Final answer:
A Universal-type milling machine includes a fourth movement that enables the cutting of helical shapes, adding exceptional versatility to the machine's capabilities.
Step-by-step explanation:
A Universal-type milling machine is similar to the above machine but a fourth movement has been added to the worktable to permit cutting helical shapes, such as the threads on a screw or gear teeth. This type of milling machine is extremely versatile because it provides the necessary movements to allow for the milling of spirals and helices, which would be difficult or impossible to achieve with other types of milling machines.
The Universal milling machine allows for both vertical and horizontal milling operations and typically features a rotating table that can be adjusted to various angles for helical work. Its flexibility in movement and the variety of attachments available for it make this type of machine a valuable tool in precision metalworking.