Abstract: The invention relates to a compressed gas-operated apparatus, which comprises a tool unit and a receiving unit for accommodating the tool unit, wherein the tool unit comprises a stator and a rotor that is rotatingly drivable about a rotational axis relative to the stator while being applied with compressed gas, wherein the tool unit is deflectable relative to the receiving unit from a starting position that is predeterminable by means of the receiving unit into one or more deflection positions. In order to provide a compressed gas-operated apparatus of that type, with which an increased process security can be ensured, it is proposed in accordance with the invention that the apparatus comprises a sensor device for determining a deflection state of the tool unit relative to the receiving unit. The invention also relates to a compressed gas machining system.