A Simulation Model for Machine Efficiency Improvement Using Reliability Centered Maintenance: Case Study of Semiconductor Factory

Table 1

Severity evaluation criteria.

Effect	Ranking	Criteria: severity of effect
Hazardous without warning	10	A potential failure mode endangers operator, machine, or assembly without warning.
Hazardous with warning	9	A potential failure mode endangers operator, machine, or assembly with warning.
Very high	8	Machine produced Lead defects greater than 4 hours.
High	7	Machine produced Lead defects between 2 hours and 4 hours.
Moderate	6	Machine produced Lead defects between 1 hour and 2 hours.
Low	5	Machine produced Lead defects between half an hour and 1 hour.
Very low	4	Machine produced Lead defects between 10 minutes and half an hour.
Minor	3	Machine produced Lead defects less than 10 minutes.
Very minor	2	Critical machine parameter was out of specification limits but needs to adjust during operation.
None	1	Critical machine parameter was out of specification limits and may adjust during preventive maintenance.