How to find the focus of fiber laser marking machine- XTLASER

Fiber laser marking machine is becoming more and more popular in various fields. Because its price is becoming lower and lower. It is very easy to operate. But there are still some people have poor experience on laser machine. They may face many small questions or doubt, especially on focus. Many people don’t know how to find the focus.

Why need to find Fiber Laser Marking Machine Focus?

Fiber laser marking machine need to adjust working size through F-theta lens. The F-theta lens is one convex lens, like a magnifying lens. We know it have focus length from lens to pieces. With this length, all light power focus on one point and have very high power. Fiber laser marking machine use this theory focus all laser in one point. Then the laser will leave marks after high temperature.

So only when machine on correct focus, laser marking machine will work well. This is why we need to find correct focus before use laser machine.

How to Find Fiber Laser Marking Machine Focus

There are mainly three ways to help us find the correct focus.

In the beginning, we need to look for focus manually. We can put one small metal piece on working area and select „Continue“ button. Then we need to adjust the laser marking head up and down and check the laser light. When there is very strong laser light works on the metal surface, it is the focus. This way the the most common way and easy to learn.
Measure the length. Different working size F-theta lens have special focus length. We can measure the length from F-theta lens to working piece. This way have some problems as the measurement may have some error. Still we need do some fine adjustment after find the focus by this way.
Outside red pointer. We install one extra red pointer under laser marking head. When machine open there are two points. When the two points coincide together, it is the correct focus. Now we install it for all our machine. It can save much time for users.

Teresa Ren