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ASME Y14.5M-(2008)? 2

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There are some comments here -> thread1103-193502

I see that spotface is getting it's own symbol, a counterbore symbol with "SF" in it.

Has the new Profile modifier symbol (per Y14.41-2003) been included?

Believe it if you need it or leave it if you dare. - [small]Robert Hunter[/small]
 
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:) I know about that thread. I posted it in myself. There's not really any content in it. I figured I'd asked directly about it, now that the draft has been out a while; and also to see if anyone else had comments about 1994 that they hope is changed.

Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group
 
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My understanding is that they've been fighting the SF battle a long time. Looks like the spotfacers won this round. :)

I did hear that many of the tough decisions where put off until next time, so this update may not be all the much different. I haven't see it though.


Matt Lorono
CAD Engineer/ECN Analyst
Silicon Valley, CA
Lorono's SolidWorks Resources
Co-moderator of Solidworks Yahoo! Group
and Mechnical.Engineering Yahoo! Group
 
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The definition for profile is consistent with 14.41-2003 in that it uses the U modifier instead of phantom lines to define unequal bi-lateral tolerance zones. That a welcome change IMHO.

Powerhound, GDTP T-0419
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Inventor 2008
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Great! I was hoping that they wouldn't overlook that.

Believe it if you need it or leave it if you dare. - [small]Robert Hunter[/small]
 
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CBORE has a depth noted, SF is minimum depth to achieve flat surface of noted diameter.

Believe it if you need it or leave it if you dare. - [small]Robert Hunter[/small]
 
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2008 PROPOSED GD&T TIPS
Summary of Changes
by Gary Whitmire

A proposed new Y14.5 Geometric Dimensioning and Tolerancing Standard has just been officially released for comments. If past practice is any guide, this draft will become the new standard in a few months. This standard will replace the 1994 GD&T Standard. It is expected that all organizations which now use the 1994 Standard will eventually switch to this 2008 GD&T Standard. The proposed standard itself is 264 pages long, so following is a summary of a few of the changes from the 1994 Standard:
A. There are new symbols and dimensioning conventions for:
• All Over as used in Profile Control
• Continuous Features
• Independency
• Unequally-disposed Tolerance Zone
• Moveable Datum Target
• Datum Translation
B. There is a guide to the six degrees of freedom for datums
C. Non-perpendicularity of intersecting surfaces is addressed
D. There is a change under Spotface
E. Basic dimensions are clarified
F. There is a clarification on Limit of Size
G. There is a change to Rule 1
H. Tolerance of position has been reformatted
I. Dimensions defined by CAD data have been addressed
J. The effect of datum references in positional tolerances is explained in degrees of freedom
K. Control of coaxial features is addressed
L. There are new boundary methods
M. There are a number of new terms, including:
• Maximum Material Boundary (MMB)
• Least Material Boundary (LMB)
• True Geometric Counterpart (TGC)
• Regardless of Feature Boundary (RMB)
• Degrees of Freedom (DOF)
N. There are twenty (20) new definitions
O. A contoured surface can be a datum
P. There is a new datum symbol placement requirement
Q. There is a new leader line symbol

 
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OK, now I'm confused. I thought a contoured surface could already be used as a datum, as long as it was tied down to the three primary datums (para 4.5.10.1). Is it now going to be allowed as a primary datum?
I am eager to look the new standard over, though I'm not so sure how eager I am in implementing it.[bigears]

Believe it if you need it or leave it if you dare. - [small]Robert Hunter[/small]
 
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They have greatly expanded the use of a Contoured Datum. It is still shown as a secondary datum only but using it at:
RMB & MMB. It is allowing for what I would of called Shift.
 
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Where is the draft of the Y14.5 available for purchase please? Anyone?
 
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Draft is no longer for sale/review from SAE untill new Standard is released December this year or early 2009.
 
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In the new ASME Y14.5 DRAFT @ 4.12.7 Translation Modifier. "When it is necessary to indicate that the basic location of the TGC is unlocked and the TGC is able to translate within specified geometric control to fully engage the feature, the translation modifier is added to the feature control frame following the datum feature referenced and any other applicable modifiers. When the translation modifer is applicable, and direction of movement is not clear, movement requirements shall be specifed."

What is that all about? Can anybody give me a clear explanation of what they are realy after? Is that similar to Datum Shift? And when is it not clear? or when is it clear? Any Help?
 
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I have a question, based on the summary as posted by Brandy7. Is there truly 'value added' to the expansion of the standard and all the definitions etc? It would seem that there are still a lot of lessons to be learned towards the interpretation of the 1994 Standard.

Additionally, I have wondered what are the Geometric tests that one must pass to qualify to serve on the committee.
 
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