Dawing Revisions
Dawing Revisions
(OP)
What are the rules for drawing revisions. I am head of QC Mechanical and work with design engineers who release a drawing without a revision and will make the first change a Rev A and others that start with Rev A when releasing the drawing.





RE: Dawing Revisions
This question belongs in forum1103: Drafting Standards, GD&T & Tolerance Analysis.
I suggest you red flag this post, and repost there.
--
JHG
RE: Dawing Revisions
What standards do you work to ozzy?
From memory it's not explicitly clear in ASME Y14.100 series - Y14.35M-1997 section 5.1 says "Initial issue of a drawing does not constitute need for a revision letter and may be indicated by the use of a - (dash)."
It's been discussed before so you might find something with search e.g..
thread1103-116296: Revision Letters vs. Numbers thread1103-113692: What do you call your first revision? thread292-278425: Y14.100 Revision Method thread1103-279441: Rev A symbol on a Rev A print ??
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Dawing Revisions
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: Dawing Revisions
As head of QC I would hope you access to your company QC standards where this should be specified as a default, but can be subject to client requirements.
I would always start with a revision numbe ror letter so that it can be recorded, tracked, transmitted and referred to properly.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Dawing Revisions
I'd hope there are NO rules in the industry that are set in stone..other than a consistent process that must be used to indicate revision changes. Heck you can use "A" for your first rev and "Z1" for the next as long as the revision process is documented and can be followed.
RE: Dawing Revisions
RE: Dawing Revisions
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Dawing Revisions
"Please send me drawing 12345."
Well do you mean the original revision, or did you just forget to specify and you actually want the most recent revision?
"Received part from vendor, it is made per drawing 12345 instead of drawing 12345 rev.C"
Whoops.
RE: Dawing Revisions
Larry
RE: Dawing Revisions
RE: Dawing Revisions
I guess the discussion is staying here.
I strongly prefer that my initial release of finalized drawings is revision A, because I release preliminary drawings as part of the design discussion. I need a clear description of which drawing I have sent out at any given time.
--
JHG
RE: Dawing Revisions
This is mandatory in my company. But there are others who employ different methods that allow approved vendors to their website and dictate own us on that vendor to check for latest revision compliance. So only the vendor and parties having privileges can access revised drawings. I find this extremely controlling and unnecessarily a make work program, but it is ISO compliant with state of the art QC/QA policy.
I believe the print should stand alone and have information relating to that manufacturing detail. My employees know that if a machinist needs to ask someone, stop his work to reference a book or other document, then the print has failed. That is my policy, period.
It works quite well, I may add.
Regards,
Cockroach
RE: Dawing Revisions
Our procedure is we need to start the DWG rev with A,B ,C and so on until the DWG is ready for PE stamp / issue for construction (IFC).
Once it is PE stamped / Issued for construction (IFC) the rev numbering need to change to 1,2,3 and so no..
One more thing whenever you change rev. need to cloud the changes for easy identification.
once construction completed, the DWG need to be prepared as built DWG with final rev number.
RE: Dawing Revisions
first release is rev A entitled original issue.
subsequent releases are rev B, C, D.
when issued for construction it is changed to Rev 0 issued for construction and all previous revs are removed.
when I say removed I really mean layers frozen or off.
the drawing only ever shows one set of Rev numbers and clouds - the latest one.
RE: Dawing Revisions
Ozzy1, if you are the "head of QC Mechanical" then don't you have the luxury of laying down the law?
"Art without engineering is dreaming; Engineering without art is calculating."
Have you read FAQ731-376: Eng-Tips.com Forum Policies: Eng-Tips.com Forum Policies to make the best use of these Forums?
RE: Dawing Revisions
RE: Dawing Revisions
In PDMLink, all designers work in the Design State. We then release ro Pre-Release state all numeric revisions. When it moves to production, the state is Released. PDMLink prevents a designer from modifying any files at either Pre-Release or Release state.
"Wildfires are dangerous, hard to control, and economically catastrophic."
Ben Loosli
RE: Dawing Revisions
RE: Dawing Revisions
Files get sorted on the hard drive in alpha-numeric order so strange things happen.
It hasn't happened yet, but some rookie is going to come along and forget the other rule that you skip revision "I" between rev "H" and "J", and the confusion will get even worse.
My personal preference is to make sure the revision is a letter, and keep drawings ordered solely by number. If the drawings are organized with alphabetic designations, then a number to track the revisions stands out more. Letter drawing names invites wild imagination into file name conventions so avoid it. Make sure to use computer file names that equate the file name to the drawing number and revision. Do it in a way that the operating system can naturally sort them in a reasonable order. Do this even if you have a data management system or database that tracks this for you, because somebody has to manage the database.
It is not difficult to create a system that tracks, and isolates, the preliminaries that have been released before the drawings are approved. If the company has a data management system database, this may be an impediment to issuing prelims, but on the other hand, the prelims don't have to be made distinct from the approved drawings, if there is a "master drawing" or list that defines at what revision status each drawing becomes approved. Implying that any earlier revisions were not approved, just drafts.
STF