Abstract: A heat exchanger tube manufacturing method to manufacture heat exchanger tubes in a production line. The method includes the steps of molding a plurality of dimples in a plate material, which is payed out continuously, folding back the molded plate material along an axis extending in the direction in which the plate material is payed out to form the molded plate material into an intermediate tube body and cutting the intermediate tube body into parts of a predetermined length.

Abstract: A tool gripper which holds a plurality of tools in arm portions thereof. The gripper is provided in a tool rack type magazine that accommodates tools used in machine tools, and each of the arm portions of the tool gripper is arc-shaped and opened in an obliquely upward direction so that a tool entrance of the arm portion faces obliquely upward over a tool holding portion of the arm portion. The tool gripper is obtained by processing a continuous, elongated plate with laser or press to form the arm portions, and such a plate can be obtained by overlaying a plurality of thin plates in the thickness direction into a sandwich structure.