Cutting quality in a great extent depends on whether the lens is in the middle. If the lens is not in the middle, the laser beam may contact with nozzle or inner wall to produce high temperature deformation. Lens centering operation should be considered when nozzle is replaced or the cutting quality declines.

Lens centering of laser cutting head can be finished by adjusting focus lens, X-Y direction. The adjusting screw is located on the top of the cutting head as shown in picture below. By using inner hexagon spanner can loosen or screw the adjusting screw until the beam is located in the middle of nozzle. Make sure the laser beam output from the center of nozzle. Usually we used tape dotting method:

1. Pick a scotch tape, flatten it, and attach it to the nozzle tip;
2. Open the inner guiding red light of the laser. Find and observe the position of nozzle center that the red light in the scotch tape relative to;
3. Next open and adjust laser generator at the range of 80W-100W and dot manually.
4. Tear off the tape and check the hole in the center of the nozzle;
5. Repeat the above steps to find the optimum relative nozzle center position of the beam;
6. This adjustment requires a series of adjustments, which is the basic operation of general laser beam adjustment.