VR Lathe Machine is a 3D Simulation training using Virtual Reality (VR) technology that has 3 menus. Students will use this simulation to learn about the machine's components and how the basic work functions. The usability of the simulation system must be tested before this application can be used as assist in learning system. In this study, usability testing is used to assess the value of usability in a design that has gone through trial and error by the development team. PSSUQ (Post-Study System Usability Questionnaire) item questionnaire was used as the method for evaluate the application. The final results were 2.23 for the overall subscale, which was in the good category, 2.2 for System Usefulness and information quality, and 2.4 for interface quality. This suggests that there is still room for improvement in terms of the simulation's user feedback design system, additional features such as air cooling, dynamic interfaces, and lowering the sensitivity of the wheels that involve immersive real-time rotation.