The selection of ball screws for CNC vertical lathes has the following key advantages:

1. High precision: Ball screws can provide highly accurate motion control with low rotational clearance and high reverse precision. This enables CNC vertical lathes to achieve higher processing accuracy and surface quality during processing.

2. High rigidity: Ball screws have high rigidity during motion and can resist the loads generated by cutting forces and vibrations. This high rigidity can improve the stability of the machine tool and reduce deformation, thereby enhancing the stability and reliability of processing.

3. High efficiency: Ball screws have a lower rolling friction coefficient and can provide higher transmission efficiency. Compared with threaded screws, ball screws can provide greater axial loads and speeds at the same input power, thereby improving the processing efficiency of machine tools.

4. Long life: Ball screws use rolling to transmit motion, which has lower wear and friction than sliding screws. This makes the ball screw have a longer service life, reduces the frequency of maintenance and replacement, and improves the reliability and durability of machine tools.

In general, the key to choosing a ball screw is that it can provide a high-precision, high-rigidity, high-efficiency and long-life motion transmission method to meet the requirements of CNC vertical lathes for accuracy and stability, thereby improving processing quality and production efficiency. However, the selection of a ball screw also needs to consider factors such as its cost, structural limitations and maintenance costs.