How do calipers read, how do calipers read

1. Look at the total scale of the vernier ruler to determine the accuracy (the accuracy of 10 indexes, 20 indexes, and 50 indexes);

2. Read the integer first - look at the value of a carved line close to the ruler on the left side of the vernier zero line, and read the integer part of the measured size;

3. Read the decimal again - look at the right side of the zero line of the vernier, count the number of engraved lines of the vernier and align with the numerical engraved lines of the ruler body, and read out the decimal part of the measured size (that is, the reading value of the vernier multiplied by the order number of its aligned engraved lines);

4. Obtain the measured size - add the integer part and the decimal part of the above two readings to the measured size of the caliper (measured value = main ruler reading + vernier ruler reading).

Vernier caliper: According to the number of indexing grids on the cursor, vernier calipers are often divided into three types: 10 indexes, 20 indexes, and 50 indexes

Their accuracy (the minimum indexing value on the vernier - 0 1 mm, 0 05mm, 0 02mm, respectively), the textbook only introduces the reading principle of the 10 index vernier caliper, in fact, the 20 index, 50 index caliper is the same as its reading principle For example, the 50 indexes on the 50 index vernier ruler are only 49mm long, which is 1mm shorter than the 50 indexes on the main ruler, then each index on the vernier is 1 50mm shorter than each index on the master ruler = 0 02mn, That is, it has a measurement accuracy of 0 02 mm

Vernier calipers are read according to the following rules:

1) Based on the position of the zero engraved line of the vernier, read the whole millimeter number on the main ruler 2) See which engraved line on the cursor is aligned with a certain engraved line on the main ruler (regardless of the number of engraved lines), and read the decimal number below the millimeter from the vernier

3) The total reading is a millimeter integer plus millimeter decimal places.

Hope satisfied.

Here's how calipers are read:

1. When reading the caliper, first read the millimeter integer on the ruler based on the vernier zero scale mark, that is, the integer part in millimeters.

2. Then look at the alignment of the first few tick marks on the vernier with the tick marks of the ruler body, such as the 6th tick mark and the ruler body tick alignment, then the decimal part is millimeters (if there is no line that is exactly aligned, then take the line close to alignment for reading). If there is a zero error, the above result is subtracted from the zero error (the zero error is negative, which is equivalent to adding the same magnitude of zero error).

3. The reading result is equal to the integer part plus the decimal part and then minus the zero error.

4. Judge which tick line on the vernier is aligned with the ruler body scale line, and select the adjacent three lines, such as the line on the left side is around the corresponding line of the ruler body, and the line on the right side is on the left jujube sedan chair of the corresponding line of the ruler body, and the line in the middle can be considered to be aligned. If you need to average several measurements, you don't need to subtract the zero error each time, just subtract the zero error from the result.

The type and accuracy of the caliper

There are three main types of calipers: vernier calipers, calipers with tables and electronic digital calipers.

1. Vernier caliper.

A ruler-shaped, hand-held universal length measuring tool that uses the vernier principle to subdivide readings, mainly for measuring inner diameters, outer diameters, steps, depths, etc. When measuring, the integer part of the value is read from the master ruler and the decimal part is read from the vernier ruler. The vernier principle is to use the difference between the line spacing on the master ruler (referred to as line spacing) and the line spacing on the vernier ruler to read the decimal part.

There are and three minimum read values.

2. Calipers with tables.

A large-scale hand-held length measurement tool that uses the pitch of precision racks and pinions as a known length, and an indicator table with corresponding indexing as an amplification, subdivision, and indication part. Calipers with tables can solve the problem of reading errors of vernier calipers. There are two common minimum reads.

3. Electronic digital caliper.

It is a length measuring tool that uses measuring systems such as gratings and magnetic gratings to digitally display the measured values. The commonly used resolution is , and the allowable error is . There are also high-precision digital calipers with a resolution of , and the allowable error is .

There are also multi-purpose digital micrometer calipers with a resolution (this is the national patent of Anyi measuring tools, only they can produce), and the allowable error is . Because the readings are intuitive and clear, the stool is more efficient.

