Briefly describe the reading method of vernier caliper? Briefly describe the steps for reading an ou

Reading method of vernier caliper: When reading vernier caliper, first read the millimeter integer on the ruler body based on the vernier zero scale line, that is, the integer part in millimeters. Then see the alignment of the first few tick marks on the vernier with the tick marks of the ruler body, if the 6th tick mark is aligned with the ruler body tick marks, the decimal part is millimeters (if there is no line that is exactly aligned, then take the closest line to the 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), and the reading result is: l integer part decimal part zero error. Resources.

Steps for reading the outer diameter micrometer: 1) Reading the integer: The end face of the differential cylinder is the reference for reading the integer value.

When reading an integer, look at the value of the engraved line exposed on the fixed sleeve on the left side of the end face of the differential cylinder, which is an integer value. 2) Reading decimals: The baseline on the fixed sleeve is the benchmark for reading decimals.

When reading decimals, see which line on the cylinder coincides with the baseline. If the engraved lines on the fixed sleeve are not exposed, then the number of lines on the cylinder that coincide with the baseline is the number of decimal sought. If the engraved lines are exposed, then the number read from the differential cylinder is added to the decimal number.

When none of the engraved lines on the cylinder coincide with the baseline, the estimate should be carried out to the third decimal place. 3) Whole reading: Add the above two readings to get the entire reading value of the test piece.

Resources.

The main ruler reading of the vernier caliper is, and the first scale on the vernier ruler is aligned with a certain scale on the master ruler, so the vernier reads , so the final reading is:

So the answer is:

1. When the vernier caliper or reading is based on the vernier zero scale mark, the millimeter integer on the ruler is read. Then read the value of the trouser indicated by the vernier, observe the alignment of the first few tick marks on the vernier with the tick mark of the ruler, and take the closest line to the alignment to calculate.

2. The calculation method is: number of grids * accuracy. Finally, the two readings are added together to form the value of the silver damage measurement. Taking the tenth-degree vernier caliper as an example, the measured object is first placed between the measuring jaws and the measuring jaws are moved.

Vernier caliper reading method** is 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 value of an engraved 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 line of the ruler, 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 reading shed instructions precautions:

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.

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

3. The accuracy of the caliper must be guaranteed by the reading results. 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. When measuring the inner diameter size, it should be gently rocked to find the maximum value.

The use of micrometers.

1.When using a micrometer, it must be zeroed first, and the depth micrometer must be zeroed on a class 1 platform with an inner diameter of thousandths.

The ruler must be calibrated with a special calibration, and if it is a micrometer with a force measuring device, it must be reset to zero.

The force used must be the same as when it was measured.

2.When the depth micrometer is reset to zero, first retract the measuring rod to the base, and place the base of the micrometer on the platform, slowly.

Move the measuring rod down to the platform.

3.When the outer diameter micrometer is zeroed, slowly make the measuring rod contact with the measuring anvil, if it needs to be corrected, it should be corrected with %5

The force used is not to make the correction rod slip off, and the national code stipulates that the force is 2 3N

4.When measuring, in order to take into account the uncertainty of the measurement, it is generally necessary to zero more than twice, 5When using an outer diameter micrometer for outer diameter micrometer measurement, it is strictly forbidden to operate with one hand, and it is best to use thousands.

ruler base or auxiliary equipment.

6.Since the micrometer is an accurate measuring instrument, considering the repeatability factor of its measurement, it should be used more when measuring.

Several measurements.

7.The inner diameter micrometer is mostly measured by three-point contact, and attention should be paid to its upper and lower position and vertical situation when measuring.

8.After the measurement is completed, the micrometer should be returned to zero again to observe whether it can be returned to zero, and the zero error of its indication value is not.

It can be exceeded, otherwise it needs to be re-measured or calibrated.

Vernier caliper is a measuring tool that uses the vernier principle to read the distance separated by the relative movement of two measuring surfaces. Abbreviated as calipers or regular calipers. With four functions:

1.Outer Dimension Measurement 2Inner Dimension Measurement 3

Depth and height dimensions measure 4It is used to draw straight and parallel lines, and is sometimes called a four-purpose caliper. Vernier calipers are divided into three types, type, type, and type caliper.

Its structural components mainly include internal measuring claws, external measuring claws, depth measuring rods, fastening screws, main ruler frames and vernier ruler frames.

The calipers are as follows:

There is no structural difference between a type caliper and a type caliper, and the type caliper does not have a depth measuring rod. The situation is as follows:

In addition to the lack of a depth measuring rod, the caliper is similar to that of the type, and there is no internal measuring claw.

