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REVISION SYMBOLS 2

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Enginerd9

Enginerd9

Mechanical
Jan 11, 2008
149

This old thread has been closed, unfortunately, but I wanted to put something out there for you all...

I've never had much experience with that whole "level I, II, and III" stuff, but revision symbols I am quite familiar with. Simply put, they are a symbolic reference to the specific items in the drawing view which correspond with the revision table. For example, if your "Rev C" notes in your revision table say "3.50 was 4.00," you'd place a symbol with the letter "C" inside it next to that specific dimension.

I have also found that the generally accepted symbol to use is a triangle. I don't know if that's just a SolidWorks default and nobody's bothered to change it, and some shops don't know what it is until you tell them... but it's what I've been using for years now.

Anyway, someone please let me know if you find a standard which tells you specifically what kind of symbol to use, etc.

Thanks!
 
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I have never seen a standard for revision symbols. I've seen triangles, circles, and hexagons over the years at various companies and industries. The Triangle is the most common that I have seen though.

"Art without engineering is dreaming; Engineering without art is calculating."

Have you read faq731-376 to make the best use of these Forums?
 
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The system that you describe is exactly what we use and we have long used Unigraphics; so its not a Solidworks specific technique. This is also the method I see on all of the GE prints that I deal with. I find it to be clear and very workable.
 
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Like MM, I have seen various symbols used for this purpose. I have seen small circle used most often myself, but I don't think there is an official standard specifying which shape is to be used. The common property of these symbols seems to be their reduced size when compared to other symbols, such as flagged notes or item balloons.

"Good to know you got shoes to wear when you find the floor." - [small]Robert Hunter[/small]
 
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Triangle is most common as I understand it because it is also the capital version of the Greek 'Delta' which is commonly used to mean 'change in' - as in calculus.

So the triangle, means Delta, means change.

I've never actually used them, seemed like a lot extra effort and potential to be introduce mistakes at the next ref etc. My preference is to list the sheet & grid size where ever I'm detailing what the change was be it rev block or ECO or whatever you call it.

Posting guidelines faq731-376 (probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​
 
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If I understand the question correctly, I'll provide information from Revision of Engineering Drawings and Associated Document ASME Y14.5-35M-1997. Paragraph 5.4 has instructions on revision symbols and how to handle the identification of multiple changes within the same revision. The only symbol shape mentioned in the standard is that of a circle, which may either be places near the change or even with an arrow pointing to the changed item.

Matt Lorono
Lorono's SolidWorks Resources & SolidWorks Legion

http://groups.yahoo.com/group/solidworks & http://twitter.com/fcsuper
 
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Matt,
Thanks for the info. You say that the only shape mentioned is the circle... Is the circle specified, or is it only used as an example?

"Good to know you got shoes to wear when you find the floor." - [small]Robert Hunter[/small]
 
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5.4
"The revision symbol may be used to identify an item or area of change on the drawing. The symbol should be placed at or near the location affected by the change."

"When a revision symbol is used, the revision letter, and the sequence number when used, shall be enclosed in a circle to form a revision symbol."

"On drawings where use of revision symbols may conflict with other symbols used on the drawing creating a possible misinterpretation, the revision description will be adequate."

There's more, but that's the pertinent wording. I would say that I do see room for improvement on this section, as I do not see why one needs to be limited to using a circle or nothing at all.

In my opinion, if you do wish to use another symbol, you can. Simply define that symbol directly on your drawing (perhaps in the title block). Any exceptions to the ASME standards should always be clearly explained on the drawing or at least in some referenced document that is provided along with the drawing.

Matt Lorono
Lorono's SolidWorks Resources & SolidWorks Legion

http://groups.yahoo.com/group/solidworks & http://twitter.com/fcsuper
 
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Matt,

Thanks! That's very helpful, and it explains why we don't use revision symbols here as our standard. We use circles to denote item numbers, so I assume long ago we did away with revision symbols and left the description as adequate revision communication.

But, I don't think we'll be fined for using triangles if we really wanted to. lol

Thanks!
 
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Thanks again, Matt! It's good to know where the stds stand on things sometimes, whether we choose to follow or not.

"Good to know you got shoes to wear when you find the floor." - [small]Robert Hunter[/small]
 
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BTW, I just submitted a request to cs@asme.org. I suggest anyone else also make this request.

Dear Committee Members,

I have a request for a change to Revision of Engineering Drawings and Associated Documents ASME Y14.35M-1997 that may improve the flexibility of the standard.

For Paragraph 5.4, I would like to ask for the inclusion of other shapes for revision symbols (particularly, I request: delta, hexagon, and box). I would also like to suggest that the wording of this paragraph be simplified for clarity, as follows (comments in brackets[]):

5.4 Revision Symbol

The revision symbol may be used to identify an item or area of change on the drawing. The symbol should be placed at or near the location affected by the change. A single revision symbol may be used to identify multiple changes within one area. See Fig 5.1 [same figure currently called Fig 5].

5.4.1 Symbol Application

Where a revision symbol is used, the revision letter, and the sequence number when used, shall be enclosed in a circle, triangle, square or hexagon. See Fig 5.2 [a new figure that shows all the symbols]. One or more leaders may be used to indicate a specific location. See Fig. 5.1 (a), (b), (c) and (d) [same figure currently called Fig 5].

5.4.2 Omitting Symbols

[Remove this section for three reasons. First, the use of revision symbols is not a requirement. Second, with the inclusion of more symbol shapes, the conflict condition isn't likely. Third, the reliance on the revision description is self-evidence when taken in context of the Y14.35 standard on the whole.]

Matt Lorono
Lorono's SolidWorks Resources & SolidWorks Legion

http://groups.yahoo.com/group/solidworks & http://twitter.com/fcsuper
 
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Matt,

I am encouraged. I will submit that same request.

-brad
 
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It's a square with a circle in it.

Common on certain defense companies drawings - especially Hughes as I understand it.

Posting guidelines faq731-376 (probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​
 
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Hang on, I'd think the wording somewhere should make it clear that the symbol used for rev should be unique and not confused with symbols like flag notes or item call outs etc.

Posting guidelines faq731-376 (probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484​
 
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