Engraving machines such as the K500 or K6 by "Hell Gravure Systems" use a diamond "pen" to cut cells. Each cell creates one printing dot later in the process. A K6 can have up to 18 engraving heads each cutting 8,000 cells per second to an accuracy of 0.1 µm and below. They are of course fully computer controlled and the whole process of cylinder making is fully automatic.