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Frequently Asked Questions
It is completely normal for a micrometer to become un-calibrated. This is easily fixed by just recalibrating it. Often, you will be able to zero a micrometer by using a small pin spanner that adjusts the sleeve in order to realign its zero line with the zero line on the thimble. Once this adjustment has been made, you can double-check the accuracy of your micrometer by adjusting it such that the anvil and the spindle faces are touching, and seeing that the micrometer reads zero. Another way in which to test the accuracy of your micrometer is to measure a standardized item, like a gauge block or rod, for which you already know the exact measurement.
Accuracy has to do with comparing two measurements to each other. One of those measurements is the measurement you are taking with some sort of measuring tool. The second measurement is the true value of that which you are measuring. The amount of difference between these two numbers is the amount of accuracy, with smaller values being more accurate. The closer the measurement you take is to the true value of what you are measuring, the more accurate your measurement is. Accuracy is very important in precision measurement techniques because you want the numbers you are collecting to be close to the actual values you hope to get. Any deviation from accuracy in a measurement system will throw off the entire measurement process.
A bore gage is a type of transfer tool that allows for high accuracy in measuring holes. Bore gages come in a few different types including telescopic gages, small-hole gages, and beam gages. Telescopic bore gages measure the size of a bore through a process of finding the internal dimension of a bore to a separately located measuring tool. A small-hole bore gage is first placed inside of a bore and adjusted until it is the exact size of the bore around it and then measured. The beam bore gage is intended for larger, harder to measure diameters. Another type of bore gage is called a dial bore gage. These bore gages take a more direct measurement of the bore using 3 anvils symmetrically located around the gage. Bore gages are indispensible when you need to get a precise measurement of a hole, a cylinder or a pipe. The standard bore gage is made of a central shaft sitting on a base with a measuring sled. Typically there is an indicator of some sort located on the side of the shaft. Often used alongside a micrometer, the bore gage is a well-designed tool that will provide exact measurements for diameters.