CNC machining small parts can present several challenges due to the precision and accuracy required for their manufacture. Some of these challenges include: 1. Maintaining dimensional accuracy: Small parts require tight tolerances and high accuracy, which can be challenging to achieve due to the complexity and small size of the parts. 2. Tool selection and durability: The selection and durability of cutting tools become critical for small parts to avoid tool wear and breakage that can affect the quality of the finished parts. 3. Workholding: Holding small parts securely and accurately during machining is challenging as there is limited space to clamp the parts and ensure they don't move or shift. 4. Chip management: With limited space for chips to exit the machining area, chip buildup can be an issue, leading to tool wear, cutting edge damage, and surface finish issues. 5. Programming complexity: Small parts may require complex and intricate programming to achieve the desired geometries and features, which can be challenging to achieve with high accuracy and repeatability.