A tapered ferrite core having a solid or hollow cylindrical shape with larger length than outer diameter, and comprising a ground taper portion in at least one end portion, the taper portion having ground streaks extending in the longitudinal direction of the ferrite core, can be formed by centerless-grinding a rotating ferrite core by a rotating grinder.

A double-disc straight groove cylindrical-component surface grinding disc, includes a first grinding disc and a second grinding disc, rotating relative to each other; the the first grinding disc's working face is planar; the second grinding disc's surface, opposite the first grinding disc, includes a set of radial straight grooves, with groove faces of the straight grooves are the working face of the second grinding disc; the cross-sectional outline of the working face of the second grinding disc is arcuate or V-shaped or is a V-shape having an arc; during grinding, a workpiece spins inside the straight grooves, while under the effect of an advancing apparatus, the workpiece slides in translational motion along the straight grooves. The described grinding disc device has high-volume production capabilities, and the shape accuracy and size consistency of the cylindrical roller's cylindrical surface and the efficiency in machining are improved, and machining cost is reduced.

A processing apparatus includes a chuck table for holding a workpiece that has a mark representing a crystal orientation, a processing unit, a cassette stage for placing thereon a cassette for storing a plurality of workpieces therein, a temporary rest table, a spinner table, a robot for delivering a workpiece, a determining section for determining whether a workpiece has been properly processed or has not been properly processed, and a control unit for performing a control process for orienting the mark of the workpiece in a predetermined direction if the determining section determines that the workpiece has been properly processed and storing the workpiece in the cassette, and performing a control process for orienting the mark of the workpiece in a direction different from the predetermined direction if the determining section determines that the workpiece has not been properly processed and storing the workpiece in the cassette.

A machine tool for multiple working for material removal from surfaces of bodies including a working station in which a plurality of rotary tools are positioned around a feed trajectory of said bodies; and guide means in which the bodies to be worked are made to translate one after another along said feed trajectory with a predetermined orientation position. At least one pair of rotary tools of said working station, intended to interact with the surfaces to be worked, inside slits in said bodies, in combination with each other and with guide means provided with partitions, help to keep said bodies in position during their related transit through said working station.

A machine tool for multiple working for material removal from surfaces of bodies including a working station in which a plurality of rotary tools are positioned around a feed trajectory of said bodies; and guide means in which the bodies to be worked are made to translate one after another along said feed trajectory with a predetermined orientation position. At least one pair of rotary tools of said working station, intended to interact with the surfaces to be worked, inside slits in said bodies, in combination with each other and with guide means provided with partitions, help to keep said bodies in position during their related transit through said working station.

A tapered ferrite core having a solid or hollow cylindrical shape with larger length than outer diameter, and comprising a ground taper portion in at least one end portion, the taper portion having ground streaks extending in the longitudinal direction of the ferrite core, can be formed by centerless-grinding a rotating ferrite core by a rotating grinder.

A processing apparatus includes a chuck table for holding a workpiece that has a mark representing a crystal orientation, a processing unit, a cassette stage for placing thereon a cassette for storing a plurality of workpieces therein, a temporary rest table, a spinner table, a robot for delivering a workpiece, a determining section for determining whether a workpiece has been properly processed or has not been properly processed, and a control unit for performing a control process for orienting the mark of the workpiece in a predetermined direction if the determining section determines that the workpiece has been properly processed and storing the workpiece in the cassette, and performing a control process for orienting the mark of the workpiece in a direction different from the predetermined direction if the determining section determines that the workpiece has not been properly processed and storing the workpiece in the cassette.

A processing apparatus includes a chuck table for holding a workpiece that has a mark representing a crystal orientation, a processing unit, a cassette stage for placing thereon a cassette for storing a plurality of workpieces therein, a temporary rest table, a spinner table, a robot for delivering a workpiece, a determining section for determining whether a workpiece has been properly processed or has not been properly processed, and a control unit for performing a control process for orienting the mark of the workpiece in a predetermined direction if the determining section determines that the workpiece has been properly processed and storing the workpiece in the cassette, and performing a control process for orienting the mark of the workpiece in a direction different from the predetermined direction if the determining section determines that the workpiece has not been properly processed and storing the workpiece in the cassette.

A motorized blade rest apparatus for a grinding system includes a carriage, a ram assembly, a work rest assembly, a motor, and a computer processor. The carriage moves a regulating wheel along a first axis towards and away from a work wheel. The ram assembly, which moves along a second axis parallel to the first axis, supports the carriage and the work rest assembly. The work rest assembly includes first and second slide portions and a work rest blade. The first slide portion is mounted on the ram assembly. The second slide portion, which is movable relative to the first slide portion, moves along a third axis perpendicular to the first axis. The work rest blade is mounted on the second slide portion. The motor is coupled to the second slide portion, and the computer processor controls the motor to move the second slide portion along the third axis.

A machine tool for multiple working for material removal from surfaces of bodies including a working station in which a plurality of rotary tools are positioned around a feed trajectory of said bodies; and guide means in which the bodies to be worked are made to translate one after another along said feed trajectory with a predetermined orientation position. At least one pair of rotary tools of said working station, intended to interact with the surfaces to be worked, inside slits in said bodies, in combination with each other and with guide means provided with partitions, help to keep said bodies in position during their related transit through said working station.