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


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  Post Number #1  
Old 4th May 2017, 05:47 AM
G.Pito

 
 
Total Posts: 6
Let Me Help You Chart with LSL and USL: What is it's name?

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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  Post Number #2  
Old 4th May 2017, 06:07 AM
Bev D's Avatar
Bev D

 
 
Total Posts: 3,487
Re: Chart with LSL and USL: what's its name?

It is a "run" chart.
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  Post Number #3  
Old 5th May 2017, 04:01 AM
jcsalinas2

 
 
Total Posts: 1
Re: Chart with LSL and USL: What is it's name?

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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  Post Number #4  
Old 5th May 2017, 08:14 AM
Ninja's Avatar
Ninja

 
 
Total Posts: 769
Re: Chart with LSL and USL: What is it's name?

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".
  Post Number #5  
Old 5th May 2017, 10:36 AM
CalRich's Avatar
CalRich

 
 
Total Posts: 126
Re: Chart with LSL and USL: What is it's name?

For individual numbers, what is used is an Xi chart, with the variation-based chart being MRbar chart.
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