07-26-2017
08:28 AM
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07-26-2017
08:28 AM
CAD drawings are not always constructed to scale and when created with great precision the value is the nominal size and does not reflect the allowed tolerance. There are rules for tolerancing in drawings of manufactures parts. The tolerance may be specified explicitly in a dimension line or implicitly via the precision of the dimension line value.
Buildings are a different story. I would not expect to ever measure distances on a drawing and use them to build something with any precision.
You might find this discussion interesting: http://archinect.com/forum/thread/86328/drawing-precision
lee.minardi