A tool drive unit for a turning device for machining workpieces has a tool holder driven in a displaceable manner along an infeed direction by a first linear motor and driven in a pendular/displaceable manner in a direction transverse to the infeed direction by a second linear motor. Both linear motors have a moving coil/piezo element. The turning device has a main infeed drive, which produces a primary infeed movement of a turning tool in an infeed direction, and has a main transverse drive which produces a primary transverse movement in a transverse direction transversely to the infeed direction. The turning device has a secondary transverse drive whose movements are oriented in the same direction as the main transverse drive, wherein the turning tool and the axis of rotation can be moved towards one another and away from one another by the superimposition of primary and secondary transverse movements.

A machining method for at least one shaping machining operation can include carrying out a machining operation over a first distance using a cutting tool which is subjected to axial oscillations as it moves forward, then reducing the amplitude of the axial oscillations while continuing to drive the cutting tool in terms of rotation.

The disclosure relates to cubic boron nitride inserts for machining iron-based workpieces, as well as related methods and apparatuses. The insert includes a cutting element containing cubic boron nitride (cBN) in an amount in a range of 50 wt. % to 95 wt. % based on the cutting element, and a binder containing at least one of (i) alumina (Al.sub.2O.sub.3) and a manganese material (e.g., an oxide such as MnO.sub.x) and (ii) zirconia (ZrO.sub.2). The insert can be used for various machining processes, for example turning or boring. Suitable workpieces include iron-based materials or ferrous alloys, for example a cast iron such as compacted graphite iron (CGI).

A drill device for removing plugging in pipes, the drill device including: a drill bit for breaking plugging in pipes; a vertical control handle capable of controlling a vertical movement of the drill bit; a drill handle capable of controlling a rotational movement of the drill bit; a screw disposed coaxially with the drill bit; a drill shaft having a first portion surrounding the screw and a second portion to which the drill bit is fixed; and a guide shaft surrounding the first portion of the drill shaft. The vertical control handle and the drill handle are disposed on an extension line of the axis of the screw; the screw is vertically moved by rotations of the vertical control handle; and the guide shaft is rotated by rotations of the drill handle, and in conjunction therewith, the drill bit can be rotated.

A control method for using a core drilling system is disclosed. In an embodiment the method includes detecting a predetermined drilling situation on the basis of the attainment of a predetermined threshold value for at least one predetermined corresponding drilling parameter and ending the core drilling operation by selecting a reverse-travel mode for removing the drilling tool from the borehole if the advancing device does not reach a predetermined threshold value for a predetermined corresponding distance value in a direction and the core drilling machine does not reach a predetermined threshold value for at least one predetermined corresponding drilling parameter or continuing the core drilling operation by selecting a predetermined operating mode if the advancing device reaches a predetermined threshold value for a predetermined corresponding distance value in a direction and the core drilling machine reaches a predetermined threshold value for at least one predetermined corresponding drilling parameter.

A tool drive unit for a turning device for machining workpieces has a tool holder driven in a displaceable manner along an infeed direction by a first linear motor and driven in a pendular/displaceable manner in a direction transverse to the infeed direction by a second linear motor. Both linear motors have a moving coil/piezo element. The turning device has a main infeed drive, which produces a primary infeed movement of a turning tool in an infeed direction, and has a main transverse drive which produces a primary transverse movement in a transverse direction transversely to the infeed direction. The turning device has a secondary transverse drive whose movements are oriented in the same direction as the main transverse drive, wherein the turning tool and the axis of rotation can be moved towards one another and away from one another by the superimposition of primary and secondary transverse movements.

An assembly and method for drilling micro holes in a tube including an outer wall having opposing open ends and forming an inner channel. The method includes the steps of submerging the tube in water so the water fills the inner channel, retaining the water in the inner channel, freezing the water in the inner channel so as to form an ice backing in the inner channel, and drilling through the outer wall such that the ice backing supports the outer wall and prevents the outer wall from deforming or distorting near the hole location.

A turning method for a computerized numerical control lathe performs the steps of: providing a cutting tool including a coupling portion, an intermediate portion and a cutting portion, a longitudinal center axis of the coupling portion defining a tool rotational axis, the cutting portion including a top surface, a first nose portion, the first nose portion including a first cutting edge, a second cutting edge, and a convex nose cutting edge connecting the first and second cutting edges; providing and rotating a metal work piece around a work piece rotational axis, which is set perpendicular to the work piece rotational axis; making a first pass where the first cutting edge is active and the second cutting edge is inactive; making a second pass where the first cutting edge is inactive and the second cutting edge is active; and rotating the turning tool around the tool rotational axis.

An assembly and method for drilling micro holes in a tube including an outer wall having opposing open ends and forming an inner channel. The method includes the steps of submerging the tube in water so the water fills the inner channel, retaining the water in the inner channel, freezing the water in the inner channel so as to form an ice backing in the inner channel, and drilling through the outer wall such that the ice backing supports the outer wall and prevents the outer wall from deforming or distorting near the hole location.

A device for the fine machining of a circumferential workpiece surface arranged eccentrically relative to an axis of a workpiece. The device comprises a pressure mechanism configured to press a fine-machining tool against the circumferential workpiece surface. The device also includes a drive unit configured to drive an active section of the pressure mechanism via a first drive and a second drive. The first drive drives the active section in a movement plane that runs crosswise to the workpiece axis along a first movement trajectory. The second drive drives the active section along a second movement trajectory that is at an angle to the first movement trajectory.