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