For machining centers that are simple to operate and fully functional, they usually have the following characteristics:

1. User-friendly interface: The machining center should be equipped with an intuitive and easy-to-understand user interface so that operators can quickly get started. This may include touch screen control, intuitive graphical interface, and easy-to-understand menu structure.

2. Simplified operation process: The machining center should design a simplified operation process to minimize manual intervention and complex setup steps. This can be achieved through functions such as preset machining programs, automated tool switching, and workpiece clamping.

3. Automation function: In order to improve production efficiency and reduce human errors, machining centers usually integrate various automation functions. This may include automatic tool switching, automatic workpiece clamping, automatic measurement and compensation, etc.

4. Comprehensive processing capabilities: A fully functional machining center should be able to perform a variety of machining operations, including milling, drilling, tapping, turning, etc. The machining center can meet the processing needs of different types of parts.

5. High precision and stability: The machining center should have high precision and stability to ensure the quality and dimensional accuracy of the machined parts. This may include a high-precision transmission system, a stable machine tool structure, and a sophisticated control system.

6. Fault diagnosis and maintenance functions: In order to ensure continuous production, the machining center should be equipped with complete fault diagnosis and maintenance functions. This may include automatic fault alarm, remote monitoring and maintenance prompts, etc.

7. Safety measures: In order to ensure the safety of operators, the machining center should be equipped with complete safety measures, including emergency stop buttons, safety shields, safety door locks, etc.

In general, a simple and fully functional machining center should have an intuitive and easy-to-understand interface, simplified operating procedures, automation functions, comprehensive machining capabilities, high precision and stability, fault diagnosis and maintenance functions, and safety measures to meet user needs and improve production efficiency.