## 3 Materials and Methods
### Device Inspection Results  
The validation of the designed device was carried out through a detailed metrological inspection using a Hexagon RA-7312 3D measuring arm. This procedure allowed for the quantification of the device's dimensional deviations and the evaluation of its angular accuracy. Figure 20 shows a screenshot from the PC-DMIS 2024.1 software, illustrating the communication interface with the 3D measuring arm and the measurement results. The flatness measurement results for the relevant surfaces of the device are presented below:  
* Bottom: 0.003 mm
* Side: 0.008 mm
* Top: 0.002 mm
* Secondary locating surface/Stationary Jaw: 0.005 mm
* Primary locating surface: 0.004 mm
* Third locating surface: 0.007 mm
* Cutting surface: 0.012 mm  
These flatness values, ranging from 0.002 mm to 0.012 mm, are all well within the specified nominal tolerance of 0.05 mm (as seen in Table 3), indicating a high degree of precision in the manufactured surfaces. This high flatness is essential for ensuring correct and stable seating of the workpiece, which directly contributes to machining accuracy. Figure 20: PC-DMIS software interface, illustrating the data obtained from measurements with the 3D arm. The angular accuracy of the device was evaluated by measuring the programming angle and the complementary angle, obtaining the following values:  
* Programming angle: 42.505\({}^{\circ}\) \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Feature** & **Nominal Value** & \begin{tabular}{c} **Measured** \\ **Value** \\ \end{tabular} & **Deviation** & \begin{tabular}{c} **Upper** \\ **Tolerance** \\ \end{tabular} & \
\begin{tabular}{c} **Lower** \\ **Tolerance** \\ \end{tabular} &
\begin{tabular}{c} **Out of** \\ **Tolerance** \\ \end{tabular} \\ \hline Bottom—X & 278.536 & 278.536 & 0 & 0.05 & \(-\)0.05 & 0 \\ Bottom—Y & 103.899 & 103.899 & 0 & 0.05 & \(-\)0.05 & 0 \\ Bottom—Z & 96.564 & 96.564 & 0 & 0.05 & \(-\)0.05 & 0 \\  & 0 & 0.003 & 0.003 & 0.05 & & 0 \\ Side—X & 275.639 & 275.639 & 0 & 0.05 & \(-\)0.05 & 0 \\ Side—Y & 47.676 & 47.676 & 0 & 0.05 & \(-\)0.05 & 0 \\ Side—Z & 120.262 & 120.262 & 0 & 0.05 & \(-\)0.05 & 0 \\  & 0 & 0.008 & 0.008 & 0.05 & & 0 \\ Top—X & 275.961 & 275.961 & 0 & 0.05 & \(-\)0.05 & 0 \\ Top—Y & 71.734 & 71.734 & 0 & 0.05 & \(-\)0.05 & 0 \\ Top—Z & 151.197 & 151.197 & 0 & 0.05 & \(-\)0.05 & 0 \\  & 0 & 0.002 & 0.002 & 0.05 & & 0 \\ Stationary & 255.975 & 255.975 & 0 & 0.05 & \(-\)0.05 & 0 \\ Jaw—X & 114.411 & 114.411 & 0 & 0.05 & \(-\)0.05 & 0 \\ Stationary & 116.026 & 116.026 & 0 & 0.05 & \(-\)0.05 & 0 \\ Jaw—Z & 0 & 0.005 & 0.005 & 0.05 & & 0 \\ Primary & 279.3 & 279.3 & 0 & 0.05 & \(-\)0.05 & 0 \\ Locating & 279.43 & 279.43 & 0 & 0.05 & \(-\)0.05 & 0 \\ Surface—X & & & & & & \\ Proximary & 149.443 & 149.443 & 0 & 0.05 & \(-\)0.05 & 0 \\ Surface—Y & & & & & & \\ Primary & 125.871 & 125.871 & 0 & 0.05 & \(-\)0.05 & 0 \\ Surface—Z & & & & & & \\ \multicolumn{2}{c}{0} & 0.004 & 0.004 & 0.05 & 0 \\ \multicolumn{2}{c}{278.323} & 278.323 & 0 & 0.05 & \(-\)0.05 & 0 \\ Third Locating & 105.188 & 105.188 & 0 & 0.05 & \(-\)0.05 & 0 \\ Surface—Y & & & & & & \\ Third Locating & 132.204 & 132.204 & 0 & 0.05 & \(-\)0.05 & 0 \\ Surface—Z & 0 & 0.007 & 0.007 & 0.05 & & 0 \\ Cutting & 279.352 & 279.352 & 0 & 0.05 & \(-\)0.05 & 0 \\ Surface—Y & 156.438 & 156.438 & 0 & 0.05 & \(-\)0.05 & 0 \\ Cutting & 165.815 & 165.815 & 0 & 0.05 & \(-\)0.05 & 0 \\ Surface—Z & 0 & 0.012 & 0.012 & 0.05 & & 0 \\ ANGL1 & 42.504 & 42.504 & 0 & 0.1 & \(-\)0.1 & 0 \\ ANGL2 & 89.991 & 89.991 & 0 & 0.1 & \(-\)0.1 & 0 \\ ANGL3 & 89.954 & 89.954 & 0 & 0.1 & \(-\)0.1 & 0 \\ ANGL4 & 90.138 & 90.138 & 0 & 0.1 & \(-\)0.1 & 0 \\ ANGL5 & 0.014 & 0.014 & 0 & 0.1 & \(-\)0.1 & 0 \\ ANGL6 & 47.479 & 47.479 & 0 & 0.1 & \(-\)0.1 & 0 \\ ANGL7 & 132.495 & 132.495 & 0 & 0.1 & \(-\)0.1 & 0 \\ ANGL7 & 47.505 & 47.505 & 0 & 0.1 & \(-\)0.1 & 0 \\ ANGL8 & 47.489 & 47.489 & 0 & 0.1 & \(-\)0.1 & 0 \\ ANGL9 & 42.513 & 42.513 & 0 & 0.1 & \(-\)0.1 & 0 \\ ANGL10 & 42.493 & 42.493 & 0 & 0.1 & \(-\)0.1 & 0 \\ \hline \hline \end{tabular}
\end{table}