The optimal cutting speed and feed rate for CNC machining titanium depend on several factors, including:

· Tool type: Carbide tools generally have higher recommended cutting speeds and feeds than HSS tools.

· Workpiece geometry: The shape and size of the workpiece can affect the cutting forces and heat generation.

· Machining operation: Roughing operations typically require lower cutting speeds and feeds than finishing operations.

· Tool condition: A worn or damaged tool may require lower cutting speeds and feeds to prevent premature failure.

As a general guideline, the following cutting speeds and feeds are often recommended for CNC machining titanium:

· Cutting speed: 100-200 feet per minute (fpm)

· Feed rate: 0.005-0.010 inches per revolution (IPR)

It is important to note that these are starting points, and the actual cutting speed and feed rate may need to be adjusted based on the specific machining conditions. Experimentation and monitoring of tool life and workpiece quality are essential for optimizing the machining process.