If an assembly line does exactly the same thing year after year, then there are many functions where it might make sense to design and build special purpose machines for various parts of the line … although note the observation about the difficulty of automating the insertion of the wiring harness. But, if the requirements keep changing, then the general purpose human form may be more readily adaptable … and, it can use existing machines without robitics design for use by humans. While many steps might be more ideally done with a specific designed machine, creating that machine is very expensive and time consuming, especially if the requirements keep changing … as it is likely to do for a wiring harness, for example.
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