In the D9, the moving part under high load is a sliding pair, and the sliding surface is scraped. A highly accurate flat surface of 3/100 mm or less is obtained, achieving both high rigidity and wear resistance. And it is worth noting that the clearance is formed over a very long distance. Its strength lies in the precision with which it can be moved smoothly in all places. In addition, we have obtained a high level of lubrication performance that cannot be achieved only by smoothness by adding a minute recess to the surface. Therefore, it keeps the ideal lubrication condition even under severe usage conditions and realizes extremely smooth and powerful cutting. In addition, the scraped surface has a quaint texture that feels the warmth of human hands and reminds even the life of a craftsman, compared to the orderly surface of mechanical processing.