Use of Total Runout question 1

[DHod84]

I am not the most verse in using GD&T, I plan on signing up for some more extensive classes on the subject. Last time I really used any was in school about 12 years ago, so I am a bit rusty at it. Anyways, I come from a background of handling equipment and radar system design so never really use GD&T on 99.9% of our projects.
I came across some drawings I need to review and something just didn't make sense to me. They are using Total Runout with Datum A being located on a axis and the Feature control frame on flat surfaces. To me it looks like they are not using the Total Runout correctly, attached is an example on how it was used in the drawing package. Does this make sense? See attached file.

any guidance would be appreciated. I may just be over analyzing this because of my lack of knowledge in using GD&T.

 

[3DDave]

ISO or ASME Y14.5?

If 'Y14.5-???? then it is wrong because no datum features are allowed to be defined by a centerline. Total Runout can be applied to a flat surface that is perpendicular to the axis of a specific datum feature.

 

[DHod84]

3DDave,
Yes, this is to Y14.5-2009. That's what I was thinking on the placement of Datum A. I just wasn't 100% sure. thanks for the input!

 

[Belanger]

Agreed. In theory datum A is indeed an axis, but ask yourself: Axis of what?
That's why the triangle symbol should be tagged to a physical "datum feature," not an untouchable center line.