The sleeve zero line should line up with the zero on the thimble scale. The calibration process for this particular style of mic is quite simple.Īll you have to do is roll the 0-1”rod all the way up into the base of the tool, place the base on a flat surface and turn the thimble ratchet clockwise until the measurement rod tip is stopped by the flat surface and the ratchet click” three times. Once that is complete, simply, read the depth measurement.Īlthough depth micrometers tend to stay calibrated, it’s always a good idea to check your instrument before using it. Holding the base firmly on the reference surface, rotate the thimble ratchet clockwise until the rod stops on the measurement surface and the mic clicks three times. Then, turn the thimble counterclockwise so that when the base is flat on the top surface, the measurement rod does not touch the surface to be measured. Insert and rotate the measurement rod into the rod-receiving shaft to seat it completely. Next, clean the mounting surfaces of the measurement rod and the rod-receiving shaft. They are extremely easy to read and can measure in both inches and millimeters but are also more delicate than their analog counterparts.įirst, you’ll want to select the right rod size (which depends on the depth of the recessed area you are trying to measure). If properly maintained and calibrated, they can last forever but, as for any other type of micrometers, they require a bit of thinking when it comes to reading the measurement.ĭigital depth micrometers, on the other hand, apply electronic principles to take measurements. Mechanical depth micrometers apply the working principle of the screw and nut to display the reading on the sleeve. The measurement is read in reverse and increases as the thimble moves toward the base of the instrument.ĭepth micrometers come both in digital and mechanical styles. Unlike traditional mics, zero is located toward the end of the thimble. Just like any other mic, depth micrometers feature a scale on the sleeve that shows the depth measurement. Measurement rods come in different sizes and are interchangeable to allow the measurement of multiple depths. The measurement rod typically has a small diameter to facilitate the measurement of small holes or slots. The flat base stabilizes the mic on the top surface of the recessed part. The two main parts that differentiate depth mics from outside mics are the flat base attached to the sleeve and the measurement rod.
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