After the blades are finished to the desired hardness and toughness by heat treatment, they are ”roughly” ground by an automatic grinding machines and passed to the next process Wheel Whetstone Manual Grinding.

​It is a craftsmanship that involves fine-tuning of the machines at the level of a few tenths of a millimeter, even if only "roughly". Since this process is the core of production efficiency, we are increasing the number of machines and craftsmen to ensure a stable supply.