There are some CNC machining considerations for anodized parts：

Tooling: Anodized layers can be harder than the underlying aluminum. Using sharp, carbide cutting tools specifically designed for machining hard materials is crucial to prevent excessive tool wear and maintain accuracy. Tools with appropriate geometries and coatings can help improve cutting performance and tool life.

Coolant Selection: Adequate coolant selection is essential to manage the heat generated during machining. Coolants should be compatible with the anodized layer and effectively dissipate heat to prevent tool wear, workpiece distortion, and surface damage.

Feed Rates and Speeds: Optimized feed rates and speeds are critical for efficient and effective machining. Higher speeds and feeds can lead to increased heat generation and potential damage to the anodized layer. Careful consideration of these parameters is necessary to achieve the desired surface finish and part accuracy.

Workholding: Secure workholding is crucial to prevent part movement during machining. The workholding method should minimize the risk of damaging the anodized layer. Fixtures and clamps should be designed to distribute clamping forces evenly and avoid localized pressure points.

Post-Machining Handling: Careful handling of the parts after machining is essential to prevent damage to the anodized layer. Avoid sharp impacts, excessive friction, or contact with abrasive materials that could scratch or mar the surface.