In five-axis machining, the choice of tools is more critical. Specialized end mills with extended reach and rigidity are often required to access complex geometries without causing vibrations or deflections. Ball nose end mills are commonly used for contouring and finishing operations due to their ability to create smooth surfaces. Additionally, the tool’s length and diameter need to be carefully selected to avoid collisions with the workpiece or machine components during the multi-axis movements. Tool holders also play an important role in maintaining tool stability and accuracy.