The MDM-4 (Multi-Degree-of-Freedom Machine) application field and its working principle are two areas of study which have recently grown in popularity in academic and industrial settings. It is a type of multi-axis parallel machine, meaning that it has multiple movable axes of motion, which can be programmed to move independently and at varying speeds and directions. The MDM-4 provides a robust platform for the development of innovative robotic applications, as it is capable of performing a wide range of process tasks and allows for a high degree of flexibility.The major application areas of the MDM-4 are as follows:1. Inspection: The MDM-4 can be used for examining the condition and state of various objects of interest including industrial products, natural phenomena, and living tissues. This can be done through a variety of imaging techniques and measurement tools, such as machine vision, 3D scanning, and coordinate measurement machines (CMMs).2. Assembly: The MDM-4 can be used for a variety of assembly tasks such as picking and placing components accurately while minimising errors and increasing throughput.3. Grinding/Cutting: The MDM-4 is well suited for grinding and cutting operations due to its ability to accurately control the position and orientation of various tools.4. Forming/Welding: The MDM-4 is also suitable for various forming and welding operations such as arc welding, laser welding, and resistance and arc welding.5. Milling/Lathe Machining: The MDM-4 is also well suited for milling and lathe machining operations, as its design enables a high degree of accuracy and flexibility.Now that we have discussed the various application fields of the MDM-4, let us look at the underlying principle.The MDM-4 is a parallel machine, which is composed of multiple modules which are each capable of moving independently. The MDM-4 is driven by a number of servomotors which are each responsible for controlling the motion of one or more of the modules. The servomotors convert the electrical signals delivered by the control system into mechanical motion. The independent movement of the modules is made possible by a set of kinematic constraints which are encoded in the control system. The kinematic constraints allow the control system to precisely control the position and orientation of the various movable axes.The MDM-4 can be programmed to perform a variety of tasks, such as inspection, assembly, grinding/cutting, forming/welding, and milling/lathe machining tasks. It is also capable of performing tactile sensing operations as well as generating force-based feedback.In conclusion, we have discussed the various application fields and working principles of the MDM-4. It is a powerful and versatile robotic platform which can be used for a variety of industrial applications. The MDM-4 provides a high degree of accuracy and flexibility, and can be programmed for a wide range of process tasks.