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During coordination, the first thing we need to check is the correct alignment of the models with each other. More than once, I saw situations where designers checked models that had completely different coordinate systems or were moved a few meters from one another.

1. Typical model placement problems

Wrong model placement may cause one of two situations :

• Situation A: Lack of collisions, because the models don’t overlap each other (picture below)

• Situation B: Models overlap each other incorrectly thus many nonexistent collisions appear in the check (picture below)

  

  Example of incorrectly placed models. You see that the Mechanical model is clashing with the Architectural one.

We want to avoid such situations, and make sure that disciplinary models use the same coordinates and coordinate system (situation C). In a simple terms, we want them to align perfectly 🙂

• Situation C - 3 disciplinary models combined properly.

There are many ways to do this, and it all depends on the modeling software you use.