What business problem statement are you trying to solve? @feodor85
I’d use your process capability, data gathering (X and Y), and SPC to give you hints as to where you should focus–yes reducing variability will have an effect on mean but typically focus on mean shift OR variability reduction independently. It might sound counterintuitive but if…[Read more]
@feodor85 First if it is acceptable to move the spec then it should not have been there in the first place. You don’t move the spec just because the process is drifting closer to it.
Let me try an example. I had a process where I was plating gold. The most profitable place to operate is right on the lower spec limit with a mean equal to the spec…[Read more]