Vertical machining centers are usually designed with high positioning accuracy to meet the processing needs of high precision parts. The following are some of the characteristics that may result in high positioning accuracy of vertical machining centers:

1. Rigid machine tool structure: Vertical machining centers usually adopt a solid machine tool structure, including components such as bed, columns and beams, to ensure a high degree of machine tool rigidity. This helps reduce vibration and deformation and improve processing positioning accuracy.

2. High-precision guide rails: Use high-precision linear guide rails, ball screws and other components to reduce friction and gaps during movement and improve the accuracy of axial positioning.

3. Precision spindle: Vertical machining centers are usually equipped with high-precision and high-rigidity spindles to ensure that the tool can move stably when rotating at high speed and improve cutting accuracy.

4. Precision servo system: Equipped with high-precision servo motors and control systems to ensure that the movement of each axis can accurately track the instructions in the CNC program and achieve high-precision position control.

5. Advanced CNC system: Use advanced CNC system to support advanced interpolation algorithms and motion control strategies to achieve more precise positioning control.

6. Temperature compensation system: Some high-precision vertical machining centers may be equipped with a temperature compensation system to reduce the impact of temperature changes on the accuracy of the machine tool.

7. Automated correction function: Some advanced vertical machining centers may have automated positioning error correction functions, which can improve processing positioning accuracy by measuring and compensating system errors.

8. High-resolution position feedback system: Use high-resolution position sensors and encoders to provide more accurate position feedback, helping to achieve high-precision positioning.

The combination of these features allows the vertical machining center to maintain a high level of positioning accuracy when processing precision parts, ensuring that parts that meet the design requirements are processed.