A this point I am only guessing that I would have to align to the points 'a', 'b', 'c' & 'd'. Usually in this situation I would have X,Y&Z data for these points if that was to be the case and it would be made obvious what they are for.
I will only show this of the part as it doesn't show anything really, but 'a' is a mid point between two opposing holes on the other side of the part and the rest seem to be constructed from this midpoint with reference dimensions. Has anyone seen this style of print before? is this a legitimate way of creating the datum system?
