The nature of the machining process causes your tools to wear over time. Tool life is the amount of time a tool can cut before wear on the cutting edge makes it unusable.
In a stable machining process, tool life is predictable. Flank wear (2) and crater wear (1) are the most common ways of measuring tool life limits. The maximum allowed wear on a tool is subjective, and it will vary depending on the machining process. For example: a tool used in a finishing operation will have a lower limit for flank wear than a tool used in a roughing operation.
With the tool life management systems available on the Haas control, you can set known tool life limits. These systems indicate when a tool is close to the end of its useful life, so that you can replace the tool before it negatively affects the machining process.