A lot of engineers only get to work on one small aspect of a system not seeing the whole picture e.g. one person designing the engine and one the engine compartment. They often have envelope dimensions but not the actual parts/models.
This sometimes explains why some things are a bear to work on anymore. Also since maintenance procedures often aren't written till after a product is designed/built they include things like "pull engine to access #8 spark plug"
I'm not condoning this, just stating facts/opinions.
As far as your fit example I call it CADD cancer, and hate it. Just because a computer program defaults to four decimal places .0001" does not mean it needs to be that exact. There is a fine art to understanding fit and finish....
If a saw cut will do why machine and grind to a tenthousanths of an inch.... why because the drawing said 4.3125. That's why to this day I use fractional dimensions where ever possible. It shows the machine shop that it's just not that critical. But I too have made some boneheaded 3/4" pin 1/2" hole mistakes... It happens, but I'll be the first to admit fault and let everybody have a good laugh.
I had an intern once say something that I'm still quoting.
He said "Boy it sure does get expensive when you put it in steel.
He hit the nail on the head... paper's cheap... it gets expensive when you put it in steel!
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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