M illing, grinding, polishing and fin- ishing: the manufacture of high- quality products such as space telescopes, orthopaedic joints and digital cameras in- volves a number of precision processes ei- ther applied directly to glass or metal, or indirectly to a mold. Whichever method is used, the key requirements are a com- pletely smooth surface and global form ac- curacy of only a few nanometers. In some cases the only option has been to fin

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