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Is there a usage standard for CALLOUTS that have boundary geometry?
I am looking for a standards document that defines how various boundary geometry used in a CALLOUT should be used.
A Google search only returns callout examples in drawings created by various CAD tools.
I am looking for a standard that explains/defines correct usage in words.
0
Answers
Depends where you are in the world. And what industry you're in. And what company you work for.
Never forget, at the end of the day the job of a drawing is to communicate. If the people you're communicating with aren't familiar with what it means without looking it up either, that's crappy communication. Sometimes you're best off just writing it out.
But fyi, here are a few big ones:
Australia: AS1100 series
ISO: ISO 01.100 series
US: ASME Y14 series
It is my understanding/experience that drawing standards/practices are an organic beast which is ultimately set by the organization in which you are creating a drawing for. I just want to use callout symbols according to general accepted usage.
Since OS has baked-in a set of callout/flag note styles I was hoping to find an simple "generally accepted" explanation/definition for each type on the web from a trusted source.
The problem with standards organizations is they keep their information behind a paywall, which runs counter to their mission statement.
Well I did some more googling and found a discussion on this exact thing:
https://elsmar.com/elsmarqualityforum/threads/what-is-the-significance-of-a-drawing-note-number-appearing-inside-a-box.44325/
The technical name for them is flagnote symbols. From that thread:
I dug through some files that came home with me from work when I retired. Found a PDF of ASME Y14.100-2004 (which even after 20 years appears to be the most current revision). I referenced parts of it when creating/unifying a set of starter drawing templates for the company I worked for, which needed to be optimized to work in the CAD system currently being used.
It appears that OS did a broad survey of drawings in the wild to determine all the possible symbols that might be used with flag notes and callouts and included them in OS. In reality there is no officially industry standard with respect to flag/callout symbol usage.
I have to say Y14.100 is a classic example of designing a horse by committee; you get a camel.
Industry conventions and company drawing practices appear to be all over the map. At best ASME Y14.x documents contain a mish mash of information that a company might consider when documenting their internal drawing practices.
2017 is the latest version of ASME Y14.100. I have the 2013 version, and the flag note section doesn't say much.
You are correct, Y14.100-2017 is the latest revision.
Cut & paste from 2013 revision of Section 4.26.6 (f) is identical to the 2004 revision. Still no description of flag symbol style significance.
Should I assume the statement, "The same flagnote symbol shall be throughout the drawing." means you pick a one symbol style and use it for ALL flagnotes. A mix of flagnote symbol styles cannot be appear within the same drawing. In my experience I have seen multiple flagnote styles used on the same drawing sheet.
I think that's full circle back to do what you need to, to communicate clearly.