A Simulation Model for Machine Efficiency Improvement Using Reliability Centered Maintenance: Case Study of Semiconductor Factory
Table 3
Detection evaluation criteria.
Detection
Ranking
Range of detection methods
Almost impossible
10
Cannot detect or is not checked.
Very remote
9
Control is achieved with indirect or random checks only.
Remote
8
Control is achieved with visual inspection only.
Very low
7
Control is achieved with double visual inspection only.
Low
6
Control is achieved with charting methods, such as SPC (statistical process control).
Moderate
5
Control is based on variable gauging after parts have left the station, or go/no go gauging performed on 100% of the parts after parts have left the station.
Moderately high
4
Error detection in subsequent operations, or gauging performed on setup and first-piece check (for set-up causes only).
High
3
Error detection in station, or error detection in subsequent operations by multiple layers of acceptance: supply, select, install, verify, cannot accept discrepant part.
Very high
2
Error detection in station (automatic gauging with automatic stop feature). Cannot pass discrepant part.
Very high
1
Discrepant parts cannot be made because item has been error-proofed by process/product design.
