Cutting objects in different height, need to readjust the laser focus.

Step 1

Put a gray paper at the height of the object.

Step 2

Wear protective glasses.

Step 3

Turn on the laser (strong).

Step 4

Trun the bottom of the laser left and right. Make the laser focus became smaller. The paper should be burned while the laser focus is smallest.

Step 5

Continue and move the paper. See the mark burned by the laser. Stop when the mark is small and continuity.

Using focus stick, make the distance from laser to working object is as long as the stick.