Methods for adjusting the focal length of laser marking machines!

The first method: continuous light test method.

Draw a square or circle of about one centimeter on the marking software. After regular filling, adjust the laser energy to a relatively large level in the laser setting parameter bar, and try to use a low frequency. Then check continuous marking, and place a metal business card or other shielding object at the laser projection position on the product surface. Continuously emit light for marking, and shake the Z axis up and down until the laser acts on the metal business card with the strongest energy, the crispest sound, and the brightest color. This is basically the focal length. Test it up and down several times to find the right focal length. This method is more suitable for 1064nm wavelength fiber laser marking machines, semiconductor laser marking machines, end-pumped laser marking machines, 355nm ultraviolet laser marking machines, 532nm green laser marking machines, etc. For carbon dioxide laser marking machines, you can find a piece of white paper, then draw a box in the marking software, continuously emit light and shake the Z axis, and when the line on the paper is the thinnest, it is the focal length surface.

The second method: measuring focal length method.

After the equipment manufacturer informs you of the focal length data of the current equipment, you can record it, and then every time you switch products. You can directly use a steel ruler to lean against the surface of the product. The scale value refers to a reference surface on the field mirror, and shake it up and down to the scale data. This method is applicable to all laser marking machines, but there is a disadvantage that if the position of the product to be laser engraved is concave or not suitable for inserting the steel ruler, this method is not very practical.

The third method: double red light point value method.

This method requires that the equipment itself has this hardware configuration when it leaves the factory. One or two oblique red lights are installed on the galvanometer or next to the galvanometer. Using some principles of right-angled triangles, use a fixed right-angled side and two overlapping hypotenuses to find the other right-angled side of the focal length surface. You only need to shake up and down until the two red light indicator points overlap to quickly find the focal length. Although this method is convenient and fast, it requires the equipment manufacturer to cooperate with this device. In addition, if it is not adjusted well or shifted in the middle, it is easy to mislead and form an incorrect focal length surface.