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The use of the vernier scale is shown on a vernier caliper which measures the internal and the external diameters of an object. The vernier scale is constructed so that it is spaced at a constant fraction of the fixed main scale. So for a vernier with a constant of 0.1, each mark on the vernier is spaced 9/10 of those on the main scale.
A vernier caliper does not easily lose its calibration, but a sharp impact or accidental damage to the measuring surface in the caliper jaw can be significant enough to displace zero. [29] Digital calipers have zero set buttons, for quick recalibration. Vernier, dial and digital calipers can be used with accessories that extend their usefulness.
Dimensional characteristics (size, shape, and feature location) are normally inspected using calibrated tools such as Coordinate Measuring Machines (CMMs), Vernier calipers, Go/no go gauges, etc. It may also be a requirement for material testing to be completed, checking the hardness, conductivity and other properties.
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They are used as a reference for the calibration of measuring equipment used in machine shops, such as micrometers, sine bars, calipers, and dial indicators (when used in an inspection role). Gauge blocks are the main means of length standardization used by industry.
To accurately detect the maximal distance between the two halves of the gauge head, move the head of the gauge around while making the measurement to ensure you get the maximal reading. Grasp the gauge near the head to aid in your maneuvering of the gauge while adjusting the micrometer so it just stops the gauge's motion at one spot only.
A possible heading for dial, digital, and vernier: "Slide calipers". That's the heading Starrett uses for that category , which also includes non-vernier direct reading calipers--like a vernier but with just one mark on the stationary part. Ideas for the other category title:
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