CNC drilling machines and CNC milling machines are crucial equipment used in PCB processing. These machines come with a high price tag and their selection is pivotal not only for operation, process setting and maintenance, but also for the quality of the products produced. As a craftsman, the selection indicators for CNC machine tools typically begin by considering the following aspects:

1. Rigidity and Stability of the Machine Table: The machine tool should have sufficient stability and rigidity to avoid vibration. Many manufacturers use marble or steel as the material for the bed, with some Japanese manufacturers opting for steel. It is recommended to use equipment with a marble bed, and daily maintenance should involve cleaning the marble with detergent and water, followed by drying it with a dry cloth.
2. Speed and Stability of the Shaft: There are two types of rotating shafts currently available, including rolling bearings with a maximum speed of 80,000 rpm and air bearings with a maximum speed of 120,000 rpm. It is recommended to use rolling bearings for milling machines. The presser foot of the rotating shaft should also be considered, as its life and design can impact the overall performance.
3. Movement Accuracy and Displacement Repeatability of the Tabletop: This is a crucial factor that can only be certified after testing post-purchase. The accuracy of the machine tools, particularly after running for one to two years, is a key consideration.
4. Feed Rate of X, Y, Z Axis: The feed rate generally uses a screw stepping motor, with newer products adopting a servo motor for a higher feed rate and increased production capacity.
5. Moving and Fixing Device of the Table: The guide rails or air flotation are primarily used as the load-bearing of the tabletop. Air flotation tables are recommended for flexible movement and convenient maintenance. Additionally, the design of the chuck used for fixing the circuit board on the table is crucial, as it impacts the replacement and maintenance requirements of the equipment in the future.
   Overall, the selection of CNC machine tools requires careful consideration of these factors to ensure optimal performance and longevity.