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Profile of a Surface - Tube

Discussion in 'GD&T Standards and Practices - ASME & ISO' started by Dennis Biesma, Mar 25, 2019.

  1. Dennis Biesma

    Dennis Biesma New Member

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    I have a question concerning a Profile of a Surface callout on a print. I've attached a .png that shows the drawing (dimensions changed to protect me). However, I am not understanding how to apply the Profile of a surface callout to the part (Balloon #7).

    Please note that above balloon #4 there is a circled "B2", and below balloon #6, there is a circled "B1", which I did not put into my snagged excel rendering.

    Thanks in advance for any explanation that I can understand.
     

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  2. _Zeno_

    _Zeno_ Member

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    Balloon 7 only applies to balloon 2 since the rest of the geometry is controlled. It is the same as saying 160.40 ± .15

    Additionally the position note (balloon 5) is really controlling perpendicularity.

    I highly suspect the selection of datum A does not represent actual function and that the "designer" is simply decorating this print with GD&T without a true understanding of what it says or means. Good luck getting them to fix it.
     
  3. Dennis Biesma

    Dennis Biesma New Member

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    Thank you, kind sir. You're both a gentleman and a scholar. Not necessarily in that order, but possibly.


     

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