This thread raises an issue that I have been pondering. That is, AutoCAD's ability to accurately calculate points. My understanding is that ACAD can accurately calculate to something like 14 significant digits.
If your civil origin is at some predetermined municipal point on the map, and the clients house sits on a 5000 acre site, and is say, 45,000 square feet. Said 'origin' may be rather far from the actual architects geometry. Maybe a few miles, for arguments sake. Now I come along to fabricate all the millwork in that house and I need accuracy to 0.1mm. (Our CNC machines can achieve this quite easily I believe.)
If we all follow the origin started by the civil drawings, am I likely to run into problems with my drawings because I am relatively far away from (0,0,0)?
My question is, isn't it good cad practice to not draw so far away from the origin? I'm not looking for an argument here, but an education.