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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 height gage is a useful precision measurement tool used to measure the height of an object or up to a specific height on an object. Height gages come in a number of sizes, with some being up to 6 feet tall. These tools consist of a main body that stands perpendicular to a solid base. Along the body sits the slider, which moves up and down in order to best position the measuring scriber, as well as the measuring jaw and clamp. By placing the slider at the level you are planning to measure, you can read the scale along the beam to determine the height needed. Height gages come in both manual and digital designs, with an enormous amount of precision attained by the digital versions. Each height gage has a particular type of touch probe that will change depending on the measurement needs of the user. The Brown & Sharpe height gages come with numerous types of available probes. As with all precision measurement tools, it is crucial to properly maintain a height gage so as to avoid wear and damage.