×
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

TOLERANCING AN ANGULAR SURFACE WITH A BASIC ANGLE

TOLERANCING AN ANGULAR SURFACE WITH A BASIC ANGLE

TOLERANCING AN ANGULAR SURFACE WITH A BASIC ANGLE

(OP)
In the '94 std, the fig. 2-14 shows an angular surface defined by combination of linear dimension and basic angle. This figure is not shown the '09 std. Anyone knows why it is removed from '09 std?

RE: TOLERANCING AN ANGULAR SURFACE WITH A BASIC ANGLE

bxbzq,

Figure 2.14 in ASME Y14.5M-1994 does not mean a whole lot to me.

The basic dimension requires some sort of feature control frame to define the tolerance. When I do this, I tend to make both the angle and elevation basic, and I use a profile tolerance on the angle. With Figure 2.14, you could apply an angular FCF and allow lots of variation in height.

--
JHG

RE: TOLERANCING AN ANGULAR SURFACE WITH A BASIC ANGLE

It's legal because it creates a tolerance zone. There is no FCF because the height tolerance creates the width of the zone. The dimension origin symbol is essential here, though.

That said, I don't really like it myself, for two reasons. First, as drawoh mentions, it's tempting to ask where the feature control frame is. Second, it locks the height and the angle into the same tolerance, which isn't always desirable.

The 2009 standard does indeed change the wording of paragraph 2.14. They now say that profile or angularity "may" be used, which apparently doesn't prohibit the old Fig. 2-14, though it seems to be discouraged by not mentioning it.

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