A program-controlled milling and drilling machine, comprising - a processing unit which is movable in a plurality of coordinate axes by means of a motor and in which a work spindle for the exchangeable accommodation of a cutting tool and an e-motor as a drive for the work spindle are installed, - a programmable control unit and - a device for monitoring the operating condition of the machine tool which includes - at least one sensor system (20, 21) for detecting at least one operating parameter at a component (11, 38) of the machine tool, said component being relevant for this parameter, - an evaluating unit which is connected to the sensor system (20, 21) and also to the control unit and which processes the measured values detected by the sensor system (20, 21), and - an optical display (28, 40) which according to the data from the evaluating unit indicates a normal operating condition, a critical operating condition and a dangerous operating condition for the machine tool, wherein - the optical display contains a display element (28,40), - the display element (28, 40) contains, depending on the operating condition, changing color ranges, i.e. green for the normal operating condition, yellow/orange for the critical operating condition and red for the dangerous operating condition, characterized in that - the display element (28, 40) is arranged in an ergonomically advantageous position in the direct viewing area of an operator externally on a side wall of the processing unit, - the display element (28, 40) contains a plurality of light fixtures which are arranged in a transparent housing capsule and are electrically connected to the evaluating unit and/or to the control unit, and - wherein, of the entire color area of the display element (28, 40), the green area adopts about 60 to 70 %, the yellow/orange area 20 to 30 % and the red area 10 to 20 %, and - wherein the relative size of the respectively active color range indicates the actual size of the monitored operating parameter. - a processing unit which is movable in a plurality of coordinate axes by means of a motor and in which a work spindle for the exchangeable accommodation of a cutting tool and an e-motor as a drive for the work spindle are installed, - a programmable control unit and - a device for monitoring the operating condition of the machine tool which includes - at least one sensor system (20, 21) for detecting at least one operating parameter at a component (11, 38) of the machine tool, said component being relevant for this parameter, - an evaluating unit which is connected to the sensor system (20, 21) and also to the control unit and which processes the measured values detected by the sensor system (20, 21), and - an optical display (28, 40) which according to the data from the evaluating unit indicates a normal operating condition, a critical operating condition and a dangerous operating condition for the machine tool, wherein - the optical display contains a display element (28,40), - the display element (28, 40) contains, depending on the operating condition, changing color ranges, i.e. green for the normal operating condition, yellow/orange for the critical operating condition and red for the dangerous operating condition, characterized in that - the display element (28, 40) is arranged in an ergonomically advantageous position in the direct viewing area of an operator externally on a side wall of the processing unit, - the display element (28, 40) contains a plurality of light fixtures which are arranged in a transparent housing capsule and are electrically connected to the evaluating unit and/or to the control unit, and - wherein, of the entire color area of the display element (28, 40), the green area adopts about 60 to 70 %, the yellow/orange area 20 to 30 % and the red area 10 to 20 %, and - wherein the relative size of the respectively active color range indicates the actual size of the monitored operating parameter.