[Ia...] Posted October 21, 2021 Share Posted October 21, 2021 I don't ever work with Iso drawings, so this is probably from lack of experience, but I'm very confused on a drawing I have. B datum is a pattern of holes consisting of 20 holes. I understand that B-B would indicate that it is more than one feature that makes up the datum. However, I have different callouts with a DRF of |A|B| and also |A|(B-B)|. I'm leaning towards it being a drawing error, because I don't understand how you can use both. I unfortunately don't have access to ISO GPS, but with some screen shots I've seen, it only indicates that (B-B) indicates multiple features. Link to comment Share on other sites More sharing options...
[Ke...] Posted October 21, 2021 Share Posted October 21, 2021 My "best guess" is that the callout to IAIBI uses only the first B datum feature, while IAIB-BI is a seperate callout to indicate the use of a pattern... I suggest posting a screenshot or rough sketch of the callout; I'm sure that someone more familiar with ISO will comment, when they wake up 🤣 #heresyourbump Link to comment Share on other sites More sharing options...
[Ia...] Posted October 21, 2021 Author Share Posted October 21, 2021 I'm also unsure of what H14 means, but I think I can figure that out with a little more research. Link to comment Share on other sites More sharing options...
[No...] Posted October 21, 2021 Share Posted October 21, 2021 Please sign in to view this quote. ISO 286-1 and -2 H14 is a tolerance spec for holes. Link to comment Share on other sites More sharing options...
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