Patent ID: 6851901

Claim:
A machine tool for cutting machining of a cylindrical hole of a workpiece comprising: a tool having: a mounting portion by which the tool is mounted in the machine tool, a tool shaft, which has a first inner end, connected to the mounting portion, and a second outer end, a longitudinal center axis, which extends through the mounting portion and the tool shaft, and a main cutting edge, which is provided on the tool shaft, first means arranged to rotate the tool with a first rotational movement around the center axis; second means arranged to rotate the tool shaft in such a way that the tool performs a second rotating movement around a second axis, which is parallel to and located at a distance from the center axis; and third means arranged to feed the tool or the workpiece in relation to each other in such a way that the tool performs a third feeding movement in a direction of the center axis; wherein said main cutting edge has an extension in the direction of the center axis along an imaginary envelope surface, which is concentric with the center axis and located radially outside an outer periphery surface of the tool shaft and cylindrical along a substantial length thereof, wherein said main cutting edge is rounded at an axially inner end, and wherein said main cutting edge is arranged to permit cutting engagement with said workpiece when the tool is rotated around the longitudinal center axis.