Process sigma can be defined using following four steps:
Measure opportunities,
Measure defects,
Calculate yield,
Look-up process sigma.
DPMO=Total defectTotal Opportunities×1000000
Defect(%)=Total defectTotal Opportunities×100
Yield(%)=100−Defect(%)
ProcessSigma=0.8406+√29.37−2.221×(log(DPMO))
Where −
Opportunities = Lowest defect noticeable by customer.
DPMO = Defects per Million Opportunities.
Problem Statement:
In equipment organization hard plate produced is 10000 and the defects is 5. Discover the process sigma.
Solution:
Given: Opportunities = 10000 and Defects = 5. Substitute the given qualities in the recipe,