Table 4: Component importance for hours.

ComponentBirnbaum importanceRankBarlow-Proschan importanceRankTime integral importanceRankNatvig importanceRankWu importanceRankIntegrated importanceRank

CNC control system0.029960.108561.025560.1160610.33 × 10−451.6513 × 10−56
Tool carry0.038830.135541.717510.168319.73 × 10412.1559 × 10−53
Power supply and electrical system0.040710.144911.363420.1640210.09 × 10−422.2611 × 1051
Chip-removal system0.038040.136531.249540.1494410.23 × 10−442.1089 × 10−54
Lubrication system0.029070.107271.017670.0907710.65 × 10−471.5944 × 10−57
Hydraulic system0.026180.097281.000080.0205810.82 × 10−481.4263 × 10−58
Main transmission system0.035250.128951.079350.1326510.49 × 10−461.9452 × 10−55
Clamp system0.039520.141221.262030.1584310.13 × 10−432.1938 × 10−52