When choosing a manufacturer for CNC machined aluminum alloy parts, there are several factors to consider:

Experience: Look for a manufacturer that has a track record of producing high-quality CNC machined aluminum alloy parts for a variety of applications. This will give you confidence in their ability to produce parts that meet your specific requirements.
Capabilities: Make sure the manufacturer has the necessary equipment and expertise to produce the parts to the required specifications and tolerances. This may involve checking the manufacturer’s capabilities in terms of the types of aluminum alloys they can work with, the sizes and shapes of parts they can produce, and the level of precision they can achieve.
Quality control: Choose a manufacturer that has a robust quality control process in place to ensure that the parts meet the required standards. This may involve inspecting the parts for defects or imperfections, and performing tests to ensure that they meet the required performance criteria.
Lead time and delivery: Consider the manufacturer’s lead time and delivery capabilities to ensure that you receive the parts in a timely manner. This is especially important if you have a tight deadline or need the parts on a regular basis.
Cost: Compare prices from several different manufacturers to find the best value for your money. Keep in mind that the lowest price may not always be the best option, as it may reflect lower quality or less reliable service.

Overall, it is important to do thorough research and choose a reputable and reliable manufacturer to ensure that you are getting high-quality CNC machined aluminum alloy parts.