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Home > Education >Digital Caliper Information

General knowledge for digital calipers

In the last 20 years , the digital caliper come into the market. It can be easier to use due to the latest designs.However, it is more expensive than the old ones. Another useful features of the digital calipers are that they can be easily switched between inch and metric units on the readout, tolerance indications, digital output to electronic data collection systems, zero setting anywhere along the caliper's range and retention of the zero setting even when the caliper is turned off. With no moving parts in the readout, the digital caliper is exceptionally durable, standing up to some of the toughest manufacturing environments.
It is very important that the digital calipers must be treated with care and respect. Don not use it for purposes for which it was never intended (such as prying things apart). Do remember to wipe it clean after using, and do not throw it on the workbench.
Always check the caliper often for wear, as well as burrs and scratches on the jaws and contacting surfaces. You can just pass a master disc along the jaws while inspecting for wear or taper. It is extremely vital that a caliper should be calibrated at least once a year—more often when use is heavy or there are multiple users of the same instrument.
Though the caliper is a versatile tool, it is not one of the most precise. Skill is required for positioning the tool and interpreting the measurement result. As the user develops his "feel" for the tool, his measurement results become more consistent. Moreover, it also requires skill to apply the tool properly to the dimension being measured. The jaws of the caliper must be square or perpendicular to the part. They are held firmly against the part, but not to the point of deflecting them. The part should be kept as close as possible to the frame of the measurement tool.
The rule of ten says that a measurement tool should have ten times more resolution than the tolerance of the dimension. Calipers typically read in 0.001-inch units. So if the tolerance is tighter than ±0.005 inch, a micrometer (or some other higher accuracy tool) is the way to go.