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Help with a profile callout

constadin
Hello all!

Fast question for the following callout:



The callout is for controlling these 2 "L" shaped pockets(?!). This is actually half the part as there is a mirror half on the right side (thus the 2x and 4x designations on the basic dimensions). I am a bit confused as the 2.6 basic dimension is restricting translation of the vertical planes while the callout has no datums in the callout. Is this correct?

How would you control this in a no CAD program? Thanks in advance for your advices Slight smile
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  • neil.challinor

    Don't forget that because there are no datums, both profile callouts must be evaluated simultaneously. You will need to use either XactMeasure or the Geometric Tolerance command to do this, depending on what version of PC-DMIS you have - legacy cannot perform simultaneous evaluations. Also, because you don't have a CAD model, you will need to make sure the nominals are correct and will not be able to use iterate and re-pierce.

    I am not sure to understand this. Since there is no datum I would imagine they care only about the form error. By controlling them simultaneously, I am making the 7.8 basic dimension being part of the evaluation (and subsequently more important than the 2.6 one), aren't I? I use version 2017 R2 btw.
  • in reply to constadin
    I think you need to ask whoever supplied the drawing to you. Are there any other callouts controlling those pockets back to any datums? To me, it seems they want to control the relationship of the pockets to each other (because of the 7.8 basic dimension) and they want to control the relationship of the pockets to the top of the outer radius (using the 2.6 basic dimension). You would need an additional callout to control the 2.6 but evaluating the two profiles simultaneously will maintain the 7.8 relationship. Evaluated separately, each profile will be free to optimize as much as it needs to in order to minimise the form and size deviation and they will not relate to each other at all.
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  • in reply to constadin
    I think you need to ask whoever supplied the drawing to you. Are there any other callouts controlling those pockets back to any datums? To me, it seems they want to control the relationship of the pockets to each other (because of the 7.8 basic dimension) and they want to control the relationship of the pockets to the top of the outer radius (using the 2.6 basic dimension). You would need an additional callout to control the 2.6 but evaluating the two profiles simultaneously will maintain the 7.8 relationship. Evaluated separately, each profile will be free to optimize as much as it needs to in order to minimise the form and size deviation and they will not relate to each other at all.
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