This is a post by Emma Rudeck on the Concurrent Engineering Site.
With a large assembly, there are a lot of interconnected parts, which makes it very complex to work with. Often, the model is so complex and it has so many parts that it’s hard for your CAD system to load it all up easily or quickly. This wastes time and means you can’t get on with your work. Also, with large assemblies, it is harder to ensure that all of the different parts work together. With more parts, there are more chances for things to go wrong.
HOW CAN YOU ACCESS A LARGE ASSEMBLY MORE EASILY?
Most of the time, you’ll only be working on one part of the entire assembly. This means there will be times that you can just open up this one part and now have to worry about the difficulties of opening the whole assembly.