It's true that of the potentially transformative technologies of the late 20th century, nanotech has been one of the slowest to materialize. But then, one could say the same of nuclear fusion, for which I still hold out high hopes.
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Mechanical devices have to be simultaneously precise as to both position and momentum.
That puts severe limits on how small they can be made and retain sufficient precision.
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So? We're not talking about electrons here, we're talking about things with many orders of magnitude more mass. There are actual calculations in Chapter 5 of Nanosystems. Which of them do you think is incorrect?
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It is not enough to say "quantum mechanics!", there are actual well understood equations that govern quantum systems, and you can do calculations using them, and the calculations say you're wrong. If you disagree, say which eq is wrong in Ch. 5 of Nanosystems.
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And again, positional uncertainty is tiny at room temperature; it only becomes interesting when you're operating at tiny fractions of a degree kelvin. At room temperature, only thermal motion is important, and it's still too small to cause trouble.
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BTW, I'll repeat: the relevant calculations are done in Nanosystems, page 90 on. It turns out the only important component is "classical" uncertainty; the quantum corrections vanish at any reasonable temperature, and the motion due to classical vibration is fine in stiff systems.
End of conversation
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