ASME Standards for the Revision of Engineering Drawings
American Society of Mechanical Engineers standard ASME Y14.35M was issued in 1997 to describe the ASME approved format for tracking revisions and other changes to engineering drawings. ASME Y14.35M was reaffirmed in 2003, and no changes were made at that time. It updated to the name ASME Y14.35 in 2014.
What does ASME Std Y14.35 mandate?
ASME Y14.35M Standard
ASME Y14.35M and the later ASME Y14.35 standard allows for changes to be made to drawings by adding and crossing out information on a drawing or by creating a new drawing revision.
The ASME drawing standards state that new drawings can be recorded as a new revision letter or as a new drawing number that supersedes the old one. The replaced drawing will be modified to note “replaced with change by drawing 1234567”. This ensures configuration management and product verification is handled correctly.
The first version of a drawing is identified by a revision dash “-“. After that, revision letters are used. Revision letters can be a single letter up to multiple letters.
All letters can be used as revision letters except I, O, Q, S, X and Z. These letters are not allowed because they can be mistaken for numbers or for other letters. For example, a revision letter I can be mistaken for a 1 while an S can be mistaken for a 5. Revision letters must also be uppercase, to minimize confusion between a lowercase "l" and "1" and "I".
After the end of the revision letter sequence is used up, the next letter is added to the end. Revision letter Y is followed by revision AA. Revision AY is followed by BA. Revision DY is followed EA.
However, revision letters are not allowed to exceed two characters, so there is no revision greater than YY. At this point, you should issue a new drawing number.
Revision columns are located in the upper right corner or next to drawing the title block. Revision columns include the revision letter of the drawing, a short description of the changes made between this revision and the prior one, and the date the revision was made or the revised drawing was approved. Revision columns frequently include the drafter who made the latest revisions.
ASME standard Y14.24 gives readers a list of when ASME engineering drawing standards like ASME Y14.35 apply. ASME Y14.1 defines the acceptable form of the revision history block.
ASME Y14.1 gives the ASME standard size and format used in engineering drawings.
ASME Y14.2 outlines the accepted line conventions and lettering used on engineering drawings. ASME Y14.3M describes the accepted forms of single, multiple and sectional views used on engineering drawings.
ASME Y14.100 provides a list of standard engineering drawing practices recommended by the ASME. Depending on the customer or project, other ASME or ISO standards may also be required. And ASME drawing standards do not cover documentation control or configuration management at all.
Questions & Answers
If you have to update the drawing to a new revision, do you still leave the symbols of the old revision on the changes you made on the drawing and just add the new ones?
You have to have a record of the changes to the document SOMEWHERE. In newer product data management systems, you can simply change the revision from C to D and note the changes that go with revision D while the system tracks all the changes associated with earlier revisions. At least mention in the notes for revision D what changed so that those who see the new document know what has changed.Helpful 1
Does the ASME drawing standard allow skipping item numbers in a bill of material?
Allow, yes. However, you need to take care that you account for the skipped numbers so that people know it isn't an oversight.
Should engineering drawings be numbered as Rev 1 or Rev 01?
01, because you can end up with 28 revisions.Helpful 7
If you have an assembly and need to revise a sub-component of the assembly for a typo on the drawing would that require the top assembly drawing do be revised as well? The change would not affect fit, form, or function of the top assembly.Helpful 1
Is the ASME standard rev1 or should it be REV1 when naming the file?
I've seen it written as both "Rev" and "REV".Helpful 3