Most complicated part of the drawing There is more to it than just the numerical values

Which is better?

Holes Engineering Drawing

A Dimensioning Example, showing that placement should match intent

These drawings show bolts holes for mounting a flange onto a plate. When mounting the flange, the position of the holes with respect to each other is very important, or else the flange (or part) won't fit. It makes sense to dimension the distance between the holes, instead of the distances to the edge.

Fits Engineering Drawing

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