Shape and Plate

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I've since learned that antique clock parts are actually not flat or square, which makes reproducing them a lot easier. - Richard McCarty. [online].

Make a near-perfect geometric something, and then make it fit through a something-shaped hole in a plate with no light showing. The wavelength of blue light is about 0.000,017 inches (450 nanometers). This would be a hard project with a surface grinder. You have a file.

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Filing a Cube or Sphere

Filing a cube, and related projects. Single objects only (not "object-and-plate").

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Square End and Plate

Henry Royce (of Roll-Royce fame) is said to have done this as a part of his apprenticeship. It was also apparently done with both a square end and a triangular end.

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Hexagon-with-Keyways and Plate

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Cube and Plate

A square end has four rotational positions. A cube has three axes, each with four rotational positions. This project, which may be the apotheosis of the apprentices' project, is well attested from the British Royal Small Arms Factory.

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The epigraph to this page, by Richard McCarty, is from 2010-04-02 posting to a forum on the "Practical Machinist" website, at: http://www.practicalmachinist.com/vb/antique-machinery-history/filing-flat-201685/


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