Process for operating a virtual sensor for determining the condition of a tool holder on a tool machine; virtual sensor for determining the condition of a tool holder and tool machine

A process for operating a virtual sensor for determining the condition of a tool holder on a tool machine and the condition of a tool machine which has at least one tool holder and at least one tool, attached or attachable to the tool holder, which allows a workpiece to be processed by running a machine program, and which has at least one control unit comprising at least one sensor using the following steps:

• recording at least one, in particular time-dependent, piece of body data of the workpiece, the tool, the tool holder, and/or at least one drive axle;
• recording at least one piece of time-dependent room data of the workpiece, the tool, the tool holder, and/or at least one drive axle;
• recording at least one piece of time-dependent operating data, and/or
• recording a least one electrical current of the tool holder and/or of at least one drive axle;
• recording the time-dependent real total energy intake of one or more steps in the machine program using a least one of the control unit's sensors, and calculating the time-dependent, virtual total energy intake of one or more steps using a virtual simulation of the machine program with the control unit based on the body data, room data, and operating data recorded;
• and
• recording or calculating radial forces acting on the tool holder, at least as the difference between time-dependent real total energy intake and time-dependent virtual total energy intake with the control unit.