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Assign the Average Deviation and Standard Deviation of a Profile

Hi Y'all.

I have a simple question with a long-winded lead up, so please bear with me.

I have a customer that would like us to start reporting the Average Deviation and Standard Deviation of profile measurements. They even want to apply tolerances to these metrics. So, I'm looking for a way to display these on the report with a tolerance applied. That way our CMM operators can make a quick pass/fail judgment on each part.

I see that PC-DMIS has the option to display these metrics in a DIMINFO box, but I don't see a way to make them appear directly on the report. Even so, what I would really like to do is assign those values to some variables so I can go the route of putting them in generic features and reporting them with tolerances applied.

For example. Here is a Legacy Profile Dimension from the Edit Window:


And how it appears on the report:


From the DimInfo Box Dialog window I have access to the metrics I want.


And I can see from the Graphics Display Window that the values are being calculated:


I found that I can get the Standard Deviation using the GetText command:

However, I just can't seem to find a way to get the Mean value.

​Does anyone know how I can assign the Mean value to a variable? Or possibly an easier way to get the Standard Deviation value?
Or can you think of any other routs I may take to report these metrics with tolerances applied?


Parents
  • Why don't they just assign a Cpk and/or Ppk value to the profile measurements and control it with SPC?


    That might be an option. We don't currently use SPC software where I work, but we could change that.

    Can SPC software do stats on the form deviations of individual features on individual parts? How does that work? I'm only familiar with doing SPC on many parts.
Reply
  • Why don't they just assign a Cpk and/or Ppk value to the profile measurements and control it with SPC?


    That might be an option. We don't currently use SPC software where I work, but we could change that.

    Can SPC software do stats on the form deviations of individual features on individual parts? How does that work? I'm only familiar with doing SPC on many parts.
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