×
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

Limits and fits

Limits and fits

Limits and fits

(OP)
Hi, what is the correct way to dimension upper and lower limits for holes on a drawing. Should the MMC be above LMC? OR the higher value be above the lower.I prefer the latter to avoid confusion but I have been told that the former is the correct way.Please advise  

RE: Limits and fits

The higher number above the lower number; doesn't matter whether it's a hole or a pin.

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

RE: Limits and fits

Depends on which drawing standard you use.  I worked for a company once that put the first value a machinist would approach on top.  So if he was drilling a hole, the lower value went on top.  That's definitely old school these days and that company no longer exists (I don't think that's the reason but using proprietary standards didn't help).

The point is, no one can tell you what is right or wrong until you tell use what standard you are using.

RE: Limits and fits

Per Y14.5M-1994 Sec 2.2 page 24
The high limit (maximum value) is placed above the low limit (minimum value). When expressed in a single line, the low limit precedes the high limit and a dash separates the two values.

You may also find it on Y14.5-2009 Sec. 2.2 at page 24 as well.

SeasonLee
 

RE: Limits and fits

(OP)
Great thanks guys.
 

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