A controller of a machine tool determines in accordance with a machining program whether a first tool post is used to machine an unfinished workpiece. When the unfinished workpiece needs machining before terminating a continuous machining and when the controller determines that the first tool post is used to machine the unfinished workpiece W2, the controller simultaneously advances a first system and a second system in accordance with the machining program while preventing machining a workpiece held by the first spindle. When the controller determines that the first tool post is not used to machine the unfinished workpiece, the controller stops the first system and advances the second system in accordance with the machining program.

Method and assembly for assisting a fitter in fitting parts to profiles for manufacturing construction elements of a steel construction. With the method, by using a software application fitting information is generated on the basis of the information obtained from 3D-model data of a 3D-model of the steel construction. The software application interprets 3D-model data and generates for at least one mark or phase of the steel construction a digital or physical list of parts which provides the logistical order in which the parts are supplied to the fitter and a digital or physical list of profiles which provides the logistical order in which profiles are supplied to the fitter. Additionally, specific welding parameter information for each part which has to be welded to a respective profile and graphical information which is presented on a screen which is in the working environment of the fitter may be generated.

A numerical control device according to an embodiment of the present disclosure is a numerical control device for controlling at least two oscillating drive axes which linearly drive so as to cause mutually differing targets to change speed regularly at a fixed period, based on a machining program, in which the numerical control device controls the at least two oscillating drive axes so as to keep fixed a phase difference of periodic variable components of the at least two oscillating drive axes.

A numerical control device according to an embodiment of the present disclosure is a numerical control device for controlling at least two oscillating drive axes which linearly drive so as to cause mutually differing targets to change speed regularly at a fixed period, based on a machining program, in which the numerical control device controls the at least two oscillating drive axes so as to keep fixed a phase difference of periodic variable components of the at least two oscillating drive axes.