The company executives will visit the site and you are required to provide a bas
ID: 442747 • Letter: T
Question
The company executives will visit the site and you are required to provide a baseline estimate of a sigma level of the chassis welding operation. Compute and estimate baseline process sigma level and long term process capability based on the following data (Hint: To get sigma level estimate, report your yield result based on 1 decimal place and then go to table, don’t interpolate just list the closest sigma level to your yield result):
Welding Operation Data:
Number of Units: 10000
Opportunities per unit: 3
Defects: 189
Explanation / Answer
Units = 10000
Opportunity per unit = 3
Defects = 189
Opportunities = 10,000 * 3 = 30,000 opportunities
Defects per Opportunity = 189 / 30,000 = 0.0063
Defects per million opportunity = 0.0063 * 1,000,000
= 6300
From the table
6300 DPMO translate the sigma level between 3.9 & 4. Therefore Baseline Process sigma is equal to 3.95
Process Capability is between 1.3 & 1.33. Therefore Process Capability = (1.3 + 1.33) / 2 = 1.315
Normalised Yield = (99.2% + 99.4%) / 2 = 99.3%