The CAD model that emerges during product development is often a creature of opportunity rather than foresight. It was made quickly and is ill-suited to long-term product support. The names and locations of models evolve and clarity emerges during the product development. They change to address the gaps between as-modeled and as-desired at any state of that development process. For instance, the alignment of axle and bearing once commanded where a wandering pocket might be located, but a well-designed pocket might insist on a location, with the bearing more than pleased to follow.
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