Designing for easy manufacture was one of Henry Ford's main contributions to building cars, rather than any specific design features or manufacturing techniques such as the assembly line. Assembly lines and mass production were not new - they date from, I think it was Venice's naval shipbuilding in the fifteenth century.
Mass production machinery and interchangeable parts was introduced to block making at the Royal Dockyards by the elder Brunel in about 1800, and by the middle of the century was being used by Colt for the production of firearms. What Henry did was to take these production methods and design for them. And this has been accelerating ever since.
It does not have to bee in conflict with maintainability though. A good example is the Martin-Baker MB3 (Sabre engined) and MB5 (Griffon) which offered superior performance and manufacturing ease and maintainability compared to that of the existing Hurricanes and Spitfires, or indeed their immediate evolved descendants (Typhoon and Spiteful). It was not put into production, probably because the existing aircraft types were already being mass produced.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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