How to use a micrometer to measure small parts

MIC & ndash; has a very high accuracy instrument for measuring the size of parts. It is used where it is necessary the scrupulous observance of the sizes in the manufacture of products. The accuracy of its measurement is one-thousandth of a millimeter (micrometer or micron), and the error is only from 2 to 50 microns. It is much more precisely, than the same caliper. To imagine such values more clearly, we should remember that the thickness of a human hair is about 40 microns, and the diameter of a red blood cell – 7 microns.

About how to use a micrometer, it became known in the nineteenth century, but rather – in 1848 It was then in France, was issued a patent for this measuring device inventor Jean-Louis Palmer, although the idea of using screws, the principle of which is based on the work of the micrometer, known since the XVI century. First, the screw used in the military (firing of guns), and then – in survey instruments. In our days, on how to use a micrometer, known perhaps only to a narrow circle of specialists (e.g., lathe, machining high-precision surface). But knowing how to perform measurements using this instrument, clearly does not hurt anyone, especially dealing with technology.

The Principle of operation of micrometer

The Main part of the micrometer is clamped. It is made stationary, and to it are attached all other parts of the device: the heel (serving as a fixed stop when performing measurements), the stem of the micrometer screw, the drum with ratchet and pawl. The stem on which the scale is located, is a fixedly connected with the clip hook. The scale is printed along the stem risks and perpendicular strokes. Lower risks of strokes inflicted at a distance of 1 mm, and the mark – 0.5 mm. nowadays you can find MIC e, where all values shown on the display. The advantage of this device is that it can always be reset with just one push of a button. To achieve greater accuracy it is better to do before to use a micrometer.

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Moving the emphasis of the device is a micrometer screw. For its clamping in the desired position, use the stopper. On the stem is put on a drum, which is a conical surface, separated by strokes at 50 equal parts and put on a stalk. One revolution of the micrometer screw, and hence of the drum moves along its axis by 0.5 mm. Thus, one rotation of the drum in one division equals 1/50 of 0.5 mm or 0.01 mm. In order to avoid deformations of the part to limit the pressure of the micrometer screw is used ratchet.

How to use a micrometer when taking measurements

1. The Detail, the size of which needs to be measured, is placed between the heel and a micrometer screw. Rotating drum, to set the spindle as close as possible to the part.
2. Gently push the spindle to its contact with the measured part. Tightening must be done, keeping only the cuts, located at the end of the rotating drum. When the measuring end will abut the part, a scrollable part of the drum in the course will make a sound (click). After the third click, the rotation must stop.
3. With the help of Vernier to perform the measurement details in mm, which is read on the horizontal indicator bar located on the scale of the stem.
4. Determine the overall dimensions of the measured part.
5. Release the workpiece by rotation of the drum in the opposite direction.

In conclusion, the article on how to use a micrometer, it should be noted that the use of this simple but reliable instrument is not too difficult, and the ability to determine the exact size of very small parts can sometimes be very useful even.