The present invention relates to a control device 200 for use on a numerically controlled machine tool 100, comprising a machine control unit 230 for controlling actuators of the machine tool for a machining process for a workpiece to be performed on the machine tool 100, in particular on the basis of control data, and a monitoring unit 250 for monitoring an operating state of the machine tool 100. In accordance with the invention, the monitoring unit 250 has a computer-implemented neural network 253 (NN), which in particular is designed to read input data from the machine control unit 230 and to output output data specifying an operating state of the machine tool 100.

A diagnostic apparatus includes: a receiver to receive, from a diagnosis target device, context information corresponding to a current operation on the target device and tool information regarding a tool being used for the current operation on the target device, the context information corresponding to the current operation being one of a plurality of items of context information that have been determined by respective types of a plurality of types of operation applicable to the target device; and circuitry to obtain detection information of a physical quantity varying with the current operation on the target device, and to determine a level of degradation of the tool being used, using the detection information and a model corresponding to a combination of the received context information and the received tool information, the model being specified from one or more models respectively corresponding to available combinations of context information and tool information using the received combination of context information and tool information.

A diagnostic apparatus includes: a receiver to receive, from a diagnosis target device, context information corresponding to a current operation on the target device and tool information regarding a tool being used for the current operation on the target device, the context information corresponding to the current operation being one of a plurality of items of context information that have been determined by respective types of a plurality of types of operation applicable to the target device; and circuitry to obtain detection information of a physical quantity varying with the current operation on the target device, and to determine a level of degradation of the tool being used, using the detection information and a model corresponding to a combination of the received context information and the received tool information, the model being specified from one or more models respectively corresponding to available combinations of context information and tool information using the received combination of context information and tool information.