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Question on Datum Reference Frame
Link removed..
[IMG]http://www.engineersedge.com/engineering-forum/attachment.php?attachmentid=1852&stc=1[/IMG]
In the link above (assuming the drawing is correct), why is datum axis C not dimensioned off of datum axis B? Datum axis C is located off the edge, not hole to hole, why is that? Why bother having datum B in the FCF when defining datum C?
How are we defining that top hole? It is referencing Datum A, but I don't see how it is using Datum B or C, it is using the edge of the part again.
Thank you for any clarity.