The most suitable aluminum alloys for CNC turning are those that are machinable, robust, and corrosion-resistant. The most widely used aluminum alloys for CNC turning include:

• 6061: The machinability, strength, and corrosion resistance of this alloy are well known. It is frequently employed for a number of purposes, such as structural, electrical, and automotive components.
• 7075:The extreme strength and hardness of this alloy are well recognized. It is frequently used for things like aircraft parts and military gear where the highest levels of toughness and durability are necessary.
• 2024:The outstanding strength and hardness of this alloy are well known. It is frequently utilized in situations where great strength is required, such as in automobile and aviation parts.
• 5052: This alloy is renowned for its superb machinability and resistance to corrosion. It may be very easily welded. It is not as robust as 6061 or 7075, though.

It is significant to remember that not every aluminum alloy is the same. While some alloys are more prone to corrosion than others, some alloys are more challenging to machine. It is crucial to select an alloy that is appropriate for the application's unique requirements. It is best to seek advice from an experienced engineer or machinist if you are unclear about which aluminum alloy is ideal for your CNC turning needs.