×
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

Flatness per unit length

Flatness per unit length

Flatness per unit length

(OP)
Folks-
A vendor has told me that the flatness of a specific area on a part is 0.001 inches/inch. How would I state this requirement using a feature control frame? I don't have Y14.5.
Thanks

Tunalover

RE: Flatness per unit length

Jim,
Some questions to you:
What if required length of the area in direction of dim. 200 was 20 and not 50. How would you specify the requirement?
What if I wanted to define per unit area as 20 x full width of the part? How would you do it?

RE: Flatness per unit length

To the OP -- you need an area, not a length. So you can't really say 0.001 inch per inch. It would be OK to say 0.001 inch per 1X1 area. But make sure that's what they want.

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
http://www.gdtseminars.com

RE: Flatness per unit length

pmarc,
Neither scenario is illustrated in the standard, but I would look at using the X/Y/Z (uppercase) labels, to show the layout; in the second scenario, I would use the width dimension value rather than "full width X 20".

Flat| 0.1 / 20[X] X 90[Y]

This is an extension of principles, of course; supported by flatness per unit area AND in '09 (integrated from Y14.41 '03), the use of the X,Y,Z vectors based on drawing views. Though I haven't seen anyone do this yet, I don't see any conflict with the standard.

Jim Sykes, P.Eng, GDTP-S
Profile Services www.profileservices.ca
TecEase, Inc. www.tec-ease.com

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