The extraction and use of machine tool data has been described theoretically in the literature for decades. Nevertheless, the use for an increased productivity is still constrictive. However, current Industry 4.0 Communication methods are defined as OPC-UA, MQTT, or REST. These communication standards can integrate machine tool and process data in IoT-Clouds or external devices. As part of a comprehensive machining data acquisition, specific variables and parameters are not recognized in most cases. Transferring user-individual data via Open-Source applications from machine tools to end devices is only possible with high effort. This paper describes the workflow for the acquisition of user-defined data of a machine tool via the Open-Source-Stack open62541 for OPC-UA.