Profile of a Curve on a Centerline

[DetroitDesigner]

Hello and thanks in advance to everyone as I am new to this site. I am reviewing some of my company drawing GD&T and see some things that are shocking and some I'm just not sure if its right, wrong or possible. I have seen one that has a profile of a curve located on a centerline of a flat stock pieces of steel . . leaf springs to be exact. I am not quite sure what they are trying to show but to me it looks like they are trying to control. What do you think?

 

[DetroitDesigner]

Sorry I hit enter to quick. I was saying it looks like they are trying to control the centerline of each leaf to one another. There is a hole at each end of each leaf that a tip liner sits in. Appears that's what they are trying to control . . your thoughts?

 

[pmarc]

From standard point of view feature control frames should never be attached to imaginary entities - like centerlines, center points, center planes - thus the profile callout is defined incorrectly. Since profile of a line by definition controls linear elements of a surface, the leader should be associated with contour of the part, not with a centerline.

 

[DetroitDesigner]

Those were my thoughts but I had to ask someone else to get their opinion. I've seen overall width dimensions used to define a datum center plane but not like this where they are attaching a tolerance to an imaginary centerline.