Abstract: A cartridge assembly for use on a boring bar includes: a main body having an internal thread disposed about an axis; a tubular shaft movable with respect to the main body along the axis, the shaft having an internal thread and a portion structured to receive a cutting mechanism; a torque-receiving assembly having a first and second threaded parts, the first threaded part cooperatively engaging the internal thread of the shaft, the second threaded part cooperatively engaging the internal thread of the main body; and an entrainment cover coupled to the torque-receiving assembly and rotatable with respect to the main body about the axis. The entrainment cover interacts with the main body in a manner that produces an indicating click upon rotation thereof, each click being indicative of a distance the shaft is displaced in regard to the main body as a result of the rotation of the entrainment cover.

Abstract: A cartridge assembly (1) with fine-adjustment (AJ) indicating click (CI) used on a boring bar, for general machining, allows for the precise adjustment of the dimensional aspects of measurements with tolerances down to a thousandth of a part. The cartridge (1) is configured by a set of parts that can be coupled to one another and that are coaxial, formed by a tubular main body (2) provided with an internal thread (2A) with differential pitch upon which are mounted a likewise tubular movable shaft (3) and a threaded part (4A) of the torque-receiving assembly (4) which, in turn, incorporates an entrainment cover (5) provided with the indicating click (CI). The indicating click is configured by the popping of individual spheres (6) generated by means of indexation of diametrical milling (5A) provided on the entrainment cover (5). The movable shaft (3) receives a conventional cutting mechanism (7) and also has an internal thread (3A) for the mounting of a threaded part (4A) of the torque-receiving assembly (4).