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AI Overview
The best aluminum alloys for CNC-machined mounting parts are 6061-T6 for general-purpose, high-versatility use and 7075-T6 for high-strength, demanding, or aerospace-grade applications. These alloys offer excellent machinability while balancing strength, rigidity, and corrosion resistance. 
Top Aluminum Alloys for CNC Mounting 
  • 6061-T6 (Most Common): The "go-to" alloy for most mounting parts due to its reasonable cost, high strength, good weldability, and excellent machining properties. 
  • 7075-T6 (High Strength): Used when maximum strength is required, similar to some steels but at a lower weight. It is more expensive but ideal for high-stress fixtures or aerospace components. 
  • 6082-T6 (Alternative): Popular in Europe as a substitute for 6061, offering slightly better strength. 
  • 6063-T5 (Extrusion): Often used for standard T-slot extrusions and linear rails for CNC structures. 
Key Factors for Selection 
  1. Strength and Rigidity: For high-load structural mounting, 7075-T6 provides the best strength.
  2. Machinability: 6061-T6 is less "gummy" and machines easily, producing clean edges.
  3. Cost: 6061 is significantly cheaper and more widely available than 7075.
  4. Corrosion Resistance: Both 6061 and 7075 show good resistance, particularly if anodized.
  5. Finish: 7075 provides superior surface finishes during high-speed machining. 
Why These Alloys? 
  • Anodized Finish: Most, such as 6063-T5 used in t-slots, come anodized for added wear and corrosion resistance.
  • Machine-Ready: 6061-T651 and 7075-T651 plates can be purchased as precision ground or milled to close tolerances, reducing setup time.
  • High-Speed Processing: These alloys allow for fast machining, resulting in lower costs and less tool wear compared to steel. 
For standard DIY or light-duty mounting, 6061-T6 is usually the best choice, but 7075-T6 is preferred when failure cannot be an option or when designing heavy-load mounting structures. 
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