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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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