The machine used to make a hole more precise is called:

The machine that is specifically used to make a hole more precise is referred to as a finish boring machine. This type of machine is designed to refine the dimensions of holes that have already been drilled or cast, ensuring that they achieve a high level of accuracy and smoothness. Finish boring typically involves removing a small amount of material from the walls of a pre-existing hole, which enhances its tolerances and provides a better fit for the parts that will be assembled.

Boring machines can also be utilized to reach exact specifications for various applications, which is crucial in industries where precision is paramount. This precision is particularly important in mechanical assemblies where parts need to fit perfectly to function as intended.

In contrast, while drilling machines are primarily used for creating holes in materials, they may not achieve the same level of precision as finish boring. Routers are typically used for shaping and hollowing out pieces of wood or plastic rather than making holes. Lathes are versatile tools used for shaping materials, but their primary function is not to create precise holes but to rotate the material against a cutting tool.