When it comes to laser cutting machines, the key to unlocking their full potential lies in selecting the appropriate cutting focus. Here, we explore the three main focuses of laser cutting machines to help you make informed decisions for your specific cutting needs.
1.Cutting Focus on the Workpiece (Negative Focal Length)
This method, also known as negative focal length, positions the cutting point above the surface of the material being cut. It’s particularly effective when dealing with thick plates, where a larger cutting width is necessary to ensure an ample supply of oxygen and prevent a drop in cutting temperature. However, one trade-off is that this method may result in a relatively rough cutting surface, making it less suitable for high-precision laser cutting applications.
2.Cutting Focus Inside the Workpiece (Positive Focal Length)
Also referred to as positive focal length, this method involves placing the cutting point inside the workpiece. It is commonly employed when cutting materials like stainless steel or aluminum steel plates with high hardness. Despite its effectiveness, this mode has some downsides, such as a larger cutting width and a longer cutting and perforation time. It requires a substantial cutting airflow and sufficient temperature. Choose this method when working primarily with hard materials like stainless steel or aluminum.
3.Cutting Focus on the Workpiece Surface (0 Focal Length)
Known as 0 focal length, this method is ideal for cutting materials like SPC, SPH, SS41, and others. In this mode, the cutting machine’s focus is set close to the surface of the workpiece. The result is a difference in smoothness between the upper and lower surfaces of the workpiece. The surface close to the focus tends to be smoother, while the lower surface, away from the cutting focus, may appear rough. Select this mode based on the specific requirements of the upper and lower surfaces in your application.
The choice of focus mode plays a crucial role in optimizing the performance advantages of a laser cutting machine. Depending on the material and precision requirements of your workpiece, selecting the right focus ensures that you harness the full capabilities of the laser cutting technology.