Abstract: Polishing machine with an improved sample holding table in which the table has a cardan system with two first shafts having a first common longitudinal axis and two second shafts having a second common longitudinal axis. The shaft axes being in a polishing plane and intersecting in the center of the sample face to be polished. The machine can be applied to the production of magnetic read-write heads.

Abstract: In a method of polishing a dental instrument, the dental instrument made of a ceramic material and having fine irregular portions along a surface thereof is placed in a container, together with a spherical ceramic whose grain size is 30.about.400 .mu.m, and an abrasive whose grain size is at most equal to 20 .mu.m and a liquid. The container is moved whereby the dental instrument is polished effectively.

Abstract: A machine for cutting concrete blocks especially continuously molded, highway dividing barriers of the New Jersey type, in a very fast and easy manner. The machine is mounted on a support base forming part of a powered truck-like vehicle and includes a primary extensible boom that is mounted on the support base so as to extend horizontally laterally thereof and be adjustably tiltable about its longitudinal axis. The machine also includes a secondary extensible boom that is mounted on the extensible end of the primary boom. Both of these booms extend in a same plane, and the secondary boom is downwardly tiltable about an axis transversal to both of the primary and secondary booms. A rotary, concrete-cutting saw assembly is mounted at the bottom end of the secondary boom. This assembly includes a saw blade that extends parallel to the plane in which said primary and secondary booms extend.

Abstract: An auxiliary device for a machining tool that converts a standard rotary machining tool into an oscillation-machining tool. The device has a chuck, or other workpiece gripping device, at an upper end of a shaft. The shaft may be rotated around an axis parallel to the axis of the rotary machining tool and may be oscillated along the rotary axis. The degree of oscillation may be adjusted dependent on the length of the surface to be machined.

Abstract: The expanding device for supporting emery cloth sleeves in particular, includes a shaped shaft which concentrically supports a plurality of mutually facing disks which can slide in an axial direction and which are rigidly rotationally connected with the shaft. The disks define, between one another in cooperation, a plurality of peripheral seats for the accommodation of elastic rings which can expand radially upon the axial compression of the disks. The elastic rings are suitable for engaging the inner surface of an emery cloth sleeve.

Abstract: A method and apparatus for buffing a tread is described. The method comprises mounting a tread on an apparatus capable of bufffing the casing engaging surface of said tread, the apparatus buffing the tread such that the grooves are formed on the buffed tread surface. The grooves angularly intercept a tread edge.

Abstract: A securing apparatus for a tool, especially a grinding wheel, including a rotatably driven spindle and a hydraulically expandable securing member, which is provided for securing the tool on the spindle and is provided with at least one hydraulic medium chamber. The securing member is a securing sleeve that is provided on the spindle, with the at least one hydraulic medium chamber communicating with a first bore that extends through the spindle and is provided for supplying the hydraulic medium. The spindle is provided with a tightening screw that can selectively close off the first bore and can be backed off into a pressure relief position. At least one axial securing element is disposed on the securing apparatus in such a way as to be axially displaceable and is adapted to be positively connected with the tool in the axial direction.

Abstract: The present invention relates to an abrasive article comprising an aligned row of connected abrasive sheet members each having a main portion, an aperture formed in the main portion, and a plurality of arm portions perimetrically spaced about the main portion at a constant angle with respect to each adjacent arm portion. The sheet members are formed to enable the aligned row to be Z-folded such that the apertures of each respective sheet member are substantially in register, and the arm portions of each abrasive sheet member are angularly offset with respect to the arm portions of each immediately adjacent abrasive sheet portion by one-half of the angle between each of the arm portions.

Abstract: An abrasive article comprising a coated abrasive bonded to a substrate by means of a metallic adhesive and a method for producing the abrasive article by heating.