How to use and read a vernier caliper？
An ordinary vernier caliper has jaws you can place around an object, and on the other side jaws made to fit inside an object. These secondary jaws are for measuring the inside diameter of an object. Also, a stiff bar extends from the caliper as you open it that can be used to measure depth.
The basic steps are as follows:
1. Preparation to take the measurement, loosen the locking screw and move the slider to check if the vernier scale works properly. Before measuring, do make sure the caliper reads 0 when fully closed. If the reading is not 0, adjust the caliper’s jaws until you get a 0 reading. If you can’t adjust the caliper, you will have to remember to add to subtract the correct offset from your final reading. Clean the measuring surfaces of both vernier caliper and the object, then you can take the measurement.
2. Close the jaws lightly on the item which you want to measure. If you are measuring something round, be sure the axis of the part is perpendicular to the caliper. Namely, make sure you are measuring the full diameter. An ordinary caliper has jaws you can place around an object, and on the other side jaws made to fit inside an object. These secondary jaws are for measuring the inside diameter of an object. Also, a stiff bar extends from the caliper as you open it that can be used to measure depth.
3. How to read the measured value:
1), Read the centimeter mark on the fixed scale to the left of the 0-mark on the vernier scale. (10mm on the fixed caliper)
2). Find the millimeter mark on the fixed scale that is just to the left of the 0-mark on the vernier scale. (6mm on the fixed caliper)
How to use and read a vernier caliper？
An ordinary vernier caliper has jaws you can place around an object, and on the other side jaws made to fit inside an object. These secondary jaws are for measuring the inside diameter of an object. Also, a stiff bar extends from the caliper as you open it that can be used to measure depth.
The basic steps are as follows:
1. Preparation to take the measurement, loosen the locking screw and move the slider to check if the vernier scale works properly. Before measuring, do make sure the caliper reads 0 when fully closed. If the reading is not 0, adjust the caliper’s jaws until you get a 0 reading. If you can’t adjust the caliper, you will have to remember to add to subtract the correct offset from your final reading. Clean the measuring surfaces of both vernier caliper and the object, then you can take the measurement.
2. Close the jaws lightly on the item which you want to measure. If you are measuring something round, be sure the axis of the part is perpendicular to the caliper. Namely, make sure you are measuring the full diameter. An ordinary caliper has jaws you can place around an object, and on the other side jaws made to fit inside an object. These secondary jaws are for measuring the inside diameter of an object. Also, a stiff bar extends from the caliper as you open it that can be used to measure depth.
3. How to read the measured value:
1), Read the centimeter mark on the fixed scale to the left of the 0-mark on the vernier scale. (10mm on the fixed caliper)
2). Find the millimeter mark on the fixed scale that is just to the left of the 0-mark on the vernier scale. (6mm on the fixed caliper)
3). Look along the ten marks on the vernier scale and the millimeter marks on the adjacent fixed scale, until you find the two that most nearly line up. (0.25mm on the vernier scale)
4). To get the correct reading, simply add this found digit to your previous reading. (10mm + 6mm + 0.25mm= 16.25 mm)
4). To get the correct reading, simply add this found digit to your previous reading. (10mm + 6mm + 0.25mm= 16.25 mm)
4.Maintenance
Clean the surface of the vernier caliper with dry and clean cloth (or soaked with cleaning oil) and stock in a dry environment if it stands idle for a long time.
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Reading the Metric Micrometer
To read the metric micrometer, first read the number of whole millimeters on the bottom row of the sleeve of the micrometer (Figure 3). These are the whole millimeters. If there is an additional line uncovered on the top row, this is equal to one-half a millimeter (Figure 3). So 0.5 mm would need to be added to the measurement. Then add the thimble reading to whole and half millimeter sleeve readings. Refer to figures 3,4, and 5 and try to read the measurements before looking at the answer in the figure explanation.
 Figure 3 Metric micrometer reading equals 23.15 millimeters. |
23 whole divisions are uncovered = 23 millimeters.
0 millimeters divisions are uncovered = 0.0 millimeters 15 0.01 millimeter divisions line up on the thimble = 0.15 millimeters. |
Figure 4a Metric micrometer reading equals 18.60 millimeters.
Figure 4a Metric micrometer reading equals 18.60 millimeters.
The vernier metric micrometer has the ability to measure to two thousandths of a millimeter (0.002-mm). 0.002 mm is equivalent to approximately 0.00008 of an inch.
The vernier is graduated in increments of 0.002 mm starting and ending with 0 (Figure 5).
If either 0 on the vernier graduation scale lines up with the thimble reading, no additional thousandths of a millimeter are added to the reading.
Figure 5 The two-thousandths vernier scale line that lines up with the graduated line on the thimble is added to the reading. In this case 0.006 mm must be added.
 Figure 6 Metric micrometer reading equals 15.584 millimeters. |
15 - whole divisions are uncovered = 15 millimeters.
1 - 0.50 millimeters division is uncovered = 0.5 millimeters 8 – 0.01 millimeter divisions line up on the thimble = 0.08 millimeters. 4 – vernier divisions line up on the vernier scale = 0.004 |
