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I guess my argument for this can also be why are you making this much more complicated than it needs to be. The two original jpgs I posted are separate views on the same drawing control true position. Why would you complicate it like this?

So everyone seems to agree these are illegal call outs as I first thought. They are the customer so I need to tread lightly and present my case in a logical manner and back it up with proof from several books I have including the ASME standard which only shows a no datum reference used in a...

I found an example in the ASME Y14.5-2009 standard Fig- 7-59 page 153. I am not sure this applies since this is not a coaxial feature. Can someone please chime in.http://files.engineering.com/getfile.aspx?folder=1a4cf3a9-bd3e-4920-9de6-03b7ff70c84e&file=Coaxial_Feature_without_datum_reference.pdf

Ok their definition is this. Checks the straightness of the full bushing ID cylinder position to itself at the math data nominal position.

I know. There is nothing to reference the MMC to correct? So this is illegal right?

I know that's what I said! They are trying to tell me its a tolerance of the location of the bushing center line so in effect the Datum can move within the true position tolerance zone. I've never seen any true position that is not referenced back to a datum. Can anyone send me a link or...

I am looking for something to back up what someone has told me. I had a drawing where a bushing centerline is defined as Datum A and it has a true position feature control frame with no reference to any other datum. Is this legal? I've uploaded a jpg of...

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.

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?

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...