especially with thinner wood boards or veneers.
Of course, test your settings on a sample before committing to a project.
Using excessive 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 in danger 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 smoothly during preparation and engraving, you won't need to do much to help your design stand out.
First, peel off the applied tape. It easily comes off with any resin 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 choice, but whatever you do, avoid boiled linseed oil!
Added solvents and chemicals can be dangerous, especially for laser-engraved projects that come into contact with food or are around young children.
Finally, clean your laser engraver. Even during one engraving job, the air assist nozzle that keeps dust and smoke away from the beam can quickly get 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 wood for 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, here are some points to consider:
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 space for the laser engraver and the computer to run it. Depending on the equipment you choose, you may also need ventilation space, or to be able to place the machine in a sufficiently large room with 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 start your engraving journey!
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