Size Must be Met.
The Y14.5 Standard has a
fundamental rule called Rule #1. You would think that this
rule would be thoroughly understood and followed by users of
drawings and the Standard. Unfortunately, I keep getting
questions about Rule #1 and its relevance. The most recent
question was whether or not Rule #1 applies to a width if one
side is designated as a datum feature. The answer is, "Of
course." Just because one side of the feature of size will be
used as a datum feature doesn't mean that the requirement of
size is no longer required.