ASME Y14.5 standard for Reference Dimensions?
ASME Y14.5 standard for Reference Dimensions?
(OP)
I couldn't find anything in the ASME Y14.5-2009 standard that governs the identification of reference dimensions. True, they are most commonly identified with parenthesis (1.250), but is there anything that controls this by way of actual standard?
The real application to my question is in checking a drawing, where the notes state:
1. INTERPRET DRAWING PER ASME Y14.5-2009
2. DIMENSIONS IN PARENTHESIS FOR REFERENCE ONLY
I'm trying to find out if note 2 is redundant, based on note 1.
Thanks for any input on this!
- Bill
The real application to my question is in checking a drawing, where the notes state:
1. INTERPRET DRAWING PER ASME Y14.5-2009
2. DIMENSIONS IN PARENTHESIS FOR REFERENCE ONLY
I'm trying to find out if note 2 is redundant, based on note 1.
Thanks for any input on this!
- Bill





RE: ASME Y14.5 standard for Reference Dimensions?
"The method for identifying a reference dimension (or reference data) on drawings is to enclose the dimension (or data) within parentheses. See Figs. 1-19 and 1-20."
RE: ASME Y14.5 standard for Reference Dimensions?
- Bill
RE: ASME Y14.5 standard for Reference Dimensions?
As a consolation, similar statement from ISO 8015:2011
...
8 Rules for statements in parentheses
Statements given in parentheses are only for information and do not constitute an integral part of the
specification/requirement.
...
"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future
RE: ASME Y14.5 standard for Reference Dimensions?
RE: ASME Y14.5 standard for Reference Dimensions?
RE: ASME Y14.5 standard for Reference Dimensions?
I actually stopped myself from posting a comment asking if you think the redundancy is bad. Just because it's covered in the Tome of ASME Y14.5 doesn't necessarily mean it's not valuable to place a specific comment in the notes reiterating something. For instance, I had dealt with someone asking for relief on a dimension they couldn't hold within tolerance. They were within the true position but couldn't get the linear location to work out right because it was so much tighter. It turned out they were applying the dimension tolerance from the "Unless Otherwise.." note, to a hole because of a BASIC dimension. So while they understood the feature control frame, they apparently didn't come across BASIC dimensions often enough to remember how to interpret them.
I've had the same happen regarding reference dimensions more than once, as well, even on drawings in the past that were suffixed "REF" instead of parenthesis.
Sometimes it can save time, confusion, hassle, and response-times just to have a little "risk avoidance" in a redundant comment. Just my 2 cents.
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NX8.0, Solidworks 2014, AutoCAD, Enovia V5
RE: ASME Y14.5 standard for Reference Dimensions?
RE: ASME Y14.5 standard for Reference Dimensions?
Tunalover
RE: ASME Y14.5 standard for Reference Dimensions?
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: ASME Y14.5 standard for Reference Dimensions?
RE: ASME Y14.5 standard for Reference Dimensions?
"Know the rules well, so you can break them effectively."
-Dalai Lama XIV
RE: ASME Y14.5 standard for Reference Dimensions?
In fact back in the days when I have to have deliverable items NATO codified it was essential to have the overall dimensions indicated.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: ASME Y14.5 standard for Reference Dimensions?
RE: ASME Y14.5 standard for Reference Dimensions?
If you're a company that doesn't plan on your prints being used outside of a very-majorly English speaking country then I don't think it will cause unintended consequences, at least. Otherwise...
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NX8.0, Solidworks 2014, AutoCAD, Enovia V5
RE: ASME Y14.5 standard for Reference Dimensions?
RE: ASME Y14.5 standard for Reference Dimensions?
Please, please, please, use the correct terms!They're Datum Features NOT DATUMS!!! AAAAAHAHAHAHHAHAHAHHAAAAA" -- Don Day