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The process of aligning a dial bore gage to a required zero point is called setting. When taking the measurement of a bore, the zero point will serve as the reference point from which you are measuring a distance. No matter which method you choose to set a dial bore gage, the end goal is to match the zero point, also known as the nominal size, you are striving for to the readout value of zero. The outcome of a properly set dial bore gage is being able to easily read off the measurement of a bore as it compares to the nominal size on your gage. The resulting measurement equals the degree of variation in the diameter, away from the set zero point. In order to ensure accuracy and precision of every measurement you take, you will want to set your dial bore gage before each use.
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