like, it is not only about ball of the Pen, but also about many things, like how small springs are made, and etc.
In: 8
A ball bearing is produced in steps. First, the rough shape is formed by squishing into a mold. This makes an approximate ball shape. Then they are put between two plates, which are rotated against eachother as the balls run between them. This smooths out the surface of the balls and makes them spherical. Then, if better precision is needed, the balls are put through similar plates again but this time the plates are designed to grind the balls. Lastly the balls are heat treated to make them stronger.
Similar ideas come into play with other items. The real trick usually isn’t how to make things super precisely, but in avoiding the need to make things precisely. Making things with precision is easy but often expensive and time consuming. Instead, engineers try to work around imprecise parts.
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