How is tool life defined in metal cutting?

Tool life in metal cutting is specifically defined as the length of time a cutting tool can effectively perform its function before it is considered no longer usable or has failed. This measure is critical in the machining process because it directly impacts productivity, cost-efficiency, and the quality of the finished workpiece.

Understanding tool life helps machinists and manufacturers plan maintenance schedules, optimize cutting parameters, and choose the right tools for specific operations. A tool that lasts longer reduces downtime and increases overall efficiency, making it a vital consideration in manufacturing environments.

The other choices do not accurately capture the definition of tool life. The total processing time of a machine represents a broader operational time metric, while the total number of cuts focuses solely on the quantity of work done rather than the condition of the tool. The efficiency rating of a machining operation assesses performance but is not synonymous with tool life.