This is just to let you know that new version of Y14.5 is available.
https://www.asme.org/products/codes-standards/y145-2018-dimensioning-and-tolerancing
This thread has been inspired by some comments (recent and past) that implied that the usefulness of the customized DRF concept is questionable at best.
So I would like to ask for opinions about the attached example. Do you think the customized DRF for the pulley (primary conical datum feature...
Hi,
Throughout the years I have come to a conclusion that in general there are not many examples where changing dimensioning and tolerancing scheme from one to another would keep the geometric requirements for the system unchanged.
One example where this conclusion would not be true is...
Hello,
Below is a snapshot taken from the most recent Tec-Ease tip available on their website. My question would be following: Does anyone think that the true profile between points S and T (clockwise) has not been fully defined? I am specifically thinking about close vicinity of points S and...
"I hate MBD". This statement was made in another discussion about UOS all over profile application. As I have been pretty deeply involved in MBD for some time (drawing creation, proper CMM consumption of PMI characteristics, etc.), and personally see huge advantages of this methodology over...
I believe this is quite interesting tolerance stack.
Question is - what is maximum and minimum distance X as shown in attached picture?
http://files.engineering.com/getfile.aspx?folder=63724088-1f5f-4368-98e5-009be626f065&file=stack.PNG
Any feedback will be appreciated.
If you don't mind, I would like to hear some answers to the question from the attachment.
Please try to imagine really the worst-case than can ever happen for this type of part.
Drawing is in accordance with ASME Y14.5-2009...
I guess my general question is short: "How would you specify continuous feature of size on a print governed by Y14.5M-1994?"
Let's say I want to control total runout of an external cylinder containing an interruption (O-ring groove for instance) relative to a datum axis. How would you indicate...
Imagine that fig. 2-7 from Y14.5-2009 shows a pin instead of the rectangular block, and the flatness callout has been replaced by straightness FCF. Everything else stays the same (of course the diameter symbol is added to 10.7-10.8 dimension).
Knowing this, what is the minimum possible diameter...
I think we all agree that 2009 edition of Y14.5 introduced a lot of good stuff to GD&T language.
However, if you were to name some of its shortcomings, what would it be and why? Would there be any at all?
Please feel free to share your ideas, remarks, opinions. All are really welcomed.
There is one thing in well-known Tec-Ease's tip (http://www.tec-ease.com/gdt-tips-view.php?q=126) that wonders me. And it is not the 0.2 flatness callout for datum feature A which seems redundant, nor the position symbol used instead of perpendicularity for datum feature B in upper picture. It...
Short question:
Take fig. 8-17 from Y14.5-2009. Delete profile FCF and add length of the cone (let's say 50+/-0.2).
Would that be enough to treat the cone as fully defined?
These two terms show up in two different definitions throughout Y14.5. Center Point is used in Derived Median Line definition (1.3.31), while Median Point is something that Concentricity deals with (7.6.4). How would you describe a difference between them? Is there any? Thanks a lot for any input.
This may be a stupid question, but I will try:
Let's say a part similar to the one shown in fig. 4-26 of Y14.5-2009 has to be inspected and there is a physical datum feature A & B simulator available in order to define proper DRF and to mount the part on it during a check of positional callout...
Circularity as stated in paragraph 5.4.3(a) of Y14.5-2009 is:
"[...] a condition of a surface where for a feature other than sphere, all points of the surface intersected by any plane perpendicular to an axis or spine (curved line) are equidistant from that axis or spine."
Take a simple...
Guys,
Short question: Fig. 4-18 in Y14.5-2009. How would datum feature simulator C look like if there was no reference to A in positional FCF for 8.2 - 8.4 slot? Any difference to what 4-18 is currently showing? Thanks a lot.
Hello,
This time a little bit less specific question:
I am looking for some good real life examples showing differences between function and process driven GD&T, and somehow proving that function-based dimensioning and tolerancing is indeed beneficial in comparison to the latter approach.
Did...
The question is simple:
What is the difference between two cases shown on attached picture in terms of process of establishing datum axis for total runout measurement? Is there any or not really...
It is allowed to have datum callouts specified at MMB even if datum targets are used to establish a datum. If you are trying to establish datum axis based on e.g. 2 sets of 3 datum target points you can defined them on RMB (RFS) basis or MMB (MMC) basis.
Y14.5M-1994 did not specifically offer...
What do you think about discussing more in details about differences between ISO and ASME GD&T? What are the most important discrepancies between the two in your opinion?
