We stayed one night in Waterloo, Iowa so that we could go to the John Deere factory to watch how they manufacture large tractors. We went to the tractor cab assembly plant because we couldn't see the large harvesters as their plant was closed that week. It was a great tour. We rode on a tram pulled by a little John Deere tractor as we traveled around the assembly floor of this 48-acre plant to watch the tractors being assembled. It was amazing to watch how well coordinated the whole process was, even though there were many different things going on at the same time. Many parts of the process are completely automated to be done by "robots" with little human supervision. For instance, in the section where the green or yellow paint is applied it is done by an automatic sprayer tube that was able to twist and turn to reach all surfaces of the part being painted. And when it gets done, it knows to go back down and suck up all the excess paint so it won...
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