A control part of a control device includes a learning controller and a learning determination part. The learning controller performs learning control in which a correction amount of a resultant command is obtained, based on an oscillation phase obtained from an oscillation command and the resultant command, and the correction amount is added to the resultant command. The learning determination part determines whether or not the oscillation amplitude of the oscillation command is smaller than a predetermined threshold, and when the oscillation amplitude is smaller than the predetermined threshold value, the learning determination part both sets the oscillation command generated by an oscillation command generation part to zero and turns off the learning control or only turns off the learning control.

A control part of a control device includes a learning controller and a learning determination part. The learning controller performs learning control in which a correction amount of a resultant command is obtained, based on an oscillation phase obtained from an oscillation command and the resultant command, and the correction amount is added to the resultant command. The learning determination part determines whether or not the oscillation amplitude of the oscillation command is smaller than a predetermined threshold, and when the oscillation amplitude is smaller than the predetermined threshold value, the learning determination part both sets the oscillation command generated by an oscillation command generation part to zero and turns off the learning control or only turns off the learning control.

A balancing device for a bar loading magazine for guiding material bars on a turning machine, includes at least one mass body that can be repeatedly positioned in relation to a guiding unit that allows a rotation of an introduced material bar about a rotary axis. The mass body is, after each completed positioning, in a connection with the guiding unit and/or the material bar, so that the mass body rotates, during the rotation of an introduced material bar, together with the material bar at the same angular speed about the rotary axis. At least one positioning unit is designed to bring the mass body into a starting position in relation to the guiding unit, to detect during rotation any required repositioning because of an imbalance, and to reposition in each case the mass body in response to the detection of any required repositioning in relation to the guiding unit.

A balancing device for a bar loading magazine for guiding material bars on a turning machine, includes at least one mass body that can be repeatedly positioned in relation to a guiding unit that allows a rotation of an introduced material bar about a rotary axis. The mass body is, after each completed positioning, in a connection with the guiding unit and/or the material bar, so that the mass body rotates, during the rotation of an introduced material bar, together with the material bar at the same angular speed about the rotary axis. At least one positioning unit is designed to bring the mass body into a starting position in relation to the guiding unit, to detect during rotation any required repositioning because of an imbalance, and to reposition in each case the mass body in response to the detection of any required repositioning in relation to the guiding unit.

A work-piece support member forming part of a spindle liner for use within the hollow spindle of a turning machine comprising: a disc dimensioned to fit closely within the hollow spindle, having a central aperture (A) sized to accept a work-piece; holding at least one helical spring (20) positioned adjacent to the aperture (A); such that in use the axis of said spring is held perpendicular to the axis of said work-piece such that part of the side walls of said spring or springs (20) abut against said work-piece and thereby firmly support said work-piece as it rotates with the hollow spindle about the axis of said hollow spindle.

A work-piece support member forming part of a spindle liner for use within the hollow spindle of a turning machine comprising: a disc dimensioned to fit closely within the hollow spindle, having a central aperture (A) sized to accept a work-piece; holding at least one helical spring (20) positioned adjacent to the aperture (A); such that in use the axis of said spring is held perpendicular to the axis of said work-piece such that part of the side walls of said spring or springs (20) abut against said work-piece and thereby firmly support said work-piece as it rotates with the hollow spindle about the axis of said hollow spindle.

Bar feeder (1) comprising a guide channel (10) centred on an invariable guide axis (A-A), characterised in that the guide channel (10) is adjustable and is formed by an adjustable guide element which can define a guide channel with a constant centre (C) corresponding to a bar diameter comprised between a maximum bar diameter (DMax) in a first position (P1) and a minimum bar diameter (DMin) in a second position (P2) under the action of a device for adjusting the diameter of the guide channel (2).

Bar feeder (1) comprising a guide channel (10) centred on an invariable guide axis (A-A), characterised in that the guide channel (10) is adjustable and is formed by an adjustable guide element which can define a guide channel with a constant centre (C) corresponding to a bar diameter comprised between a maximum bar diameter (DMax) in a first position (P1) and a minimum bar diameter (DMin) in a second position (P2) under the action of a device for adjusting the diameter of the guide channel (2).

A micro vibration damping system includes: one or more sensors configured to sense an instantaneous acceleration of a tool post during machining of a work piece; and a driver configured to drive the tool post in a direction orthogonal to an axial direction of the work piece according to the instantaneous acceleration of the tool post.

A micro vibration damping system includes: one or more sensors configured to sense an instantaneous acceleration of a tool post during machining of a work piece; and a driver configured to drive the tool post in a direction orthogonal to an axial direction of the work piece according to the instantaneous acceleration of the tool post.