View source for Atomically precise bearings

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'''Types of atomically precise bearings:'''
* [[Atomically precise slide bearing]]s
* [[Atomically precise roller gearbearing]]s
* Some form of alternative means for [[Levitation]]

== Which type to pick ==

Which type to pick depends on:
* the requirements on friction 
* the amount of available space
* the needed load bearing capability

== Bearing interface volume ==

By far the least volume is taken up by [[atomically precise slide bearing]]s. <br>
Thus they seem to be a natural choice for in [[Molecular mills]] in [[assembly level 1]] of <br>
[[gem-gum factories]] and preceding systems like [[sorting rotors]]. <br>
Smallest machinery is proposed to be run slow speeds like e.g. 1mm/s to ~5mm/s. <br>
Thus (and because of the [[scaling law]] of [[higher throughput of smaller machinery]]) friction levels stay low.

== Bearing friction ==

See main pages: [[Friction in gem-gum technology]], [[Friction]]

== Dynamic friction ==

Slide bearings experience dynamic friction which
* grows and shrinks quadratically with rising and shrinking speed respectively
* 1/10th the speed means 100th the friction => friction can be very low for low speeds 
* 10x the speed means 100xthe friction  => friction can also can get quite significant for moderate to higher speeds

Especially for higher speeds [[Atomically precise roller gearbearings]] might have quite a bit lower friction.
For those having 
* much slower relative motion (goes in quadratically)
* quite a bit less contact area (goes in linearly) - reduces load bearing capacity though

== Static friction ==

Atomically precise can effectively reduce static friction to zero by having 
the thermal equipartitioning energy kT much above 
the remnant wavyness of the potential energy across turning angles . <br>

For details see main page about: [[Superlubricity]]

== Increased friction from high loads ==

...

== Related ==

* [[Superlubricity]]
* [[Infinitesimal bearings]]