In addition, there are various non-standard calipers, such as hook depth calipers to measure groove depth, tooth thickness calipers to measure gear thickness, height calipers to measure object height, and weld calipers (weld gauges) to measure welding quality.

Calipers for special purposes: Sharp claw type, irregular unknown dimensional measurements. Offset type, measurement of position dimensions in unequal height areas. Depth type, depth measurement. Thin sheet type, narrow groove diameter measurement.

The caliper measurements correctly read as follows:

1. Look at the total scale of the vernier ruler to determine the accuracy (the accuracy of 10 indexes, 20 indexes, and 50 indexes);

2. Read the integer first: look at the left side of the zero line of the vernier and the number of a carved line close to the ruler to know the value, and read out the integer part of the measured size.

3. Read the decimal again - look at the right side of the zero line of the vernier, count the number of engraved lines of the vernier and align with the numerical engraved lines of the ruler body, and read out the decimal part of the measured size (that is, the reading value of the vernier multiplied by the order number of its aligned engraved lines);

4. Obtain the measured size - add the integer part and the decimal part of the above two readings to the measured size of the caliper (measured value = main ruler reading + vernier ruler reading).

Caliper reading considerations

1. Before reading, pay attention to the unit of measurement of the main ruler and vernier to avoid the situation that the unit of measurement is not uniform and miscalculated during the calculation. Blindfolded fingers.

2. Pay attention to the indexing of the ruler (that is, the accuracy of the caliper) before reading.

3. The accuracy of the caliper must be guaranteed by the reading result. For example, 10mm+20 is wrong, and the correct result is 10mm+20.

4. When reading, the line of sight should be perpendicular to the ruler surface, otherwise the measured value will not be accurate.

5. When measuring the inner diameter size, it should be gently swung in order to find out the maximum value.

Each compartment of the ruler is 1 millimeter, the dial is 2 millimeters in one circle, and each small compartment on the dial is millimeter, which now reads in millimeters.

a. Read the integer first - look at the value of the nearest engraved line on the left side of the vernier zero line, and read the integer part of the measured size;

b. Read the decimal again - look at the right side of the zero line of the vernier, count the number of engraved lines of the vernier and align with the numerical engraved line of the ruler body, and read out the decimal part of the measured size (that is, the reading value of the vernier multiplied by the order number of its alignment engraved lines);

c. Obtain the measured size - add the integer part and the decimal part of the above two readings to the measured size of the caliper.

Vernier caliper: according to the number of indexing grids on the vernier, the vernier caliper is often divided into 10 indexes, 20 indexes, and 50 indexes Their accuracy (the minimum indexing value on the vernier - 0 1 mm, 0 05mm, 0 02mm), the textbook only introduces the reading principle of the 10 index vernier caliper, in fact, the 20 index, 50 index calipers are the same as its reading principle For example, the 50 indexes on the 50 index vernier ruler are only 49mm long, which is 1mm shorter than the 50 indexes on the main ruler, then each index on the vernier is 1 50mm = 0 02mn shorter than each index on the main ruler, that is, its measurement accuracy is 0 02 mm Vernier caliper is read according to the following rules: (1) Based on the position of the vernier zero engraved line, read the whole millimeter on the main ruler (2) See which engraved line on the vernier is aligned with a certain engraved line on the main ruler (regardless of how many engraved lines), and read the decimal number below the millimeter from the vernier (3) The total reading is the integer of the millimeter plus the decimal number of millimeters.

The structure of the vernier caliper is a commonly used instrument for measuring length in the industry, which is composed of a ruler body and a vernier that can slide on the ruler body. If you look at it from the back, the cursor is a whole. There is a spring between the vernier and the ruler body, and the elastic force of the spring blade is used to make the vernier and the ruler body close.

There is a fastening screw on the upper part of the vernier to fix the vernier anywhere on the ruler body. The ruler body and the vernier have measuring jaws, the width of the groove and the inner diameter of the tube can be measured by the inner measuring jaw, and the thickness of the part and the outer diameter of the tube can be measured by the outer measuring jaw. The depth gauge is connected to the vernier ruler to measure the depth of the groove and the cylinder.

