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GD&T "size" always different from dimension "size"

Hello,

Just trying to figure this out - when I dimension a circular feature I'll get one size but when adding a GD&T dimension for that same exact feature I get a different size altogether (example below). What's the reason for this?


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  • i'd like to add to this question.
    I understand going from DEFAULT to LSQ and getting different results for Diameters.

    But how does the going from DEFAULT to LSQ on FEATURE MATH work?
    What is DEFAULT doing? If I have a best fit bolt pattern what MATH do I want?




    Is it just recalculating the TP based on the diameter since the LSQ and the DEFAULT (MAX_INSC) have slightly different center locations?

    Attached Files
  • I believe the default is set same as the "SA" toggle when using a size dimension FCF, double check me by adding in a size dimension, tabbing over to ISO from ASME and click SA when tolerancing the size.

    Should report the same size as the diameter shown in a TP or any callout that allows the reporting of a diametrical size.
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