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Using " Size dimension " option in PCDMIS 2017 R2 ( Vision system )

Using " Size dimension " option in PCDMIS 2017 R2.

I had a doubt regarding the Size dimension option in PCDMIS.

While doing ISO dimensions - I found this option which is useful in giving desired output.

But I got strange feeling about how PCDMIS calculating dimensions.

Since its a very small area , i had to use Vision system to create individual points and constructed as MAX.INSC circle.

Then i use " Size dimension " option to evaluate LP and GX together.

Dimension : Dia 8.54 + 0 (LP) , -0.03 ( GX )

Example : 1

Standard : ISO 14405-1

Here , 8.54 is nominal
LP is given to upper tol.
GX is given to lower tol.



So i got value as : UPPER SIZE - 8.549
LOWER SIZE - 8.528


Example : 2

Standard : ISO 14405-1

8.54 is nominal
GX is given to upper tol.
LP is given to lower tol.

So i got value as : UPPER SIZE - 8.528
LOWER SIZE - 8.531




My question here is :

what is UPPER SIZE ?
How that is measured in software ?

Why I'm getting different LP , if I flip the modifiers ? ( 8.549 and 8.531 )
How LP value helps the functionality ?



Waiting for someone to clarify this......

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