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Figure 1. A 2,808-atom steric-contact sleeve bearing, based on concentric cylinders of strained diamond with modified (100) surfaces (oxygen and sulfur termination). Energy barriers to rotation are small compared to thermal vibrational energies. Designed by E. Drexler at Xerox PARC using Polygraf software and a computer-aided design tool under development by R. Merkle.
Figure 2. Same as Fig. 1, in an exploded view. Interlocking ridges on the shaft and sleeve give large strength and stiffness in resisting axial displacements at the sliding interface.
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