Method for process monitoring of a rotating machining unit, drivable by an electric motor, for machining a component, said electric motor being formed with a motor controller comprising a detection module detecting the current consumption of the electric motor for determining the respective current torque of the electric motor, comprising the following steps: a. Detection of the actual values of the current consumption (I Ist) of the electric motor corresponding to torque generation by means of the detection module; b. Comparing the respective detected actual value (I Ist) with stored target values (I min, I max) of a target value range (I soll), the target value range (I sοll) being determined in a teach mode by means of a multiplicity N of current consumption (I Ist) of the electric motor was previously detected by the detection module of the motor control during machining with the machining unit on such a component and the mean value (I M) was determined therefrom, and a component-specific standard deviation σ is determined in order to calculate the lower and upper limit value (I min) respectively (I max) of the target value range (I soll) of the current consumption of the machining unit; c. Determining whether the actual value (I Ist) of the current consumption is a permissible value from the target value range (I soll) and d. Outputting of a signal if the actual value is not a permissible value from the target value range, in order to thereby detect a torque deviation of the rotating machining tool, wherein, in the event of a deviation, a corresponding signal is transmitted to an error counter and, if a predefined number of deviations detected by the error counter is exceeded, a switch-off unit interrupts machining with the machining tool or switches off the electric motor. a. Detection of the actual values of the current consumption (I Ist) of the electric motor corresponding to torque generation by means of the detection module; b. Comparing the respective detected actual value (I Ist) with stored target values (I min, I max) of a target value range (I soll), the target value range (I sοll) being determined in a teach mode by means of a multiplicity N of current consumption (I Ist) of the electric motor was previously detected by the detection module of the motor control during machining with the machining unit on such a component and the mean value (I M) was determined therefrom, and a component-specific standard deviation σ is determined in order to calculate the lower and upper limit value (I min) respectively (I max) of the target value range (I soll) of the current consumption of the machining unit; c. Determining whether the actual value (I Ist) of the current consumption is a permissible value from the target value range (I soll) and d. Outputting of a signal if the actual value is not a permissible value from the target value range, in order to thereby detect a torque deviation of the rotating machining tool, wherein, in the event of a deviation, a corresponding signal is transmitted to an error counter and, if a predefined number of deviations detected by the error counter is exceeded, a switch-off unit interrupts machining with the machining tool or switches off the electric motor.