drawoh,
I totally agree!!! Y14.5 doesnt't allow it! I have some mfg folks trying to tell me that this "plane" is what they need. Was wondering what the crowd thought/
Y14.5m-1994 para 4.3.2:
Datum Feature Identification. Datum features are identified on the drawing by means of a datum feature...
Actually yes, these are good points. The scenario I was referring to is as below. Where the axes of the 5 holes are in a plane. The top and bottom surfaces are irrelevant. The holes may or may not be of the same diameter and will contain MANY other coaxial features.