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True position Question

constadin
Hello guys,

Sorry for the dump question (and draft paint image) but I am a bit confused:




I have a TP callout for the hole (center of image) on a part like that. Datum A is the Upper plane (basic dimension value not important), Datum B is the vertical Ø through the part as displayed in dashed lines and Datums C as per picture. The callout is A/B/C and I was wondering since C is controlling the rotation in this datum structure, it would be wrong to control this hole as a circle right ? It would need to be a cylinder...
Thanks in advance for your help Slight smile
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  • Without C, both red and green holes would be ok...
    {"data-align":"none","data-size":"medium","data-attachmentid":528283}
    Measuring as a circle should be enough (IMO)

    But if I measure as a circle (thus projected in I vector defined by datum A and C) what is the point of using the C datum in the callout all together? Wouldn't it be the same to write A/B only? (I am not questioning your suggestion btw, just wanna learn how this works Slight smile ; Learning from this example/post is more important that the actual problem I am facing).
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  • Without C, both red and green holes would be ok...
    {"data-align":"none","data-size":"medium","data-attachmentid":528283}
    Measuring as a circle should be enough (IMO)

    But if I measure as a circle (thus projected in I vector defined by datum A and C) what is the point of using the C datum in the callout all together? Wouldn't it be the same to write A/B only? (I am not questioning your suggestion btw, just wanna learn how this works Slight smile ; Learning from this example/post is more important that the actual problem I am facing).
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