You know you're an old CAD Drafter when you receive modification documents specified in 'thousand of inches scale' and you have to figure out a real drill bit size or dimensional cut per scale doesn't come close. I teach and instruct so when someone asks me for a 0.401" drill bit I have no clue...and I thought we were to go metric per ISO standards. I go back to the drill bit list, find the closest size, determine percentage of thread tapped and IF the hole is a little small, I tell the guy 'wiggle the bit a little.' Railroad is in SAE/ANSI English in sixteenths of an inch. Engineers who produce production plans in CAD/CAM in 'thousands of inches' resolution are NUTZ...take me hours to translate into practical measurements laborers can use.
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