For turning large roll parts, a CNC Lathe machine would likely be the best option. A CNC lathe machine is a type of machine that is specifically designed for turning, drilling, and threading cylindrical parts. They are suitable for producing large roll parts such as spindles, shafts, and drums.

Some features of a CNC Lathe machine that would be useful for turning large roll parts include:

• Large Swing: CNC Lathe machines typically have a large swing capacity which allows them to accommodate large roll parts.
• High torque: CNC Lathe machines are designed to have high torque which is important for turning large roll parts.
• High rigidity: CNC Lathe machines are designed to be extremely rigid, ensuring precision and accuracy even when machining large, heavy parts.
• High power spindle: CNC Lathe machines typically have high power spindles that can handle large cutting tools and provide high cutting speeds.
• Automation: CNC Lathe machines can be automated for large part production, which can be useful for turning large roll parts in a factory setting

It’s important to consult with a CNC machine expert or vendor to determine which type of CNC lathe machine would be best for your specific application. They can help you evaluate the specific needs of your manufacturing process and recommend the most appropriate machine to meet those needs.