The invention relates to a
machine tool having a
machine body and a tool, wherein an ultrasonic
transducer comprising a stacked arrangement of
piezoelectric actuators is arranged on a tool side of the
machine tool; the
machine tool comprises a drive
transformer for supplying the ultrasonic
transducer with an energy
signal, said drive
transformer comprising a primary drive coil, which is arranged on the machine body side and is connected to an alternating
signal supply device, and a secondary drive coil, which is arranged on the tool side, is separated from the primary drive coil by a first air gap and is connected to the ultrasonic
transducer; the
machine tool comprises a measuring device comprising at least one
piezoelectric sensor arranged on or in a
tool holder of the
machine tool; wherein the measuring device is connected to a
signal transmission device for contactless transmission of a measurement signal from the measuring device to a signal detection device on the machine body side, said signal transmission device comprising signal transmission elements having a second air gap located therebetween and spaced apart from the first air gap. According to the invention, the signal detection device is a
voltage measuring device, wherein the at least one
piezoelectric sensor is integrated in a measuring circuit comprising the signal transmission device and at least one measuring
capacitor connected in parallel with the at least one
piezoelectric sensor on the tool side and / or in parallel with the
voltage measuring device on the machine body side.