A numerical control device (1) of a machine tool capable of controlling its spindle rotating speed includes: a program analyzing unit (2) that reads ahead a machining program (6) by one block or more and analyzes a command for the machine tool; and a command determining unit (3) that determines, based on a result analyzed by the program analyzing unit (2), whether a command posterior to a spindle control command causes any machining problem when the command is executed during a spindle rotating speed change, outputs a first command, in which some problem occurs in the machining, after the spindle rotating speed reaches the commanded rotating speed, and output a second command, which is other than the first command, before the spindle rotating speed reaches the commanded rotating speed.

An actuator control method and an actuator control device that incorporate an element of feedback control in time optimal control, including: a calculation step of calculating a switching time at which an acceleration output is switched to a deceleration output and an end time of the deceleration output expressed by time elapsed from a calculation time at which calculation for control is performed using a maximum acceleration and a maximum deceleration, which are measured in advance, at the time of the maximum output of control force of an actuator; a control output step of setting the control force of the actuator to a maximum acceleration output from the calculation time to the switching time, setting the control force of the actuator to a maximum deceleration output from the switching time to the end time, and ending the output of the control force at the end time, and an update step of calculating and updating the switching time and the end time by repeating the calculation step at each preset time.

A laser plotter and method for operating a laser plotter for cutting, engraving, marking and/or lettering a workpiece are disclosed. When an irradiation source is activated, a laser beam is directed via deflection elements to a focusing unit. A control unit performs the control on the basis of set parameters and/or a loaded job. The data, in particular job, are received via a computer unit, and a calculation of the path planning is performed offline by the computer unit or externally by a cloud solution or component. The path planning and other data are transferred to a PLC controller or soft PLC, from which at the sampling times, the individual target data, in particular the path planning and other data, such as the speed, are then sent step by step via an industrial bus to at least the modules for axle control and laser control.