TP and FCF basics

[kasabis]

looking in the asme y14.5 1994 pg 53 i see that all TP callouts must have a basic dimension locating these features. If this is true and i am inspecting the part from the example shown, would I have to include the height at which it was measured to have a 3D TP calculation (XYZ), or am I safe in assuming they are only interested in the 2D (XY)location of the hole, and include the -D- datum only as a restrictor to assure the DoF's are locked in in the same fashion prior to measurement?

I know this is remedial but would still like confirmation.
Thanks

 

[fsincox]

dingy2,
I also agree with you on not invoking a higher level of control if it is not needed, keep it simple, where ever possible.
For example, use an orientation tolerance if only orientation is required. I have long been a proponet of general profiles and feel that is not too hard to understand, people are resistant to change. The standard is clearly moving in that direction, I believe they are now shown in the current version.