For producing a cylindrical surface that has a surface structure of predetermined geometry suitable for application of material by thermal spraying, a geometrically predetermined groove structure of minimal depth and width is introduced into the surface by a tool embodied as a follow-on tool in that a groove cross-section is processed successively to a final size. In order for the surface to be producible in mass production with constant quality, the groove structure is worked in such that first a base groove is introduced with a groove bottom width that is smaller than the groove bottom width of the finished groove. Subsequently, at least one flank of the base groove is processed for producing an undercut groove profile by a non-cutting action or cutting action wherein the introduced groove structure is deformed in such a way that the groove openings are constricted by upsetting deformations of material.

A boring bar head body is disclosed. An example boring bar head includes a front face, an attachment face opposed to the front face, and an axis substantially perpendicular to the front face and attachment face. The attachment face is operably connected to a boring bar. The front face includes a low plane, a high plane, and an insert groove in between at least a portion of the high and low planes. In the insert groove there is at least one cutting insert that has a cutting surface and a bottom surface. The cutting insert is removably attached to the insert groove.

A formed rotary cutting tool includes a cutting edge defining a cutting edge diameter that is increased and reduced in a direction of an axis of the tool, so as to have at least one neck portion in which the cutting edge diameter is minimized. The cutting tool includes a roughing portion which is provided on a periphery thereof and which is constituted by a succession of protrusions and recesses arranged in the direction of the axis. The roughing portion includes (i) a fine roughing portion that is provided in at least one of the at least one neck portion, and (ii) another portion that is provided in a portion that is other than the at least one of the at least one neck portion. The fine roughing portion of the roughing portion is different in characteristics from the above-described another portion of the roughing portion.

Provided is a machining apparatus capable of improving the positioning accuracy of a machining tool as compared to conventional machines. A machining apparatus 1 includes a rotating tool, a machining tool provided on an outer periphery of the rotating tool, and a spindle head adapted to rotatably support the rotating tool. The machining apparatus includes a driving portion configured to move the spindle head in a direction perpendicular to an axis of rotation R of the rotating tool, a position sensor configured to measure a position of the spindle head on a plane perpendicular to the axis of rotation R, and a control unit configured to control the driving portion so as to move the machining tool in a direction perpendicular to the axis of rotation R of the rotating tool on the basis of the position of the spindle head.

An actuatable boring bar is configured to place a cutting insert cartridge received onto the boring bar in a cutting position when the centrifugal force generated by the rotation of the boring bar about the rotation axis reaches a centrifugal force threshold and in a non-cutting position when the centrifugal force generated by the rotation of the boring bar about the rotation axis is below the centrifugal force threshold. The boring bar is further configured so that the cutting insert cartridge can be set-up onto the boring bar in the cutting position.

An automatic lathe includes a main spindle that rotates a workpiece about a shaft center, a cutting tool that processes the workpiece, a feeder that moves the cutting tool, an input receiver that receives inputs regarding an eccentric distance and a radius, and a controller that controls the movement by the feeder such as to set a virtual circle having a radius of the distance, to set an offset virtual circle having a center at a position where a center of the virtual circle is offset from the shaft center of the workpiece in the radial direction of the workpiece by the radius, and to move the cutting tool along an circumference of the offset virtual circle in relation to a rotation of the workpiece by the main spindle. A hole is processed, which has the radius at a position away from the shaft center by the distance.

An object of the present invention is to provide a cutting tool capable of expanding a range in which adjustment work can be readily performed and reducing manufacturing cost. Provided is a cutting tool including: a cartridge to which a cutting member having a cutting edge is fixed; a body having at least one cartridge mounting part in which the cartridge is installed; and an adjustment plate installed between walls or a bottom surface constituting the cartridge mounting part and the cartridge, wherein the walls or the bottom surface of the cartridge mounting part has a recessed part for housing the adjustment plate.

A cutter assembly for a boring bar may include a cutter body, a cutter-element carrier, and an adjustment assembly having an adjustment element. The cutter-element carrier may be configured to be slidingly received in a channel in the cutter-body. The cutter-element carrier may have a first surface transverse to the first line. The adjustment element may have a second surface defining a position of the cutter-element carrier in the channel when the second surface is in contact with the first surface. The adjustment element may be movable along a second line transverse to the first surface for adjusting the position of the cutter-element carrier in the channel. The cutter body may include first and second recess portions. First and second insert portions may be inserted into the first and second recess portions, respectively, and may define float travel-limits for the cutter body.

A cutter assembly for a boring bar may include a cutter body, a cutter-element carrier, and an adjustment assembly having an adjustment element. The cutter-element carrier may be configured to be slidingly received in a channel in the cutter-body. The cutter-element carrier may have a first surface transverse to the first line. The adjustment element may have a second surface defining a position of the cutter-element carrier in the channel when the second surface is in contact with the first surface. The adjustment element may be movable along a second line transverse to the first surface for adjusting the position of the cutter-element carrier in the channel. The cutter body may include first and second recess portions. First and second insert portions may be inserted into the first and second recess portions, respectively, and may define float travel-limits for the cutter body.

Provided is a boring tool capable of suppressing wear of a cutting blade according to a shape of a bore to be formed in a workpiece. The tool includes a tool body to be attached to a spindle of a rotary machining tool, and a plurality of cartridges each attached to a leading end face of the tool body, having a cutting blade and being position-adjustable in a radial direction. The tool body has a coolant passage for transporting coolant along a rotational axis direction. A discharge hole for the coolant is comprised of a first discharge hole provided between the plurality of cartridges in a leading end face and a second discharge hole provided in an outer circumference of the tool body and directed toward the cutting edge of the cutting blade.