![]() Close the jaws and check that the indicator points to "0" on the dial face. It can measure I.D, O.D, Step and depth.Ĭlean the measuring faces before and after measurement. This capability is sometimes referred to as quadri feature.A dial caliper is a handy and versatile measuring tool. Most dial calipers are able to take four different kinds of measurement: outside measurements, inside measurements, depth measurements and step measurements. Graduation is normally indicated on the face of the dial. The graduation of most dial calipers is 0.02mm for metric versions, and 0.001 inches for imperial dial calipers. The graduation of a dial caliper is the smallest distance it can measure the value of a minor increment on the dial scale. To measure larger objects, you will need a caliper with a larger measuring range. When selecting a caliper, bear in mind the approximate size of the object you are measuring. The measuring range of most dial calipers is 150mm (6 inches), although calipers with ranges of between 100mm (4 inches) and 300mm (12 inches) are also available. The measuring range of a caliper is the difference between the largest value and the smallest value that it can measure. The reading given on the dial indicator is combined with the value shown on the main beam scale.ĭial calipers use a rack and pinion mechanism system, which transfers the movement of the jaws of the caliper to the dial indicator. The central feature, the dial indicator, makes dial calipers much easier to use and read.
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