1. The reading of the ordinary outer diameter micrometer is relatively simple, and the differential sleeve is evenly engraved with a division of 50 around the week, and the pitch of the differential screw is generally, so its index value is. Millimeter scales are on a fixed sleeve, each scale. Thus, the whole number greater than (large number) is read on the fixed sleeve, and the reading less than (decimals) is read on the differential cylinder:

If the differential cylinder has been turned by 34 divisions, (less than that the reading is 34*

Second, the reading mechanism of the micrometer with the vernier and the vernier caliper is basically the same, the large number is read from the fixed sleeve of the micrometer and the main ruler of the caliper, and the decimal part depends on the alignment (alignment) of the index line (micrometer) or the main tick line (caliper) of the vernier indexing line. For calipers with an index value, if a tick line on the master ruler aligns with the 7th vernier tick line, the decimal reading is 7*. (Note that:.)

The vernier ruler of the caliper is generally scaled on its scale at intervals) At this time, if the reading on the main ruler (i.e., the large part) is 62mm, the measured value is 62+.

Common Measuring Tools Vernier Caliper Micrometer Dial Gauge Use animated courseware. Who can read out what the measured data is.

First, an introduction to vernier calipers

Vernier calipers are mainly composed of two parts:

The main ruler (generally in millimeters as the minimum unit length).

A cursor (or ruler, which attaches to the master ruler and slides).

2.Classification of vernier calipers: according to the number of grids on the cursor, the vernier calipers are divided into tenths, twenty degrees, fifty degrees, etc. (grids, which is the total number of the smallest unit length on the cursor).

3.The name of each part (the serial number of each part is marked in the subsequent figure):

1) External measuring claw (usually used to measure the length and outer diameter of an object).

2) Inner measuring jaw (usually used to measure the internal diameter of an object).

3) Depth rod (integrated with the vernier, usually used to measure the depth of trough-shaped and cylindrical objects).

4) Main ruler (on the same side as the outer measuring jaw).

5) Main ruler (on the same side as the inner measuring claw).

6) Vernier ruler (on the same side as the outer measuring claw).

7) Vernier ruler (on the same side as the inner measuring jaw).

Push the cursor, observe the position of the zero scale mark of the vernier on the master ruler, read the value on the master ruler before the zero scale mark of the vernier, and round off if it is less than one unit length (the reading of the main ruler in the figure is 24 mm);

Looking at the cursor again, there is the word "1 20", which means that the length between the two adjacent tick marks on the cursor is one-twentieth of a millimeter (mm). The reading method of the vernier is as follows: find out the scale where the scale of the vernier and the main ruler coincide, and the figure is "7", which means that the reading of the vernier is millimeters (if the scale marks of the vernier and the main ruler do not coincide, you need to remember the zero error);

Finally, add the readings on the main ruler and the vernier to the outer diameter of the nut: pay attention to whether there is zero error, if so, it needs to be counted).

Finally, some precautions when using vernier calipers are highlighted

1) In order to reduce the error, pay attention to whether the temperature is within the required range during the measurement process.

2) The storage and use should comply with the specifications to avoid damage to the vernier caliper, which will affect its life and cause measurement errors.

3) There should be no gap or too tight between the measuring claw and the measured object during measurement, otherwise the measured value will be too large or too small.

4) When reading, put the vernier caliper in a horizontal state, and the line of sight and the vernier caliper scale line should be as perpendicular as possible, otherwise it will cause the illusion of vision and produce errors.

5) In order to reduce the error, the value of different directions on the same section can be measured many times. For longer objects, it is possible to measure multiple times at different lengths.

Three types of vernier calipers.

indexing. indexing.

c 50 divisions.

Reading: Measured value = master ruler reading a + vernier ruler reading b

For the reading of the vernier caliper, please measure an object first, and the first point is to see the scale number of the 0 scale below the caliper aligned with the vernier at the 0 scale.

1. Common vernier calipers are: millimeters, millimeters and millimeters according to their accuracy. You should choose the right accuracy class according to your needs.

2. Measuring: Place the measured object between the measuring claws, move the measuring claws, and clamp the objects. After the measurement, the fastening screws should be tightened to prevent the value from changing during the movement of the gage.

3. Reading: When reading, the vernier zero scale line shall prevail, and the millimeter integer on the ruler shall be read. The vernier zero scale is located between 14mm and 15mm of the main ruler, so the integer millimeter is 14mm; Then read the value indicated by the cursor.

Observe the alignment of the first few scale lines on the vernier with the scale marks of the ruler body, take the closest line to alignment, and take the scale line at the 8 value of the vernier infiltration early and align with the scale line of the main ruler. Then the result of the buried reading is: 40 grids * accuracy) =; The sum of the two readings is the value of the measurement.

That is, the final reading is 14mm+