Characters and symbols are engraved on the surface of a workpiece directly, therefore, they does not get invisible easily, lasting semipermanently.
 
Principle of Marking
  1. A cone-shaped stylus is pressed against the surface of a workpiece with high-speed vibration to form a cone-shaped hollow on the surface. As the stylus moves, a line is formed along the stylus.
  2. By controlling the stylus movement numerically depending on the characters to be marked, the characters can be marked.