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.

A method for roughening an inner surface (8) of a cylindrical bore (9), in particular a running surface in a cylindrical bore or cylinder liner of an internal combustion engine. A rotating tool (1) is moved in a translatory manner in the axial direction of the cylindrical bore (9) and has a radial cutting head (7). A chip (12) is lifted off by at least one cutting edge of the radial cutting head (7) and is broken away via a further edge or face of the radial cutting head (7), in order to produce the roughened surface. The tool (1) is introduced into the cylindrical bore (9) or is passed through it, after which a positioning of the tool (1) in the radial direction takes place, and after which the removal of the material takes place via the rotating tool (1) when the tool is moved in its advancing direction (V) out of the cylindrical bore. A tool (1) is also claimed.

A tool head includes a first tool and a second tool disposed circumferentially on the tool head where the tool head has a rotation axis. The first tool of the tool head is an adjustable tool that is radially movable such that a radial position, relative to the second tool of the tool head, is settable.