Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

  • Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Surface Profile on Datum Feature

Status
Not open for further replies.

trinhhle

Mechanical
Nov 16, 2011
9
I was curious how Figure 11-21 on ASME Y14.5-2018 would be interpreted in ASME Y14.5-1994.

I believe the total width in this case at at given point is 60.0 +0.4/-0.8 for 2018. Is this correct and is it true for 1994?

Is the statement below from 2018 true for 1994?

11.4.3.1 When the Toleranced Feature Is a Nonsize
Datum Feature. At the datum feature, the distance to
the true profile is zero. Since the datum feature may
not pass through the datum plane, the tolerance on the
considered feature shall be as follows:
(a) For an equal bilateral profile tolerance, half of the
profile tolerance is available for variation of the datum
feature. See Figure 11-21.
(b) For a unilateral profile tolerance, the tolerance may
only be applied into the material of the feature.
 
Replies continue below

Recommended for you

tinhhle,

I don't believe the interpretation of 11-21 would change in 1994/2009/2018 - this was pretty much the consensus on how to interpret it, it just wasn't explicitly written in the standard. It has now been codified in the standard with 2018.
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor