3.4.4. T4—Flank Wear Measurement

The flank wear analysis for the final tool type, T4, is presented in this subsection. Average flank wear values, measured on the clearance faces of these tools and tested for all different conditions, can be observed in Table 15.

**Table 15.** VB values obtained from measurements performed on the clearance faces of T4 tools.


In this case, the flank wear increased with cutting length, especially at 75% and 100% feed rate values. There was an influence in wear registered for the 125% feed rate; however, the registered increase was very slight. In terms of flank wear variation coupled with the feed rate, as seen in the previously analyzed tool (T3), the lowest values of flank wear were registered for higher feed rates; however, the wear values registered at the lowest feed rate

condition were like those obtained at the 125% feed rate, especially for the test conducted with 2 m of cutting length. The highest amount of wear was produced at a 100% feed rate value at 4 m of cutting length, which impacted the overall quality of the machined surface [11] as seen in the previous section, and was followed by T4L2F100. It is also worth noting that the produced values of flank wear were low when compared to those obtained in T1 and T2, indicating that this tool has good wear performance when machining this type of material, even at higher feed rates.
