True position of... length?

I use that method as that is what is asked for. In my particular example, these are reported back to my main (car) alignment. As for beign out of rotation, that would be caught when this is used for an sub-alignment for other features. I wouldn't pass these features to the new datum structure utilizing this slot if it was out of location. In addition, I have a hard gage for this alignment, which was part of my launch verification (gage studies & cmm verification).

I use that method as that is what is asked for. In my particular example, these are reported back to my main (car) alignment. As for beign out of rotation, that would be caught when this is used for an sub-alignment for other features. I wouldn't pass these features to the new datum structure utilizing this slot if it was out of location. In addition, I have a hard gage for this alignment, which was part of my launch verification (gage studies & cmm verification).