×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Avoiding Redundacy

Avoiding Redundacy

Avoiding Redundacy

(OP)
Can anyone point me to a chapter and verse in any dwg standard (prefereably ASME 14.5) that provides guidance on avoiding redundany in standard dwg practice? i.e. FNs on an assy dwg... If used more than once, the redundancy is noted as a "reference" and this is in the case that it IS needed... What if something is not needed? Such as a view, etc... Is there some sort of general wording that conveys "avoid redundacy to increase clarity and chances for mistakes"?

RE: Avoiding Redundacy

Page 4
NOTE: A reference dimension is a repeat of a dimension or is
derived from other values shown on the drawing or on related
drawings. It is considered auxiliary information and does not govern
production or inspection operations. See Figs. 1-19 and 1-20.
Where a basic dimension is repeated on a drawing, it need not be
identified as reference. For information on how to indicate a reference
dimension, see para 1.7.6.


Page 8

(c) Each necessary dimension of an end product shall
be shown. No more dimensions than those necessary for
complete definition shall be given. The use of reference
dimensions on a drawing should be minimized.




RE: Avoiding Redundacy

Not every sound practice is invoked by standards. It's just good drafting practice to avoid redundancies. Along the same lines, I don't think you'll find a standard that says to never dimension to a hidden line. That is just good drafting practice. Maybe a drafting room manual will spell it out but I'm certain it's not covered in any ASME standards.

Tunalover

RE: Avoiding Redundacy

Y14.3-2012 ¶7.2
"The minimum number of views necessary to describe the part is shown."

“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV

RE: Avoiding Redundacy

ewh, must be nice to have all the ASME specs. They're so expensive!

Tunalover

RE: Avoiding Redundacy

One of the perks of working for a huge company. The trouble is getting the right people to actual read them!

“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV

RE: Avoiding Redundacy

The reference issue on find number balloons is not in the ASME standards as far as I know, and in my opinion isn't correct anyway but I can't give chapter & verse why.

Tuna - I'm pretty sure not dimensioning to hidden line is in one of the stds but off the top of my head I can't remember which.

Posting guidelines FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm? (probably not aimed specifically at you)
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?

RE: Avoiding Redundacy

Kenat- A lot of people get caught in the trap of proving every drafting practice by pointing to a passage in a standard. There are things that are taught on-the-job and in drafting courses that I call "good practices" that aren't always delineated in a DRM or standard. On the other hand, it IS nice to know that a practice you hold true is documented somewhere. As an engineer most of my drafting knowledge was picked up on-the-job but you'd be amazed at the things that so-called educated designers and draftsmen do that runs counter to good drafting practice (like dimensioning to a hidden line). A lot of people get used to doing it a wrong way and continue to do so saying "that's the way we've always done it." I'm sure I'm preaching to the choir. :)

Tunalover

RE: Avoiding Redundacy

Quote (kenat)

Tuna - I'm pretty sure not dimensioning to hidden line is in one of the stds but off the top of my head I can't remember which.

It's in Y14.5M-1994, section 1.4(g)

(g) Dimensions should be arranged to provide required
information for optimum readability. Dimensions
should be shown in true profile views and refer
to visible outlines
.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources