I, O, Q, S, X and Z Revision Letters
I, O, Q, S, X and Z Revision Letters
(OP)
Hey everone - I am fairly new to mechanical engineering field (Architecture for a long time) and have a quick question. As good practice, we avoided using 1, 0, I and O on our building gridline layout. I realize I, O, Q, S, X and Z are not allowed but ASME Y14.35M for revisions...but in a digital age, is this really relevent any longer? Do you allow them at your company (or have you considered)?
Thanks...Bunyan in CA
Thanks...Bunyan in CA





RE: I, O, Q, S, X and Z Revision Letters
If not following Y14.35M I would certainly avoid I, O and Q, I feel avoiding the others is not as important. In my particular class of work, revisions are numbered, not lettered.
And what does the digital age have to do with it? I find screens often harder to read than paper, of which there is plenty around still and will be for the foreseeable future.
Regards,
Mike
RE: I, O, Q, S, X and Z Revision Letters
--Scott
www.wertel.pro
RE: I, O, Q, S, X and Z Revision Letters
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: I, O, Q, S, X and Z Revision Letters
While I agree that with humans reading drawings is a very important consideration, wouldnt proper application of a font style prevent misreading/confusing those characters (e.g., zero with a diagonal line cannot be confused with an O). When lettering was done by hand it was probably more important as the fonts would have variation from person to person. Digital application of fonts would make it easier to read...not harder.
BTW, from a good practices standpoint we may continue to not use these letters...I am simply conducting a thorough review.
Thanks again for your thoughful responses...Bunyan in CA
RE: I, O, Q, S, X and Z Revision Letters
It's just not worth the risk IMO.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?