PURPOSE: To form a wire for which the feed of grinding-grains is unnecessary by continuously passing a sawing-wire material into a tank filled with diamond grinding-grains and removing the excessive grinding-grains by vibrating the material attached with grinding-grains and allowing said material to pass through a galvanizing tank and fixing grinding-grains onto the material.

CONSTITUTION: A sawing-wire material 5 sent-out from a wire drum 4 is allowed to pass through a water tank 6 to drench the surface of the material 5, and then sent into a diamond grinding-grain tank 7 and attached with diamond grinding- grains. Then, excessive grinding-grains are allowed to fall-off by a vibrating machine 8, and the material is sent into a galvanizing tank 9, and the diamond grinding-grains are fixed onto the material 5, which is taken-up onto a product drum 10.