Air assist is one of the most practical features in laser cutting and engraving. It helps remove smoke, cool the material surface, protect the optical path, and improve the final processing quality. On Thunder Laser machines with dual air assist, users can switch between high airflow for cutting and lower airflow for engraving by controlling the air assist setting in the software layer.

This guide explains how the dual air assist system works, how the Cut and Engrave modes are controlled, how to use the feature in RDWorks and LightBurn, and when adding a high-pressure air compressor may be helpful.

1. What Is Dual Air Assist?

Dual air assist provides two airflow modes for different laser processes: Cut and Engrave. The two air solenoids are controlled by the smart board, while two needle valves on the front left panel allow users to adjust the airflow level for each mode.

The system also includes momentary push buttons for testing airflow. When a test button is pressed, the corresponding air stage activates for 10 seconds, making it easier to check and fine-tune the flow before starting a job.

2. How Cut and Engrave Air Assist Modes Work

2.1 Cut Mode: Higher Airflow for Cleaner Edges

Cut mode is designed for stronger airflow. When cutting, higher air pressure helps remove smoke and debris from the kerf, reduce charring, and improve edge quality. For many cutting jobs, especially on thicker materials, stronger airflow can also help the laser process more efficiently.

2.2 Engrave Mode: Lower Airflow for Better Detail

Engrave mode uses lower airflow. During engraving, the goal is to clear smoke and fine particles without blowing too strongly across the material surface. Excessive airflow can affect fine details or disturb the engraved pattern, so a stable, gentle airflow is usually more suitable for detailed engraving.

3. How to Set Air Assist in RDWorks and LightBurn

3.1 Setting Air Assist in Thunder Laser RDWorks

In the Thunder Laser version of RDWorks, each layer can use the air assist setting to choose the proper air stage. The drop-down setting offers ON and OFF options for cutting and engraving workflows.

• Air assist OFF: Activates the Engrave stage with lower airflow.
• Air assist ON: Activates the Cut stage with higher airflow.

3.2 Setting Air Assist in LightBurn

The same logic also works in LightBurn. For engraving, turn air assist off in the cut settings. For cutting, turn air assist on, and the machine will select the Cut air stage.

4. Why Air Assist Matters in Laser Cutting and Engraving

• Enhances cutting quality: Air assist removes smoke during cutting, helping prevent residue buildup around the cut edge and supporting cleaner, more precise lines.
• Improves cutting efficiency: Higher-pressure air can help support faster cutting on suitable materials and may make it easier to process thicker stock.
• Improves engraving clarity: A steady, moderate airflow clears smoke and fine particles from the material surface, helping preserve fine engraving details.
• Cools the material surface: Laser cutting and engraving generate heat. Air assist provides localized cooling and helps reduce the risk of overheating, especially when cutting acrylic or thick wood.
• Protects lenses and optical components: Airflow helps prevent smoke and debris from entering the laser head area, reducing contamination and supporting easier maintenance.

5. Should You Add a High-Pressure Air Compressor?

If your work involves frequent laser cutting, adding a high-pressure air compressor may be worthwhile. Stronger airflow can help create cleaner cut edges, reduce smoke buildup, and improve cutting performance on suitable materials.

If your work is mainly engraving, a high-pressure compressor may not be necessary. Engraving usually benefits from a lower, steadier airflow that clears smoke without disturbing fine detail.

6. Optional Air Pressure Monitoring for Safer Operation

For users who want to quantify and monitor air assist pressure, an air pressure monitor can be a useful addition. A monitor can be set with a low-pressure threshold. If the air pressure drops below that level, the display can change from green to red, and the relay output can be used to trigger an alarm, stop the machine, or activate a secondary compressor behind a check valve as a redundant air supply.