## 5 Analysis of Calculation Results and Discussion
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline  & & & & & & & & & & \\ \multirow{2}{*}{**Group**} & \multirow{2}{*}{**Group**} & **Specific** & **Expanded** & **Drilling** & **Measurement** & **Drilling** & **Energy** & **Consement** \\  & & **Cutting** & **Measurement** & **Energy** & **Uncertainty** & **Energy** & **Uncertainty** & **Energy** & **Uncertainty** \\ \multirow{2}{*}{**No.**} & \multirow{2}{*}{**Group**} & **Energy** & **Uncertainty** & & & & & & & \\ \cline{3-10}  & & & & & & & & & & & \\ \cline{3-10}  & & **(MJ/m\({}^{3}\))** & **(MJ/m\({}^{3}\))** & **(MJ/m\({}^{3}\))** & **(\%)** & **(MJ/m\({}^{3}\))** & **(MJ/m\({}^{3}\))** & **(\%)** \\ \hline
1 & Redi. Trogir & 233.04 & \(\pm\)179.05 & 78.58 & 1919.37 & \(\pm\)24.87 & 1.32 & 1805.12 & \(\pm\)939.51 & 53.96 \\
2 & Rasotica. & 283.15 & \(\pm\)188.48 & 64.59 & 1176.59 & \(\pm\)15.46 & 1.31 & 1194.67 & \(\pm\)728.20 & 61.03 \\
3 & Roof layer & 616.52 & \(\pm\)370.76 & 59.12 & 2285.05 & \(\pm\)28.78 & 1.26 & 2188.48 & \(\pm\)1263.21 & 57.7 \\
4 & Roof layer & 578.73 & \(\pm\)356.76 & 61.64 & 2339.06 & \(\pm\)28.12 & 1.2 & 1710.3 & \(\pm\)1204.61 & 71.01 \\
5 & Roof layer & & & & & & & & \\ \multirow{2}{*}{**5**} & E/F. & 299.9 & \(\pm\)262.08 & 92.56 & 1391.6 & \(\pm\)17.42 & 1.3 & 1411.14 & \(\pm\)683.92 & 48.94 \\  & Kanfranar & & & & & & & & & \\ \multirow{2}{*}{**6**} & G. Kanfranar & 173.39 & \(\pm\)267.01 & 164.43 & 951.53 & \(\pm\)11.02 & 1.16 & 1178.39 & \(\pm\)374.51 & 32.53 \\
7 & Roof layer & 341.34 & \(\pm\)344.05 & 102.06 & 1461.67 & \(\pm\)17.60 & 1.2 & 1619.83 & \(\pm\)682.82 & 46.84 \\
8 & Roof layer I & 488.26 & \(\pm\)368.61 & 74.71 & 1965.91 & \(\pm\)27.29 & 1.39 & 1803.06 & \(\pm\)1083.57 & 62.84 \\ \multirow{2}{*}{**8**} & Average value & 376.79 & \(\pm\)292.10 & 87.21 & 1686.35 & \(\pm\)21.32 & 1.27 & 1613.87 & \(\pm\)870.04 & 54.36 \\ Minimum value & 173.39 & 179.05 & 59.12 & 951.53 & 11.02 & 1.16 & 1178.39 & 374.51 & 32.53 \\ Maximum value & 616.52 & 307.76 & 164.43 & 2339.06 & 28.78 & 1.39 & 2188.48 & 1263.21 & 71.01 \\ Standard deviation & 164.16 & 79.26 & 34.64 & 514.66 & 6.76 & 0.08 & 341.92 & 305.26 & 11.76 \\ \hline \end{tabular} Note: In all the calculation cases of the expanded measuring uncertainty k = 2. \(p\) = 95%; where: k = coverage factor; \(p\) = level of confidence.  
\end{table} 
Table 4: Presentation of measurement results of specific cutting and drilling energies (both measuring systems) with corresponding measurement uncertainties. Figure 7: Diagram of the dependence of the specific rock cutting energy on the specific drilling energy (electrical power measuring system) by groups. From Table 4, but also in Figures 7 and 8, it can be seen that the measurement uncertainty associated with the results of measuring the specific drilling energy obtained using the power measuring system is significantly less than the measurement uncertainties associated with the results of measuring specific cutting or drilling energy obtained with the measuring system with force transducer or measuring system with force and torque measuring transducer. This indicates the quality of the measuring system. The increase in the measurement uncertainty associated with the measurement results of the specific cutting energy is also influenced by the small mass of rock fragments formed by cutting. A very good correlation between the field measurement of specific energies and the laboratory one can be seen in Figure 9.  
Figure 8: Diagram of the dependence of the specific rock cutting energy on the specific drilling energy (measuring system with force and torque transducer) by groups. Figure 9: Presentation of the field measurement of specific energies with laboratory measurements by groups. The used measuring systems have advantages and disadvantages. Their comparison is based on the specific indicators presented in the Table 5.  
Comparing the indicators from the Table 5, it was concluded that the system for measuring power has several advantages over the measuring system with a measuring force transducer.