A depth micrometer is used to measure the depth of small holes and bores. It has five key parts, including the spindle, sleeve, and thimble. Accurate readings require patience and precision. Digital options provide even better measurements.
A depth micrometer is a sensitive instrument that is used to measure the depth of small holes and bores. Used by engineers and mechanics, this device has a number of unique pieces that help it dial in an exact fit. Reading depth micrometers is a precise science that must be done carefully. For those lacking the time or patience, technology has provided micrometer enthusiasts with a digital option for even better readings.
Knowing the precise measurement of a hole opening is important business for engineers and mechanics. It can be the difference between a perfectly running engine and a disaster. The key to using your depth micrometer correctly is patience, because the readings are highly sensitive and rushing to take a measurement will not yield accurate results.
A depth micrometer is made up of five key parts that make up this stubby, screwdriver-looking device. The spindle is the most important part of the depth micrometer calibration process because it is the thin probe at the end of the device that takes the actual measurement. Further up that rod, the basis of the gauge is the spacer and spindle lock screw that are used for tightening and loosening. Actual measurements are taken on the thickest part of the micrometer, the rounded handle-like parts called the sleeve and thimble. These parts are labeled with numbers representing measurements that can be adjusted to get accurate readings of a hole.
To get that precise reading, the micrometer spindle must be inserted gently into an opening that needs to be read. By slowly turning the sleeve, the mandrel will descend further into the hole. Turning this dial until the spindle touches the end of the aperture will give an accurate measurement. This measurement can be read by removing the micrometer from the opening and looking at where the numbers line up along the sleeve and thimble.
With anything measured by hand, there is always a risk of user error and it is possible not to get a perfect reading with a traditional depth micrometer. Measurement became more accurate with the invention of the digital depth micrometer. This machine resembles previous hand-controlled models, except it has a small digital screen near the end. By simply inserting the stylet into a hole, the exact depth measurement is displayed on the screen for a more accurate reading.
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