What is considered the cutting edge of a tool?

The cutting edge of a tool is defined as the part that makes contact with the workpiece during the machining or cutting process. This edge is critical for the tool's effectiveness, as it is where the actual shearing or removal of material takes place. A well-designed cutting edge can influence factors such as the quality of the cut, the efficiency of material removal, and tool wear. Understanding the function of the cutting edge helps in selecting the appropriate tool for a specific job and in implementing correct cutting techniques. The other options describe components of the tool that do not interact directly with the workpiece in a manner that contributes to the cutting action.