Capability study with a minimum spec

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qcman

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#1
#1
Hoping for some help on this. How do you do a capability study on something that has a minimum spec only? In this case it is a minimum coating thickness of .236mil I normally use QImacro to run the numbers and while I have yet to learn Minitab I do have that.
 
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Ninja

Ninja

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#2
#2
If it were me, and assuming that a 'less than zero' coating thickness is not possible, I would do a GRR on a spec range of 0.000-0.236mil and see if that closed the discussion.
Then adjust the scale to 0.230-0.236mil, how's that?

Do you have any operator measurements within 0.005 mil of the minimum?
Are you riding the line, or is this a numbers exercise when your mean coating is 0.527mil?

What is the resolution of your measuring equipment?
 
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qcman

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#3
#3
Spec is .236mil min coating so any less is NG. Attached are the numbers (2 place reading) that I am working with. We target .25 as more just wasteful.
 

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Ninja

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#4
#4
Have a look at Miner's blog ... look specifically for one-sided spec...
@Miner covers this far better than I could... I was waiting for him to chime in, but he hasn't so far. He may yet.
 
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