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https://www.reddit.com/r/Damnthatsinteresting/comments/1jr550h/ball_point_pen_tip_under_microscope/mlcoon0/?context=3
r/Damnthatsinteresting • u/hat_and_curious • 1d ago
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It's amazing how smooth the surface of the ball is compared to even the metal ring that is holding it.
No wonder it once counted as a huge industrial achievement to be able to produce parts with such a precision (and cheap!)
12
u/kentaki_cat 1d ago
It's amazing how smooth the surface of the ball is compared to even the metal ring that is holding it.
No wonder it once counted as a huge industrial achievement to be able to produce parts with such a precision (and cheap!)