Name of ASME Document Governing "Dimensioning"
Name of ASME Document Governing "Dimensioning"
(OP)
I am constantly told by people I work with, who are quick to ponit out how much more experience than me they have, that ASME Y14.5-2009 is Geometric dimensioning AND TOLERANCING and not a document about how to be a drafter. I can sort of understand where they're coming from, but am of the opinion that they're totally wrong.
First of all, the document itself says that it supersedes all other specs cited within it, which includes the specs that supposedly govern 'drafting practices'. Seconly, I still haven't found any other document that explains that an angle must start from it's axis of rotation (this is what my checker tells me - this is a plastic, injection molded part), or that a dimension should always have the arrows inside when possible or that two adjacent dimensions should be offset, and not ever share an arrow.
Can anyone tell me which spec covers these things? Because in the past I've always relies on 14.5 and the examples within... Now I'm being told that it's insufficient and that only having knowledge of the 'old way' of drafting is going to be beneficial... or some garbage like that.
Anyway, which ASME spec tells you how to draft? I always thought it was a bunch of theory
Thanks!
First of all, the document itself says that it supersedes all other specs cited within it, which includes the specs that supposedly govern 'drafting practices'. Seconly, I still haven't found any other document that explains that an angle must start from it's axis of rotation (this is what my checker tells me - this is a plastic, injection molded part), or that a dimension should always have the arrows inside when possible or that two adjacent dimensions should be offset, and not ever share an arrow.
Can anyone tell me which spec covers these things? Because in the past I've always relies on 14.5 and the examples within... Now I'm being told that it's insufficient and that only having knowledge of the 'old way' of drafting is going to be beneficial... or some garbage like that.
Anyway, which ASME spec tells you how to draft? I always thought it was a bunch of theory
Thanks!
I'm not a vegetarian because I dislike meat... I'm a vegetarian because I HATE plants!!





RE: Name of ASME Document Governing "Dimensioning"
Considering "knowledge of the 'old way' of drafting" as garbage is unfortunate.
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: Name of ASME Document Governing "Dimensioning"
Here are some: FAQ1103-1039: What are some ANSI/ASME standards I should use?
RE: Name of ASME Document Governing "Dimensioning"
Any idea what I'm talking about here?
I'm not a vegetarian because I dislike meat... I'm a vegetarian because I HATE plants!!
RE: Name of ASME Document Governing "Dimensioning"
Mike Halloran
Pembroke Pines, FL, USA
RE: Name of ASME Document Governing "Dimensioning"
Ask your "checker" to produce actual document that he is following and listen to the sound of crickets.
RE: Name of ASME Document Governing "Dimensioning"
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: Name of ASME Document Governing "Dimensioning"
Check out MIL-STD-100.
Chris
SolidWorks 13
ctopher's home
SolidWorks Legion
RE: Name of ASME Document Governing "Dimensioning"
I don't remember MIL-STD-100 being any more detailed as far as dimensioning, but I may be mistaken.
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: Name of ASME Document Governing "Dimensioning"
Genium Manual: http://www.draftingzone.com/shoppingzone/
and
DRM: http://www.amazon.com/Drawing-Requirements-Manual-...
Like it or not, both of them based on about the same stack of ASME standards. Both, unfortunately, got stuck in 2008.
RE: Name of ASME Document Governing "Dimensioning"
However, if they do have additional requirements for drafting beyond what section 1 of Y14.5 and the little bits related docs give then they should have some kind of specification to reference - even if it's a fairly informal list or a preferred drafting book or something.
When I was checking I tried to be careful not to arbitrarily impose my preferences, and certainly not to hold up drawings or make a lot of extra work to do so. When it came to things that would stop me approving a drawing I tried to stick to the relevant Y14 series docs and to the things our DRM clarifies plus of course the universal get out of making sure it's a generally clear and easy to understand drawing.
However, I would sometimes suggest what I considered good practices to be used on future drawings.
I think some of the limitations of 14.5 may be a result of it effectively being a consensus document, so some stuff not easily agreed on by those drafting & editing it probably tended to get left out rather than resolved.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Name of ASME Document Governing "Dimensioning"
I knew there was a replacement, but didn't go far enough to look it up.
