Abstract: A monitoring module comprises a tool interface for holding the tool and a tool holding interface for insertion into a tool holder. The monitoring module has a sensor unit, whereby the axis of rotation of the monitoring module runs through the sensor unit. The sensor unit detects a variable representative of an acceleration in a plane normal to the axis of rotation of the monitoring module when the monitoring module rotates together with the tool/tool holder. A computing unit of the monitoring module receives the variables representative of the acceleration recorded by the sensor unit, determines a total acceleration from this, compares the total acceleration with a threshold value and determines that there is a concentricity error of the tool to be rotated, the monitoring module and/or the tool holder if the total acceleration is greater than the threshold value.

Abstract: A processing unit for measuring and controlling a rotary-driven tool, wherein the processing unit is connectable to a light barrier arrangement, which comprises a light-transmitting unit and a light-receiving unit, wherein the processing unit is configured to receive from the light-receiving unit signals that are at least approximately proportional to shading generated by the rotary-driven tool and/or at least one cutting edge of the rotary-driven tool at a first measuring position. The processing unit is further configured to evaluate the signals received and to transmit control signals to the light barrier arrangement, wherein the evaluation of the signals received by the processing unit comprises the following steps: determination of an interference signal component and/or a useful signal component of the received signal; and provision of information about the useful signal component, the interference signal component and/or the received signal for forwarding to a numerical controller of a machine tool.

Abstract: A processing unit for measuring and controlling a rotary-driven tool, wherein the processing unit is connectable to a light barrier arrangement, which comprises a light-transmitting unit and a light-receiving unit, wherein the processing unit is configured to receive from the light-receiving unit signals that are at least approximately proportional to shading generated by the rotary-driven tool and/or at least one cutting edge of the rotary-driven tool at a first measuring position. The processing unit is further configured to evaluate the signals received and to transmit control signals to the light barrier arrangement, wherein the evaluation of the signals received by the processing unit comprises the following steps: determination of an interference signal component and/or a useful signal component of the received signal; and provision of information about the useful signal component, the interference signal component and/or the received signal for forwarding to a numerical controller of a machine tool.