optical thread calipers

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Threading (manufacturing) — Threading is the process of creating a screw thread. More screw threads are produced each year than any other machine element.[1] There are many methods of generating threads, including subtractive methods (many kinds of thread cutting and… … Wikipedia
Micrometer — This article is about the measuring device. For the unit of length, see Micrometre. Outside, inside, and depth micrometers A micrometer ( … Wikipedia
Millwright — A millwright is a craftsman or tradesman engaged with the construction and maintenance of machinery. Early millwrights were specialist carpenters who erected machines used in agriculture, food processing and processing lumber and paper. In the… … Wikipedia

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