I think the MIL std may be a free download somewhere to use as a start.
Chris
SolidWorks 13
ctopher's home
SolidWorks Legion
RE: Name of ASME Document Governing "Dimensioning"
I'm not a vegetarian because I dislike meat... I'm a vegetarian because I HATE plants!!
RE: Name of ASME Document Governing "Dimensioning"
I think a good checker has to be a good teacher as well. Or at least, not a completely coarse and offensive person. The boss says that she's 'good' at what she does because she doesn't back down from what she believes... If that's the only virtue to being a checker, than I need to go back to school and get out of drafting. I've read 14.5 a number of times so that I feel I know how a good drawing is put together (along with 12+ years of experience)... If that's all thrown out the window based on some tribal knowledge than a lot of that work was wasted time apparently.
I'm not a vegetarian because I dislike meat... I'm a vegetarian because I HATE plants!!
RE: Name of ASME Document Governing "Dimensioning"
The title of my copy of ASME Y14.5-2009 is "Dimensioning and Tolerancing". This thing is a standard, and it explains what all those dimensioning and tolerancing symbols and notations mean. Given this standard, or any other standard for that matter, it means that everyone is speaking the same language.
GD&T is a subset of dimensioning and tolerancing.
--
JHG
RE: Name of ASME Document Governing "Dimensioning"
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: Name of ASME Document Governing "Dimensioning"
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: Name of ASME Document Governing "Dimensioning"
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: Name of ASME Document Governing "Dimensioning"
Is there a specific drafting technique that is in question? If so, why don't you tell us what the conflict is and we can add our input in order to further complicate things...
John Acosta, GDTP S-0731
Engineering Technician
Inventor 2013
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II
RE: Name of ASME Document Governing "Dimensioning"
Matt Lorono, CSWP
Product Definition Specialist, DS SolidWorks Corp
Personal sites:
Lorono's SolidWorks Resources & SolidWorks Legion
RE: Name of ASME Document Governing "Dimensioning"
"What you, and many others want, is the standard to say there is only "one way". My impression is the standard is intended to give multiple ways of solving a problem so people can find the one that is right for their particular application."
I agree with CH, what people really is something that says their way is right.
If you read the preface to the Y14.5M-2009 standard it basically says: "the old way of dimensioning was not good enough". Not many want to here that!
Frank
PS
Thanks to my friends here, I know that now ISO 14495 says it too!
RE: Name of ASME Document Governing "Dimensioning"
Add a note to the drawing. Create an amendment. Let it be “your rules”. But write them down and take responsibility.
Otherwise it’s like police pulling you over for running imaginary stop sign.
“The sign is where I think it is” – even the most law-abiding citizens will not keep up with that.
RE: Name of ASME Document Governing "Dimensioning"
Frank
RE: Name of ASME Document Governing "Dimensioning"
I didn't say "speaking it well."
There is all sorts of good drafting practise that is outside the scope of ASME Y14.5. Given the standard, there generally are multiple ways of doing everything, and multiple requirements.
--
JHG
RE: Name of ASME Document Governing "Dimensioning"
Yes; DRM's are written to remove some of that ambiguity. No DRM is going to be perfect. Their purpose is to tailor drafting practices to meet the needs of that organization.
I agree. Exceptions should be allowed based on the situation, but enforced rules should be documented.
I agree for the most part. The OP is asking about documentation of preferential practices. I have not found any mention in the standard of an angle having to start from its axis of rotation, and his checker's preference that two adjacent dimensions should be offset, and not ever share an arrow actually goes against the standard. These are the sort of practices that beg to be documented in a supplemental company DRM, as relying only on a checker's undocumented preferences can not be sustained. No one is perfect and no one lives forever.
One area in the standards that seems to be lacking is in Y14.3 MULTIVIEW AND SECTIONAL VIEW DRAWINGS... is an orthographic projected view from a section (full, half or partial) view allowed? The standard addresses taking a section from a section, but that's about it. I am struggling to find support in the standard for prohiting such views as this goes against what I was taught, but this practice is very common where I work (the "DRM" already takes exception to the section-from-section rule). I feel I am going to lose this argument without a documented source for prohiting this practice.
“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
RE: Name of ASME Document Governing "Dimensioning"
Frank