What type of machine uses a multi-point cutting tool to shape and finish the interior of a hole?

A broaching machine is specifically designed to shape and finish the interior of a hole using a multi-point cutting tool known as a broach. This tool has multiple teeth, each cutting a small amount of material as it is pulled or pushed through the workpiece. The unique design of broaches allows them to create complex internal shapes and features with high precision and efficiency.

Broaching is particularly effective for producing features such as keyways, splines, and various internal profiles that would be difficult or time-consuming to achieve with single-point cutting tools. In addition, broaching can remove material quickly and is often used in mass production settings due to its ability to maintain tight tolerances and repeatability.

While drilling machines also utilize a multi-point cutting tool (the drill bit) to remove material and create holes, they are primarily focused on creating holes rather than finishing the interior surfaces or shapes. Milling machines can perform a wide variety of cutting tasks and can also create internal features but typically do not use multi-point tools designed specifically for that purpose. Lathes, on the other hand, primarily use single-point cutting tools and are focused on shapes created through rotary motion, making them less suitable for shaping the interior of holes compared to broaching machines.