## 3 Results and Discussion
### Results of Industrial Tests  
Wear Characterization of Tips  
The recession of the rake and clearance faces and the width of the wear land of all saws that were measured before the industrial tests (0 min) are presented in Table 7. Note that for the modified saws, the initial values at time 0 min presented in Table 7 is due to the modification of their cutting edges according to Figure 3b. The comparison of wear between the three types of circular saws listed in Table 3 as a function of sawing time is shown in Figure 21. The recession on the rake and clearance faces as well as the width of the wear land are presented as wear indexes for the wear comparison between all saws. As observed in Figure 21a-c, the saw with cutting edge modification and coating (#2) performed much better than the other saws (#4 and 6). The edge-modified saw without coating (#6) showed the second-best behavior in terms of wear resistance in an industrial setting while the up-sharp and coated saw (#4) showed the worst wear resistance. The wear rates of the three types of saws are presented in Table 8. For all saws, the wear rate was higher at the beginning of the test corresponding to the break-in period. \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multicolumn{1}{c}{**Test**} & \multicolumn{2}{c}{**CrN/CrCN/DLC**} & **CrN/AITIN** & **CrN/CrCN** & **CrCN/TISiCN** \\ \hline \multirow{4}{*}{Cracking} & Abrasive wear & \(\times\) & \(\times\) & \(\times\) & \(\times\) \\ \cline{2-5}  & Adhesive wear & \(\times\) & \(\times\) & \(\times\) & \(\times\) \\ \cline{2-5}  & Cracking & \(\times\) & & & \(\times\) \\ \cline{2-5}  & Delamination & \(\times\) & & & \(\times\) \\ \hline \multirow{4}{*}{Cracking} & Abrasive wear & \(\times\) & & & \(\times\) \\ \cline{2-5}  & Cracking & \(\times\) & & & \\ \cline{2-5}  & Delamination & \(\times\) & & & \(\times\) \\ \hline Friction coefficient at 250 mm/s & 0.30 & 0.65 & 0.31 & 0.56 \\ \cline{2-5}  & Wear rate at 250 mm/s & \(3.01\times 10^{-6}\) & \(4.67\times 10^{-7}\) & \(\begin{array}{c}3.18\times\\ 10^{-7}\end{array}\) & \(3.63\times 10^{-6}\) \\ \cline{2-5}  & (mm\({}^{3}\) N\({}^{-1}\cdot\)m\({}^{-1}\)) & & & & \\ \hline Volume loss after DSRW test (mm\({}^{3}\)) & \(11.9\times 10^{-1}\) & \(2.14\times 10^{-1}\) & \(\begin{array}{c}3.61\times\\ 10^{-1}\end{array}\) & \(8.13\times 10^{-1}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 6: Assessment of coating characterization following wear tests. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Saw Identification** & **Modified Saw** & **Up-Sharp Saw** \\ \hline Recession on clearance face (\(\mu\)m) & 10 & 3 \\ \hline Recession on rake face (\(\mu\)m) & 20 & 3 \\ \hline Width of the wear land (\(\mu\)m) & 17 & 2 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Initial measurements at 0 min on the clearance face, rake face, and the width of the wear land of the saws. Figure 21: Wear of circular saws as a function of sawing time, (**a**) recession on the clearance face, (**b**) recession on the rake face, and (**c**) width of the wear land. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline  & \multicolumn{2}{c}{**First Phase of the Test (between 0 min and 480 min**} & \multicolumn{2}{c}{**Second Phase of the (between 480 min and 960 min**} \\  & & **of Sawing)** & & & **of Sawing)** \\ \cline{2-6}
**Saw** & **Rate of Wear** & **Rate of Wear on the** & **Rate of Wear on the** & **Rate of Wear on the** & **Rate of Wear on** & **Rate of Increase of** \\
**Identification** & **One the Clearance Face** & **the Lake Face** & **(um/h)** & **Wear Land** & **Clearance Face** & **(um/h)** & **Wear Land** \\  & **(um/h)** & & **(um/h)** & **(um/h)** & **(um/h)** & **(um/h)** \\ \hline \#2 & \(11.1\) & \(7.6\) & \(8.7\) & \(3.7\) & \(3.7\) & \(2.9\) \\ \hline \#4 & \(18.0\) & \(15.6\) & \(16.2\) & \(15.9\) & \(6.3\) & \(10.9\) \\ \hline \#6 & \(14.1\) & \(8.5\) & \(10.4\) & \(5.0\) & \(5.7\) & \(4.9\) \\ \hline \hline \end{tabular}
\begin{tabular}{c c c c c c} \hline \hline  & & & & & \\ \end{tabular}
\end{table}