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!

*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.

Jobs

Form, Fit, or Function

Form, Fit, or Function

(OP)
Hello to all,
This is my first post here! I wanted to start off by thanking the community for this chance to discuss a few topics that has come up a few times already.

So I have been designing for 17 years now in the fields of Mechanical machine parts and assemblies, MEP, and Architecture disciplines. Just recently the company which I have been with of going on 5 yrs, has been looking at setting up standards for ECO process and revising drawings. We had a large debate on when to revise or create a new P/N for changing parts. I have always worked off the three "F"'s. To my surprise, ANSI does not follow that. My question is "how was I misled this whole time or did the standard change when ASME and ANSI combined?

All of my experience says to revise a drawing if there is a change to the Form, Fit, or Function of a given part. ANSI states if a part is not backward compatible then is gets a new part number not a new revision.

What are the thoughts of this community?

Nathan Gardner
Mechanical Designer / CAD Admin
Wood Carver - Cheese Maker - Goat Farmer

RE: Form, Fit, or Function

If a part is not backwards compatible, then it is considered a new part and should get a new part number. You are correct too, if FFF changes it should always be revised. The caveat is that some FFF changes should require a new part number as well. I also think it matters if you are building one-off products or not. Example: a safety bar that is 32" long, and it is rev'd to 32.5" long. Customer order new bar and complains it doesn't fit. That change should have triggered a new part number.

"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?

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


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close