Machine tool for processing a workpiece that has a temperature which deviates from a pre-defined processing temperature, the machine tool comprising - a base to position the workpiece on; - at least one processing means for processing the workpiece; - one or more actuators for moving the processing means relative to the base; - a control unit for controlling the actuators, the control unit comprising a data storage for storing machine parameters of the machine tool and nominal data (26, 27) of the workpiece, the nominal data comprising nominal dimension data providing nominal dimensions of the workpiece at the pre-defined processing temperature; and - at least one temperature sensor that is configured to determine one or more actual temperature values of the workpiece, particularly an actual temperature distribution on at least a part of the workpiece, wherein - the at least one temperature sensor is configured to generate temperature data based on the determined actual temperature values and to provide the temperature data to the control unit; - the control unit is configured to calculate actual dimensions of the workpiece based on the nominal dimension data and on the provided temperature data; and - the control unit is configured to control the actuators to process the workpiece according to the calculated actual dimensions, characterized by - one or more fixations configured to fix a position and orientation of the workpiece on the base; and - at least one additional temperature sensor that is configured to determine one or more actual temperature values of the one or more fixations and/or of one or more specific points at or near the one or more fixations, wherein - the additional temperature sensor is configured to generate machine temperature data based on the one or more determined actual temperature values of the one or more fixations and/or of the one or more specific points and to provide the machine temperature data to the control unit; - the machine parameters comprise information about the fixations; - the nominal data comprises one or more expansion coefficients of the workpiece; and - the control unit is configured to calculate the actual dimensions of the workpiece also based on the expansion coefficients of the workpiece, on the machine temperature data and on the information about the fixations. - a base to position the workpiece on; - at least one processing means for processing the workpiece; - one or more actuators for moving the processing means relative to the base; - a control unit for controlling the actuators, the control unit comprising a data storage for storing machine parameters of the machine tool and nominal data (26, 27) of the workpiece, the nominal data comprising nominal dimension data providing nominal dimensions of the workpiece at the pre-defined processing temperature; and - at least one temperature sensor that is configured to determine one or more actual temperature values of the workpiece, particularly an actual temperature distribution on at least a part of the workpiece, - the at least one temperature sensor is configured to generate temperature data based on the determined actual temperature values and to provide the temperature data to the control unit; - the control unit is configured to calculate actual dimensions of the workpiece based on the nominal dimension data and on the provided temperature data; and - the control unit is configured to control the actuators to process the workpiece according to the calculated actual dimensions, - one or more fixations configured to fix a position and orientation of the workpiece on the base; and - at least one additional temperature sensor that is configured to determine one or more actual temperature values of the one or more fixations and/or of one or more specific points at or near the one or more fixations, - the additional temperature sensor is configured to generate machine temperature data based on the one or more determined actual temperature values of the one or more fixations and/or of the one or more specific points and to provide the machine temperature data to the control unit; - the machine parameters comprise information about the fixations; - the nominal data comprises one or more expansion coefficients of the workpiece; and - the control unit is configured to calculate the actual dimensions of the workpiece also based on the expansion coefficients of the workpiece, on the machine temperature data and on the information about the fixations.