During the machining of the Swiss - type lathe, the use of cutting fluid can improve the machining quality, prolong the tool life, and reduce the machining temperature, etc. Select appropriate cutting fluid according to the workpiece material and machining requirements, and ensure sufficient supply of cutting fluid and uniform heat dissipation. During operation, attention should be paid to key points such as preparation before operation, setting of machining parameters, monitoring of the machining process, and inspection after machining. Only by strictly complying with the machining requirements and operation key points can the machining quality and efficiency be ensured.