A wide range of materials are suitable for CNC machining small parts, each offering unique advantages and considerations. Here's a breakdown of some popular options:

l Aluminum: A versatile and cost-effective choice for many small parts. It offers a good strength-to-weight ratio, excellent machinability, and resistance to corrosion. Different aluminum alloys cater to specific needs, like increased strength (7075) or better machinability (6061).

l Brass: Offers good machinability, corrosion resistance, and electrical conductivity. Ideal for small parts requiring a combination of these properties, such as electrical connectors or decorative components.

l Stainless Steel: Provides exceptional strength, durability, and corrosion resistance. Suitable for small parts in harsh environments or requiring high hygiene standards, like medical instruments or food processing equipment. However, machining stainless steel can be more challenging and expensive compared to softer metals.

l Steel: Offers the highest strength and rigidity among these options. Best suited for small parts requiring exceptional load-bearing capacity, but machinability can be more challenging compared to softer metals.

l Acrylonitrile Butadiene Styrene (ABS): A common plastic known for its impact strength, good machinability, and dimensional stability. Suitable for small parts requiring a balance of durability and functionality, like housings or prototypes.

l Acetal (POM): Offers high strength, stiffness, and excellent dimensional stability. Ideal for small parts requiring low friction, wear resistance, and precise tolerances, like gears or bearings.

l Polycarbonate (PC): Provides high impact strength, clarity, and good heat resistance. Suitable for small parts requiring visual transparency or needing to withstand some heat, like lenses or instrument housings.

Discussing your project with a CNC service provider can be very helpful. They can advise on the most suitable material based on your design, functionality, and budget. They can also offer insights into machinability and potential cost implications of different material choices. For more information, please read the article: Precision Machining: Exploring the World of CNC Small Parts Manufacturing.