In the description of "855 vertical machine tool high-precision machining center", "855" refers to a specific model or specification of machine tool. The following are some of the features and functions that a vertical machine tool high-precision machining center may have under normal circumstances:

1. CNC system: Using advanced CNC system, each axis of the machine tool can be controlled through programs to achieve high-precision processing.

2. High-precision guide rail: Equipped with a high-precision guide rail system to ensure the stability and accuracy of the machine tool during movement.

3. Spindle: High-precision spindle usually has higher rotation speed and power to adapt to different processing needs and ensure high-precision cutting.

4. Tool changing system: The automatic tool changing system allows the automatic replacement of different types or sizes of tools during the processing process to improve production efficiency.

5. Workbench: Stable workbench design is suitable for various workpiece clamping methods and ensures high-precision processing.

6. Cooling system: Equipped with a cooling system to cool the cutting area, improve tool life, and ensure stability during processing.

7. High-speed positioning: The fast and accurate positioning system enables the machine tool to achieve high-precision workpiece positioning in a short time.

8. High-resolution position measurement system: used to monitor the position of each axis of the machine tool in real time to ensure high accuracy and repeatability during the machining process.

9. Flexible processing capabilities: Able to adapt to various processing needs, including milling, drilling, tapping and other processing operations.

10. User interface: It has an intuitive user interface, allowing operators to easily set processing parameters and monitor the processing process.

These high-precision machining centers are usually used in industries that require high parts accuracy, such as mold manufacturing, aerospace, machinery industries, etc.