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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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  • Regarding the LP

    Think of it as measuring the part with a 2-point-micrometer.
    You measure the part in different locations and get different values.
    If you put the LP on the lower tolerance, it compares your lowest measured value against the lower tolerance.
    If you put it on the upper tolerance, it compares the highest measured value against the upper tolerance.

    The LP is not 100% the same as measured with a micrometer (according to the standard) but it helps visualize the concept.
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  • Regarding the LP

    Think of it as measuring the part with a 2-point-micrometer.
    You measure the part in different locations and get different values.
    If you put the LP on the lower tolerance, it compares your lowest measured value against the lower tolerance.
    If you put it on the upper tolerance, it compares the highest measured value against the upper tolerance.

    The LP is not 100% the same as measured with a micrometer (according to the standard) but it helps visualize the concept.
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