Aplicable to various focal lenghts, wich are controlled by machine tool control system. Focal point will be automatically adjusted in cutting process to achieve the best cutting effect of different thicknesses sheets of metal. Focal lenght is controlled by the operating system. You don’t need to do manual regulation, wich avoids errors or faults caused by manual operation. Automatic calibration and cleaning functions can achieve fully automatic laser head calibration and nozzle cleaning, eliminating the repetitive manual work and errors.