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

Ajesh George
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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  • I don't think so, at least i haven't found out.
    What I usually do is look at the graphical analysis (with high multiplier) of the roundness but using legacy and a least square calculation.
    Like this I can try to "guess" what points are used for the LP.

    Edit:
    If you don't have many points you could also evaluate the 2 point distances of every point pair.
    One of the values should be close to the size calculation. (but not exactly)
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  • I don't think so, at least i haven't found out.
    What I usually do is look at the graphical analysis (with high multiplier) of the roundness but using legacy and a least square calculation.
    Like this I can try to "guess" what points are used for the LP.

    Edit:
    If you don't have many points you could also evaluate the 2 point distances of every point pair.
    One of the values should be close to the size calculation. (but not exactly)
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