To read the metric micrometer, first read the number of whole millimeters on the bottom row of the sleeve of the micrometer (Figure 3). Micrometer: To read either a .001" or .0001" micrometer, you place the material to be measured between the anvil and spindle, and then turn the ratchet until the spindle closes down and stops moving. Therefore, it’s very recommended turning adequately the lock nut to lock the spindle and prevent it moves before taking the reading. In order to increase accuracy, the vernier principle also is applied to an outside micrometer. The lengths of extension rod and collar are added to the micrometer reading. In the photo, the micrometer has an accuracy of 0.02mm. It has a precision of 0.01 mm and if you ever aspire to make something with tight tolerance you will probably need to use it. Tip: If the half mm increment is showing on the primary scale, add 0.5mm to the total reading. When a pair of calipers just isn’t accurate enough (i.e. Micrometer Free Preview External/Outside Micrometer . This means 5.0 mm. The barrel gauge will be divided into increments depending on the step size of the linear gauge. But here I have a metric one. Steps: To obtain the first part of the measurement: Look at the image above, you will see a number 5 to the immediate left of the thimble. It is used to check the outside diameter of the circle by the means of the accuracy of 0.01 mm or up to 0.001 mm. The barrel gauge is abbreviates so that "28" equals 0.28 mm. How to Measure With Micrometer: A micrometer is an essential tool for taking precise measurements. Then you read the markings on the sleeve and thimble. Vernier type Micrometer gives the highest acceptable accuracy of 1 micron such gauge is vernier type micrometer. In the case of a .0001" micrometer you would Remember that even a slight slip of the thimble can disrupt the measurement. Read the linear gauge, which is in millimeters, and then read the barrel gauge. Therefore, the measurement in the image is 7.14 mm. There are a variety of micrometers in the market from simple ones like the Mitutoyo on above to ones with Micrometer Reading, Use, and Measurement. There are different kinds (inside, outside, depth, inch), just look it up on Wikipedia. If there is an additional line uncovered on the top row, this is equal to one-half a millimeter (Figure 3). The combined reading is 3.58mm. Combine the two readings. 7mm + 0.14mm = 7.14 mm. The above image shows a typical micrometer screw gauge and how to read it. Micrometers come in digital, dial, and vernier styles, much like calipers: Mitutoyo Digital Micrometer… For metric micrometers that use millimeters in half-step increments, the barrel gauge will have 50 increments. So 0.5 mm would need to be added to the measurement. The fixed scale reading is 3.0mm because the "0" on the Vernier scale is pointing between the "3" and the "4." This one measures to the nearest .01 mm. It says so right here (click the picture for a better view…. We will have a look at how to use a traditional analog m… This type of micrometer can be read by 0.001 mm … need to measure a tolerance that is less than 0.002″), most machinists will turn to a Micrometer Reading. The micrometer is then removed and reading is taken. The Vernier scale reading is 0.58mm, because that is where the Vernier scale aligns with fixed scale values. A micrometer is used to take very precise measurements. These are the whole millimeters. Vernier micrometer. Notice that there is an extra line below the datum line, this represents an additional 0.5 mm. Lastly, you can get rid of the object, read the micrometer, and note the measurement if needed. , depth, inch how to read a micrometer in mm, most machinists will turn to a is! 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