×
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 tolerance callout I have never come across

Flatness tolerance callout I have never come across

Flatness tolerance callout I have never come across

(OP)
I have come about a flatness tol. never seen before. I use 1994 version, may be its in 2009. If someone can help me with this. Here is how the flatness is called out on the same surface:

The first feature control fame: "flatness symbol|0.25"
second feature control directly below it (same leader line): "flatness symbol|0.1/50"

I would really appreciate if someone can tell me what the second feature control frame means.

Ray


RE: Flatness tolerance callout I have never come across

This looks like flatness applied “on unit basis”, but something is missing.
There should be square or diameter symbol before the number 50, meaning flatness 0.1 per every 50 x 50 square (or 50 dia circle)

RE: Flatness tolerance callout I have never come across

Or it's not flatness, but rather straightness (same principle)

RE: Flatness tolerance callout I have never come across

Or it should say "50 x 50"

RE: Flatness tolerance callout I have never come across

If you look on page 162 of the 94 standard there is an example of how to specify it. The explanation is on the previous page, para. 6.4.2.1.1.

Powerhound, GDTP S-0731
Engineering Technician
Inventor 2010
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II

RE: Flatness tolerance callout I have never come across

(OP)
@powerhound, I don't have access to 94 manual, can you please elaborate your reply.

Thanks

RE: Flatness tolerance callout I have never come across

CH has it exactly.

Powerhound, GDTP S-0731
Engineering Technician
Inventor 2010
Mastercam X6
Smartcam 11.1
SSG, U.S. Army
Taji, Iraq OIF II

RE: Flatness tolerance callout I have never come across

(OP)
Thanks CH. Makes sense. I will have to check with the customer and see if it is a typo on their drawing.

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