## 4 Practical Application
\begin{table}
\begin{tabular}{c c c c c c|c c c c c} \hline \hline \multicolumn{6}{c|}{a1 External diameter (A) \(19\pm 0.04\) mm} & \multicolumn{6}{c}{a2 External diameter manufacturing time (A) \(300\pm 40\) s} \\ \hline
**Sample** & \(X_{1}\) & \(X_{2}\) &... & \(X_{11}\) & \(\overline{X}\) & **Sample** & \(X_{1}\) & \(X_{2}\) &... & \(X_{11}\) & \(\overline{X}\) \\ \hline
**1** & **19.005** & **19.01** &... & **19.004** & **19.001** & **1** & **311** & **293** &... & **312** & **298.1** \\ \hline
**2** & **18.994** & **18.995** &... & **19.007** & **18.998** & **2** & **288** & **286** &... & **295** & **297.3** \\ \hline \hline \multicolumn{6}{c|}{} \\ \hline � & � � & � & � & � & � & � & � & � & � & � & � \\ \hline
**20** & **18.991** & **19.021** &... & **19.006** & **19.002** & **20** & **287** & **304** & **...** & **309** & **299.5** \\ \hline \multicolumn{6}{c|}{b1 Internal diameter (B) \(10^{+0.03}_{+0.01}\) mm} & \multicolumn{6}{c}{b2 Internal diameter manufacturing time (B) \(300\pm 40\) s} \\ \hline
**Sample** & \(X_{1}\) & \(X_{2}\) &... & \(X_{11}\) & \(\overline{X}\) & **Sample** & \(X_{1}\) & \(X_{2}\) &... & \(X_{11}\) & \(\overline{X}\) \\ \hline
**1** & **10.020** & **10.019** &... & **10.019** & **10.020** & **1** & **315** & **284** &... & **304** & **296.7** \\ \hline
**2** & **10.023** & **10.022** &... & **10.022** & **10.020** & **2** & **291** & **291** & **...** & **300** & **295.2** \\ \hline � & � & � & � & � & � & � & � & � & � & � & � \\ \hline
**20** & **10.020** & **10.018** &... & **10.019** & **10.019** & **20** & **294** & **316** &... & **305** & **295.2** \\ \hline \multicolumn{6}{c|}{c1 Threads (C) \(8.125\pm 0.1\) mm} & \multicolumn{6}{c}{c2 Threads manufacturing time (C) \(600\pm 40\) s} \\ \hline
**Sample** & \(X_{1}\) & \(X_{2}\) &... & \(X_{11}\) & \(\overline{X}\) & **Sample** & \(X_{1}\) & \(X_{2}\) &... & \(X_{11}\) & \(\overline{X}\) \\ \hline
**1** & **8.123** & **8.137** &... & **8.098** & **8.122** & **1** & **589** & **607** &... & **606** & **600.3** \\ \hline
**2** & **8.118** & **8.105** &... & **8.135** & **8.119** & **2** & **619** & **584** &... & **603** & **598.8** \\ \hline � & � & � & � & � & � & � & � & � & � & � \\ \hline
**20** & **8.106** & **8.127** &... & **8.141** & **8.120** & **20** & **581** & **616** &... & **614** & **600.2** \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Process quality characteristics \(\delta\), \(\gamma\), and \(I_{\text{MT}}\). The manufacturing time performance defect rate index \(J_{MT}\) was added as the \(Z\)-axis, as shown in Figure 9. If manufacturers set the manufacturing time performance defect index \(J_{MT}\) at 0.006, Figure 9 clearly shows that process quality characteristic A (external diameter) and process quality characteristic B (internal diameter) were both within the model. This indicates that the manufacturing time performance met the standard. Process quality characteristic C (threads) protruded outside the model, indicating that the manufacturing time performance exceeded the range of approval and its mean value was overly large. The implication is that the manufacturing process quality characteristic C must be shortened for the product to be shipped on time. The manufacturing process quality performance evaluation model clearly indicates whether the manufacturing process quality and manufacturing time performance of bearing connectors have met the requirement. Process quality characteristic C (threads) performance in terms of manufacturing process quality and manufacturing time performance failed to meet the standard. An investigation revealed that bearing connectors can easily deform during the process of thread carving. Because of this problem, the manufacturer would adjust their parameter settings and improve their technical skills. This case shows that manufacturers can use the model as a reference to improve the manufacturing process.