There are scales on both the ruler and the vernier ruler. Take the vernier caliper accurate to the millimeter as an example, the minimum division on the ruler body is 1 mm, and there are 10 small equal divisions on the vernier ruler, with a total length of 9 mm, and each division is millimeters, which is a millimeter difference from the minimum division on the main ruler. When the measuring claws are brought together, the ruler body and the zero scale mark of the vernier are aligned, and their first scale mark is separated by millimeters, and the second scale mark is separated by millimeters by ,......The 10th tick mark is 1 mm apart, i.e. the 10th tick mark of the vernier is exactly aligned with the 9 mm tick mark of the master ruler.

The reading method of calipers can be divided into three steps: 1. Read the whole millimeter according to the nearest scale on the main ruler on the left from the zero line of the secondary ruler; 2. Multiply the number of engraved lines aligned with the right and the main ruler by the number of decimal points according to the zero line of the sub-ruler; 3. Add up the above integers and decimals, that is, the total ruler is early.

When measuring, place the measured object between the measuring jaws, move the measuring jaws, clamp the objects, and tighten the fastening screws after the measurement is completed. When reading, the zero tick mark of the vernier is used as the standard, and the millimeter integer on the mega-speed ruler is read, and then the value indicated by the vernier is read. Observe the alignment of the first few tick marks on the vernier with the tick marks on the ruler, take the closest line to alignment, and add the two readings to the measured value.

Reading error of calipers.

If there is a zero error in the reading of the vernier caliper, the above result is subtracted from the zero error, and the reading result is: l = integer part + decimal part - zero error, and the following method can be used to determine which tick mark on the vernier is aligned with the ruler body tick mark

Select the three adjacent lines, such as the line on the left is on the right of the corresponding line of the ruler body, and the line on the right side is on the left of the corresponding line of the ruler body, the middle line can be regarded as aligning the L = scale before alignment + the nth scale mark on the vernier and the scale line of the ruler body aligned with the x index value, if you need to measure several times to take the average, you do not need to subtract the zero error every time, as long as the zero error is subtracted from the final result.

Here's how:

Tools Slag Noise: Vernier Caliper, Electronic Vernier Caliper.

1. The reading method of the vernier caliper is based on the reading on the main ruler + the reading on the vernier These two parts are composed, for example, as shown in the figure below is a schematic diagram of the scale of the main ruler and the vernier after measuring an object.

2. To read this vernier, you must first read out the scale on the main ruler, that is, the main ruler scale of the 0 line of the vernier is correct: 21mm, and the part that exceeds 21mm will be based on the reading of the vernier.

3. Then observe how many grids the cursor is in total, because this involves the length of each grid on the cursor, and the cursor of each kind of vernier caliper may have a different total number of grids. As you can see from the figure above, the cursor has a total of 50 cells, so the length represented by one cell is: 1 50=.

4. Then look at which scale black line in the 50 grids on the vernier and which scale black line on the main ruler exactly coincides and aligns, and then align the number of squares before the alignment black tick mark on this vernier The length represented by a small grid is the total reading of the vernier, as shown in the figure below: 21*.

5. Therefore, the total reading is the scale on the main ruler plus the scale on the vernier, that is, the calculation process is shown in the figure below.

Precautions: 1. Vernier calipers belong to precision measuring instruments, which should be handled with care and put back into the caliper box when not in use.

2. Whether the measuring tool is used reasonably or not not only affects the accuracy of the measuring tool itself, but also directly affects the measurement accuracy of the size of the parts, and even the quality accident occurs, causing unnecessary losses to the country.

Therefore, we must pay attention to the correct use of measuring tools and strive for excellence in measurement technology to obtain correct measurement results and ensure product quality.

Cursor. Part of the first look at the number of 0 pairs of the main ruler, which is millimeters, and see that the value on the vernier ruler is aligned with the reticle of the main ruler, and the aligned value is a few tenths of a millimeter.

The value of each scale on the dial is ", and the value of each full rotation of the dial hand is equal to the value of one scale above the main ruler, which is "1mm". When reading, read the value on the main ruler first, and then read the value on the dial beam. When the value on the main ruler is an even number, the value of the right half circle is read on the dial; When the value on the ruler is an odd number, we read the value on the left half circle on the dial.