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Reaching zero point (the Narrow Line) | by mqc69
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Reaching zero point (the Narrow Line)

[...]A micrometer includes an anvil and a spindle having a flat plate-like distal end. The anvil includes a small-diameter pin of a predetermined length formed on a distal end portion of a rod-like anvil body, and a detection portion of a tubular shape fitted on the anvil body to be slidably moved along the anvil body, a distal end of the detection portion being formed into a plate-like shape, a pin insertion hole being formed in a central portion of the distal end of the detection portion, and the pin being inserted in the pin insertion hole. The anvil further includes a dial gauge which is contacted at its distal end with the detection portion, and indicates a plus value and a minus value in accordance with the movement of the detection portion. The distal end of the anvil is abutted against the distal end of the spindle, and when a distal end of the pin of the anvil coincides with the distal end of the detection portion, the dial gauge is set to a zero point. An object to be measured is inserted between the anvil and the spindle, and when the distal end of the anvil is brought into abutting engagement with the object to be measured, it is detected from the amount of movement of the detection portion relative to the pin of the anvil body whether the object to be measured is an appropriate one.[...]

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Taken on July 27, 2009