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

JEFMAN over 1 year ago

You said assignment ?

DISPLAYPRECISION/6 (or 7 in inches)
ASSIGN/T_VALUE=DOT(DSCN01.HIT[1..DSCN01.NUMHITS].XYZ-DSCN01.HIT[1..DSCN01.NUMHITS].TXYZ,DSCN01.HIT[1..DSCN01.NUMHITS].TIJK)
ASSIGN/MEAN=AVERAGE(T_VALUE)
ASSIGN/STD_DEV=SQRT(SUM(T_VALUE^2-MEAN^2)/(DSCN01.NUMHITS-1))

If there's no AVERAGE in your version, just

ASSIGN/AVERAGE=SUM(T_VALUE)/DSCN01.NUMHITS

Reply

JEFMAN over 1 year ago

You said assignment ?

DISPLAYPRECISION/6 (or 7 in inches)
ASSIGN/T_VALUE=DOT(DSCN01.HIT[1..DSCN01.NUMHITS].XYZ-DSCN01.HIT[1..DSCN01.NUMHITS].TXYZ,DSCN01.HIT[1..DSCN01.NUMHITS].TIJK)
ASSIGN/MEAN=AVERAGE(T_VALUE)
ASSIGN/STD_DEV=SQRT(SUM(T_VALUE^2-MEAN^2)/(DSCN01.NUMHITS-1))

If there's no AVERAGE in your version, just

ASSIGN/AVERAGE=SUM(T_VALUE)/DSCN01.NUMHITS

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