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Isekai Nonbiri Nouka - Chapter 337: Technology
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... >But, no.
I can’t.
First of all, as the name implied, ball bearing needs balls.
You have to surround the axle with a number of balls. In addition, those balls have to bear the weight of the whole thing so it must be hard.
And all the balls should be of the same size too.
It is impossible to make them with the current iron-making technology.
I did not notice since the sample I made was a wooden ball bearing that I carved using the AFT.
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