What Is a Vernier Caliper?

Vernier caliper (VERNIER CALLIPER) is a measuring tool for measuring length, inside and outside diameter, and depth. The vernier caliper consists of a main ruler and a vernier slider which can be slid on the main ruler. The main ruler is generally in millimeters, and the cursor has 10, 20, or 50 divisions. Depending on the division, the vernier caliper can be divided into ten-degree vernier calipers, twenty-degree vernier calipers, and fifty-tenth-degree vernier calipers. The vernier is 9mm for 10 divisions, 19mm for 20 divisions, and 49mm for 50 divisions. There are two pairs of movable measuring jaws on the main ruler and the vernier of the vernier caliper, which are the inner measuring jaw and the outer measuring jaw.

Vernier caliper is a measuring tool for measuring length, inside and outside diameter, and depth. The vernier caliper consists of a main ruler and a vernier slider which can be slid on the main ruler. Viewed from the back, the cursor is a whole. The depth scale is connected with the vernier scale to measure the depth of the groove and the barrel.

When reading, first use the zero mark of the cursor to read the whole millimeter on the ruler, that is, the integer part in millimeters. Then look at the number of tick marks on the cursor that are aligned with the scale of the ruler. If the sixth tick mark is aligned with the scale of the ruler, the decimal part is 0.6 mm (if there is no line that is exactly aligned, the closest alignment is taken) Line for reading). If there is zero error, the above result will be used to subtract the zero error (zero error is negative, which is equivalent to adding zero error of the same size). The reading result is: L = integer part + decimal part-zero error to determine which one on the cursor The scale line is aligned with the scale line of the ruler body, and the following methods can be used: select the three adjacent lines, such as the left line is to the right of the ruler line, the right line is to the left of the ruler line, and the middle line A line can be considered to be aligned L = alignment before the scale + the nth scale line on the cursor is aligned with the scale line of the ruler * (multiplied by)

Common vernier calipers can be divided into three types according to their accuracy: 0.1 mm, 0.05 mm, and 0.02 mm. Vernier calipers with 0.05 mm and 0.02 mm accuracy. Their working principle and method of use are the same as the vernier calipers with an accuracy of 0.1 mm described in this article. The vernier caliper with a precision of 0.05 mm has 20 division marks on the vernier, with a total length of 19 mm. When measuring, such as the 11th root on the cursor

Vernier caliper storage method

After using the vernier calipers, wipe them with cotton yarn. When it is not used for a long time, it should be rubbed with butter or oil, the two claws are closed and the fastening screws are tightened, and the caliper box is covered. Vernier calipers are 0.1 mm (10 division marks on the vernier scale), 0.05 mm (20 division marks on the vernier scale), and 0.02 mm (50 division marks on the vernier scale), 0.01 mm (100 division marks are marked on the vernier scale) 4 kinds of minimum readings.

Vernier caliper matters needing attention

1. Vernier calipers are relatively precise measuring tools. Handle them gently and do not bump or drop them underground. Do not use it to measure rough objects during use, so as not to damage the measuring claws, and avoid putting them together with the cutting tool, otherwise the cutting tool may scratch the surface of the vernier caliper.

Multiple Vernier Calipers

Dry and neutral place, keep away from acid and alkali, and prevent rust. 2. The caliper should be cleaned before measurement, check whether the two measuring surfaces of the caliper and the measuring edge are straight and undamaged. When the two measuring jaws are closely fitted, there should be no obvious gap, and the zero position of the vernier and the main ruler should be The scribe lines should be aligned with each other. This process is called zeroing the vernier calipers. 3. When moving the ruler frame, move freely, there should not be too loose or too tight, and there should be no shaking. When fixing the ruler frame with fixing screws, the caliper reading should not be changed. When moving the ruler frame, do not forget to loosen the fixing screws, and do not loosen it too much to avoid it. 4. When measuring a part with a vernier caliper, do not apply excessive pressure. The pressure used should make the two measuring jaws just contact the surface of the part. If the measurement pressure is too large, not only will the measuring jaw bend or wear, but the measuring jaw will elastically deform under pressure, making the measured size inaccurate (the outer size is smaller than the actual size and the inner size is larger than the actual size). 5. When reading on the vernier caliper, hold the caliper horizontally and point it in the direction of bright light so that the line of sight of the person is as vertical as possible to the scored surface of the caliper, so as to avoid reading errors due to the distortion of the line of sight. 6. In order to obtain the correct measurement results, you can measure several times. That is, measurements are made in different directions on the same section of the part. For longer parts, measurements should be made at all parts of the full length in order to obtain a more accurate measurement.