Because it's the most efficient way to put things together if you're doing many identical items with a lot of human labor.
After the development of mass production assembly lines, the next step is automated assembly lines. These lines use robotics instead of human workers to build items.
ships
Wasted motion is eliminated
Wasted motion is eliminated
Wasted motion is eliminated
Wasted motion is eliminated
Assembly lines
Almost everything manufactured today is built on some type of assembly line. Most assembly lines use only machines and robots to build products, but there are some companies, who make higher-end quality products, that use human labor in the majority of the process.
Various parts are made on assembly lines but the engines are put in by hand.
technology
Assembly lines are one innovation that have increased efficiency in production.
technology