A method for cutting an inner circumferential surface of a rotating hollow cylindrical workpiece includes: holding the workpiece with a chucking device such that a side surface of the workpiece on a first side in an axial direction of the workpiece is in contact with a contact surface of the chucking device; setting an intersection angle between a rotational center line of the workpiece and an imaginary straight line to an angle smaller than 45 degrees, the straight line being parallel to an axis line of a button tip and intersecting with the rotational center line; and setting a feed direction of the button tip to the inner circumferential surface to a direction from a second side in the axial direction of the workpiece toward the first side in the axial direction thereof, and cutting the inner circumferential surface by use of the button tip rotating about the axis line.

This invention provides a machine tool that, in addition to sequentially separating a chip generated from a workpiece in a reliable manner, improves the roundness of the finished workpiece and improves the visual appearance and roughness of a machined surface of the workpiece, and a control apparatus of the machine tool. A machine tool or a control apparatus thereof includes a vibration frequency setting unit for setting vibration frequency of the reciprocal vibration with respect to one relative rotation when machining a workpiece so that the intersections of paths of a cutting tool during forward movement and backward movement are dispersed on a circumferential surface of the workpiece.

This invention provides a machine tool that, in addition to sequentially separating a chip generated from a workpiece in a reliable manner, improves the roundness of the finished workpiece and improves the visual appearance and roughness of a machined surface of the workpiece, and a control apparatus of the machine tool. A machine tool or a control apparatus thereof includes a vibration frequency setting unit for setting vibration frequency of the reciprocal vibration with respect to one relative rotation when machining a workpiece so that the intersections of paths of a cutting tool during forward movement and backward movement are dispersed on a circumferential surface of the workpiece.

The cutting device includes a rotating portion for rotating the cutting tool in a rotation axis line of the cutting tool and a traveling means for making the cutting tool travel relative to a workpiece. The rotating means and the traveling means rotates the outer peripheral surface of the cutting tool and makes the cutting tool travel, having the outer peripheral surface function as the rake surface, so as to perform cutting machining.

A milling tool includes a body which is rotatable about a first axis. At least one cutting tooth mounted on the body having a cutting edge for cutting about the first axis. A wiper tooth extends from the mill body. The wiper tooth includes at least at a portion having a peripheral surface about the second axis and the peripheral surface intersects a face surface defining a cutting edge that is round about the second axis for cutting about the first axis. In some embodiments, the peripheral surface, the face surface and the cutting edge are formed on an insert that is mounted the mill body.

A milling tool includes a body which is rotatable about a first axis. At least one cutting tooth mounted on the body having a cutting edge for cutting about the first axis. A wiper tooth extends from the mill body. The wiper tooth includes at least at a portion having a peripheral surface about the second axis and the peripheral surface intersects a face surface defining a cutting edge that is round about the second axis for cutting about the first axis. In some embodiments, the peripheral surface, the face surface and the cutting edge are formed on an insert that is mounted the mill body.

A cutter holder assembly has a cutter holder, a cutting unit, a joint connector, and a nut. The cutter holder has a receiving hole, a conical hole, and a connection hole disposed therein and communicating with one another. The cutting unit has an assembling portion inserted in the conical hole, an engaging hole being polygonal, an extension pole extending from the assembling portion, and at least one machining tool assembled to the extension pole. The joint connector is disposed in the receiving hole and has a connection section threaded within the connection hole and an engaging section engaging with the engaging hole. The nut is connected to the cutter holder. Wherein, the joint connector is fixed within the cutter holder and engages with the cutting unit to firmly connect the cutter holder and the cutting unit and to promote machining efficiency and quality of the cutter holder assembly.

A cutter holder assembly has a cutter holder, a cutting unit, a joint connector, and a nut. The cutter holder has a receiving hole, a conical hole, and a connection hole disposed therein and communicating with one another. The cutting unit has an assembling portion inserted in the conical hole, an engaging hole being polygonal, an extension pole extending from the assembling portion, and at least one machining tool assembled to the extension pole. The joint connector is disposed in the receiving hole and has a connection section threaded within the connection hole and an engaging section engaging with the engaging hole. The nut is connected to the cutter holder. Wherein, the joint connector is fixed within the cutter holder and engages with the cutting unit to firmly connect the cutter holder and the cutting unit and to promote machining efficiency and quality of the cutter holder assembly.