To enable turning-on/off of constant surface speed control during machining. A numerical control device has a constant surface speed control function for controlling a spindle rotation rate to make a surface speed constant, and includes: a surface speed calculating unit for calculating a surface speed based on a spindle rotation speed having been designated and a distance from a rotation center; a cutting speed setting unit for setting a minimum cutting speed and a maximum cutting speed; a comparison unit for comparing the surface speed with the minimum cutting speed and the maximum cutting speed; and an operation control unit for controlling whether to activate the constant surface speed control function based on a result of the comparison made by the comparison unit.

A method automatically determines machining parameters for a machining process, in which a machining head is guided along a machining path over at least one workpiece to be machined, and, depending on the respective position along the machining path, certain machining parameters are selected from stored machining parameters on the basis of predefined conditions for machining the at least one workpiece, and a device machines a workpiece. The limit values for the machining parameters are determined during the machining process to be performed, and new machining parameters for the machining process to be performed are specified by taking these limit values into consideration.

To enable turning-on/off of constant surface speed control during machining. A numerical control device has a constant surface speed control function for controlling a spindle rotation rate to make a surface speed constant, and includes: a surface speed calculating unit for calculating a surface speed based on a spindle rotation speed having been designated and a distance from a rotation center; a cutting speed setting unit for setting a minimum cutting speed and a maximum cutting speed; a comparison unit for comparing the surface speed with the minimum cutting speed and the maximum cutting speed; and an operation control unit for controlling whether to activate the constant surface speed control function based on a result of the comparison made by the comparison unit.

An output device includes: an information acquisition unit which acquires, from a machine learning device that performs machine learning on a servo control device for controlling a servo motor driving the axis of a machine tool, a robot or an industrial machine, a parameter or a first physical quantity of a constituent element of the servo control device that is being learned or has been learned; and an output unit which outputs at least one of any one of the acquired first physical quantity and a second physical quantity determined from the acquired parameter, a time response characteristic of the constituent element of the servo control device and a frequency response characteristic of the constituent element of the servo control device, and the time response characteristic and the frequency response characteristic are determined with the parameter, the first physical quantity or the second physical quantity.

A method for automatic determination of machining parameters for a machining process includes selecting certain machining parameters from stored machining parameters on the basis of predefined conditions for machining a workpiece depending on a position along a machining path, determining limit values for the machining parameters of the machining process to be performed, specifying new machining parameters by taking these limit values into consideration, and guiding a machining head along the machining path over the workpiece with the new machining parameters which take the limit values into consideration. If the limit values are not approached or reached, the machining process is continued using the certain machining parameters as the new machining parameters. If the limit values are approached or reached, the machining process is continued using changed machining parameters as the new machining parameters in order to perform the machining process without violating the limit values.