When I was a child, people who played with magnifying glass and burned paper knew that the position of focus was very important. It gathers the greatest energy. The same is true of CNC fiber laser metal cutting machine. If the focus is not fixed, the cutting quality will be very poor. There are three ways to adjust the focus position.

1. Dotting method: move the cutting head of the optical fiber laser metal cutting machine from top to bottom, place the laser beam lattice on the metal plate, and the focus position is the place with the smallest lattice diameter.

2. Blue spark method: pull out the nozzle of the optical fiber laser metal cutting machine, blow air, hit the pulse laser on the stainless steel plate, and move the cutting head from top to bottom until the maximum blue spark is the focus position.

3. Inclined plate point finding method: the cutting head of optical CNC fiber laser cutting machine shall form the same vertical right angle with the inclined plate, pull the metal plate horizontally, and the laser beam is the minimum focus position.

When the focus of optical fiber laser metal cutting machine is in the best position, it should not be too high or too low. It has the smallest slit, the highest efficiency and the best cutting quality. It should be noted that the focus positions of steel plates with different thickness are different.