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Re:Mechanical Computing Systems Using Only Links and Rotary ... by fernly on Saturday January 13, 2018 @01:41AM (#16138541)
They make the point that rotary joints are for conceptual illustration, and it could equally use hinge or flex joints. This would be relevant at the nano scale,

> In particular, a molecular version of this architecture could use stiff covalently-bonded nanotubes for the links and single bonds for the joints.

In that case joint friction would not be a consideration, or at least I would imagine things like electrostatic or molecular bonding forces would be larger.

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