1. Technical capability: CNC machining is a high-precision process, so the technical capability of the manufacturer is one of the important factors in selection. Manufacturers should have advanced equipment and a professional technical team, able to customize production according to customer needs.

2. Equipment and facilities: CNC processing requires the use of advanced equipment and tools, so the manufacturer's equipment and facilities are also an important factor in the selection. Manufacturers should be equipped with the latest CNC machine tools, cutting tools, and measuring equipment to ensure the accuracy and quality of their products.

3. Experience and reputation: Choosing a manufacturer with rich experience and good reputation can ensure product quality and delivery time. You can evaluate the experience and reputation of manufacturers by reviewing their qualifications and certifications, understanding their past projects, and customer evaluations.

4. Price and cost: Price is one of the important factors to consider when selecting a manufacturer. It is necessary to compare the quotations of different manufacturers, taking into account factors such as price, quality, and delivery time, in order to select manufacturers with higher cost-effectiveness. At the same time, it is also necessary to consider the cost of the product to ensure that the quotation provided by the manufacturer is reasonable.

5. Delivery time: Delivery time is one of the important factors to consider when selecting a manufacturer. We need to communicate with the manufacturer about the production and delivery cycles of the product, and compare them with our own needs to ensure that the manufacturer can deliver the product on time.

6. Service and after-sales support: Good after-sales service and support are one of the factors to consider when choosing a manufacturer. Manufacturers should provide timely technical support and after-sales service to answer customer questions and solve any problems that arise, in order to improve customer satisfaction.

7. Capacity: Understand the production capacity and capacity of manufacturers, and evaluate whether they can meet their own needs. It is necessary to consider factors such as the manufacturer's factory area, number of equipment, number of employees, and whether there is a risk of overload production.

8. Quality Management System: Manufacturers should have a comprehensive quality management system to ensure product quality and meet customer requirements. You can check the manufacturer's quality certification and system documents to understand the operation of their quality management system.

9. Supply chain management: Supply chain management is one of the factors that needs to be considered when selecting manufacturers. Manufacturers should have good supply chain management capabilities and be able to timely purchase and manage raw materials to ensure smooth production.

10. Sustainable development: Choosing manufacturers with sustainable development awareness can bring more value to customers. For example, choosing manufacturers that focus on environmental protection, energy conservation, and emission reduction can reduce their impact on the environment and improve their corporate image.

In summary, when selecting CNC processing manufacturers, it is necessary to comprehensively consider factors such as technical capabilities, equipment and facilities, experience and reputation, price and cost, delivery time, service and after-sales support, capacity, quality management system, supply chain management, and sustainable development. By comprehensively considering these factors and selecting a suitable manufacturer, it is possible to ensure product quality, delivery time, and meet one's own needs.