What is the tool typically used to cut an inside and outside keyway?

A broach is specifically designed for cutting keyways, both inside and outside, with high precision and efficiency. Broaching involves using a tool called a broach, which has a series of cutting teeth that progressively increase in size. This allows it to remove material as it is pulled or pushed through the workpiece, creating a precise keyway profile.

In industry applications, broaching is favored when consistent and accurate dimensions are required, making it an ideal choice for creating keyways that will accommodate keys to secure components like gears and pulleys.

While a milling machine can also cut keyways, it requires more setup and might not achieve the same level of efficiency or finish in one pass that a broach can provide. A lathe is primarily used for cylindrical work and is not the appropriate tool for cutting keyways, and a drill press is mainly for drilling holes, not for making keyways. Therefore, broaching stands out as the most suitable tool for this specific task.