Revision Letters vs. Numbers
Revision Letters vs. Numbers
(OP)
I cannot find standards documentation on pre-production vs. production revision labeling. Does ANSI standards state a lettering vs. numbering preference?
Thank you, this website has been very helpful!
Thank you, this website has been very helpful!





RE: Revision Letters vs. Numbers
The only thing we have found is if you use letters, you skip I,O,Q,S,Z since they could look like numbers. We are adapting an Alpha revision scheme and ignoring the skipped letter preference; straigh A-Z, AA-ZZ.
"Wildfires are dangerous, hard to control, and economically catastrophic."
"Fixed in the next release" should replace "Product First" as the PTC slogan.
Ben Loosli
CAD/CAM System Analyst
Ingersoll-Rand
RE: Revision Letters vs. Numbers
Chris
Sr. Mechanical Designer, CAD
SolidWorks 05 SP0.1 / PDMWorks 05
ctopher's home site
RE: Revision Letters vs. Numbers
Method #1 - use +A, +B, +C, etc.
Method #2 - use 1, 2, 3, etc...
Steve Smith, C.I.D.
Product Engineer
Staco Energy Products Co.
www.stacoenergy.com
RE: Revision Letters vs. Numbers
I have never seen that before.
Chris
Sr. Mechanical Designer, CAD
SolidWorks 05 SP0.1 / PDMWorks 05
ctopher's home site
RE: Revision Letters vs. Numbers
Steve Smith, C.I.D.
Product Engineer
Staco Energy Products Co.
www.stacoenergy.com
RE: Revision Letters vs. Numbers
Chris
Sr. Mechanical Designer, CAD
SolidWorks 05 SP0.1 / PDMWorks 05
ctopher's home site
RE: Revision Letters vs. Numbers
SWCADMAN
RE: Revision Letters vs. Numbers
We use the same X numbers for R and D work and A,B,C for the revs. Though the skipped number reference I,O,Q,S,Z was unknown here...thanks looslib..
-mechantaeus
RE: Revision Letters vs. Numbers
Don Peckham
RE: Revision Letters vs. Numbers
Chris
Sr. Mechanical Designer, CAD
SolidWorks 05 SP1.1 / PDMWorks 05
ctopher's home site
RE: Revision Letters vs. Numbers
Which industry? What spec?
RE: Revision Letters vs. Numbers
Drawing Requirements Manual
It references ASME Y14.35M
Chris
Sr. Mechanical Designer, CAD
SolidWorks 05 SP1.1 / PDMWorks 05
ctopher's home site
RE: Revision Letters vs. Numbers
Thanks for the info. Now I have a valid argument why "-" is prefered over "A" for initial file releases. Our QA dept (which oversees the Document and Data Control dept here) recently changed our procedures from using "-" to using "A", and I have yet to see the justification for it.
Eric
RE: Revision Letters vs. Numbers
Chris
Sr. Mechanical Designer, CAD
SolidWorks 05 SP1.1 / PDMWorks 05
ctopher's home site
RE: Revision Letters vs. Numbers
ASME Y14.35M-1997
Section 5 Identfying Revisions on Drawings
5.1 Revision Letters
Upper case letters shall be used in sequence beginning with A and omitting letters "I"O", "Q", "X", and "Z". When the single letters have been exhausted, the revisions following "Y" shall be "AA", "AB" through"AY". Should "AA" to "AY" be exhausted, the next sequence shall be "BA", "BB", etc. Revision letters shall not exceed two characters. Initial issue of a drawing does not constitute need for a a revision letter and may be indicated by the use of a - (dash).
there is more, but this covers the basic principles.
"Wildfires are dangerous, hard to control, and economically catastrophic."
"Fixed in the next release" should replace "Product First" as the PTC slogan.
Ben Loosli
CAD/CAM System Analyst
Ingersoll-Rand
RE: Revision Letters vs. Numbers
RE: Revision Letters vs. Numbers
For what it is worth.............
I have always seen letters for prerelease (design and design review phase) and numbers (starting with 0) for Issue for Construction (or Fabrication)
jjf
RE: Revision Letters vs. Numbers
The "may be indicated" didn't sink your arguement. What the spec says is that the first REVISION starts with an A. Initial release MAY start with a "-" dash.
In other words, initial release may be nothing at all, as in no information in the revision block. It does not say the initial release can be an A.
--Scott
For some pleasure reading, try FAQ731-376
RE: Revision Letters vs. Numbers
RE: Revision Letters vs. Numbers
Whether you use the '-' or 'A' to signify project release, how do you convert all your files that currently have 'X' series revisions? Individually? We typically have several hundred files per project, and this would take many hours.
Also, a question for Don Peckham: What settings do you have that allow higher revision numbers for R&D than for production? My UG assemblies always assume the highest number / letter as the latest revision, and the numeric series supersedes the alpha series. Just curious how you made this work.
-Rod
RE: Revision Letters vs. Numbers
Chris
Sr. Mechanical Designer, CAD
SolidWorks 05 SP1.1 / PDMWorks 05
ctopher's home site
RE: Revision Letters vs. Numbers
You are right, doing it manually does take time, maybe even weeks depending on the scale of the release.
"I think there is a world market for maybe five computers."
Thomas Watson, chairman of IBM, 1943.
Have you read FAQ731-376 to make the best use of Eng-Tips Forums?
RE: Revision Letters vs. Numbers
I agree that UG cannot do what Don says in native mode, but where does Don say he uses UG with or without Teamcenter? I can do what Don what says with Pro/E and Intralink.
What do you mean by "convert all your files"? Do you have the revision as part of the file naming convention? If so, just saveas to the new revision.
"Wildfires are dangerous, hard to control, and economically catastrophic."
"Fixed in the next release" should replace "Product First" as the PTC slogan.
Ben Loosli
CAD/CAM System Analyst
Ingersoll-Rand