Despite its many advantages of CNC machining titanium, machining titanium presents unique challenges due to its properties:

· Hardness: Titanium is a relatively hard material, which can lead to increased tool wear and reduced tool life.

· Work-hardening tendencies: Titanium's work-hardening properties can cause the material to become harder and more difficult to machine as it is cut. This can lead to tool breakage and dimensional inaccuracies.

· Chip welding: Titanium chips can weld to the cutting tool, causing tool breakage and poor surface finishes. This can be particularly problematic when machining deep pockets or blind holes.

· Tool wear: The combination of hardness and work-hardening can lead to rapid tool wear, requiring frequent tool changes and increased downtime.

· Cost: Titanium is generally more expensive than other metals, which can increase the overall cost of machined parts.

To overcome these challenges, it is essential to use specialized tools, proper cutting parameters, and adequate coolant flow when machining titanium.