What is the main advantage of using finishing teeth on a broach?

The use of finishing teeth on a broach is primarily intended to ensure precise finishing cuts. These teeth are designed to remove a minimal amount of material to achieve tight tolerances and a smooth surface finish on the workpiece. When precision is crucial, finishing teeth help achieve the desired dimensions and surface quality by creating a finer and more accurate cut compared to roughing teeth, which remove larger amounts of metal at a faster rate.

In contrast, roughing teeth are focused on material removal efficiency rather than precision, which might lead to a rough surface. Sharpening, while important, is less of a defining advantage of finishing teeth. Their manufacturing cost can vary and is not a distinguishing feature that highlights their primary use; the goal of finishing teeth is to provide that precise and high-quality cut essential in applications requiring close tolerances.