Chart with LSL and USL: What is it's name?

G.Pito

Starting to get Involved
#1
Sorry for this very basic question.

I simply need besides CP and CPK index to display a chart where:
Y Axis: Values
X Axis: Parts
USL and LSL limits are displayed.

This is not a X-Chart since single values are displayed (sample size = 1) but what is the FORMAL NAME of a chart like this?

As reference I add an image where the chart I am referring to is displayed at the bottom.

Thank you for your help to a newbie :)

Giovanni
 

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J

jcsalinas2

#3
The top is a bar chart and the bottom looks like a run chart its kind of fuzzy? WHAT data are you trying to get?

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Ninja

Looking for Reality
Trusted Information Resource
#4
For the lower chart, You say Spec Limits...and they are labeled USL and LSL
...but then there is that pesky +3sigma and -3sigma note over on the right.

Assuming that the line labeled USL is in reality +3sigma...it is really an upper control limit, not an upper spec limit.

Assuming that this is the case, some software programs (SAS JMP, NWA QA, etc.) call this an "I-chart"

Run chart
Control chart
I-chart
process chart
Ginger Rogers
...whatever you call it, it is a tool to track your process mean and variation to help determine if your process is "in control".
 
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