Which cutting tool property is often improved by the use of a lubricant?

The use of a lubricant in machining processes primarily enhances machinability, which refers to how easily a material can be cut and shaped by a tool. Lubricants facilitate smoother motion between the cutting tool and the workpiece, reducing friction and heat generation. This creates less wear on the tool, allowing it to maintain its cutting edge for a longer period and improving the overall efficiency of the machining operation. When machinability is improved, it often results in better surface finishes and reduced energy consumption during cutting.

While other properties such as heat resistance, corrosion resistance, and durability can also be positively influenced by certain types of lubricants and coolant systems, the primary and most direct improvement from lubrication is summarized as enhanced machinability. This makes the cutting process easier and more efficient.