# Advice 1: How to use a caliper

Not only in manufacturing but also in everyday life there is often a need to know the size of a small detail. To measure the diameter of the drill or wire size to determine the size of the inner recess in the workpiece, it's best to use a caliper. This tool is very easy to use, although it requires a bit of skill.

## The device of the caliper

Measuring ruler is extremely simple in use, but to measure its items can only be with a very low degree of accuracy. If the conditions of the problem impose higher requirements to the measurement results, it is best to use a special kind of measuring tool, which is called caliper.
This device gives the possibility to determine the internal and external dimensions of objects and also the depth of small holes.

Traditional Vernier caliper consists of an elongated rod, is provided with stationary jaws. The rod moves the frame having movable elements and the retaining screw. On a flat surface of the rod are cut-off, reproducing a scale with divisions of one millimeter. The length of the standard scale, as a rule, equal to 150 mm, although you can find more impressive models. On the movable part of the tool, you can see the auxiliary scale called a Vernier.

## How to use a caliper

To measurements with conventional calipers, you need to prepare the tool. This is to differentiate between the jaws of the caliper at a sufficient distance, and then tightly compress them measured object, for example, a drill bit or metal rod. Do not need to exert undue force so as not to damage the instrument.

Now we need to look at the first (left) label, available near the bottom of the scale to figure out which division it was established. For example, if the mark lies between zero and one, this means that the object has a size less than a centimeter. The next step is to figure out which of the divisions of the upper scale mark coincides. If it is opposite of division 7, the size of the object being measured is 7 mm.

With the help of Vernier caliper can be measured also, and a few tenths of a millimeter. If the bottom label was established between numbers 7 and 8, you need to see which of the labels exactly matches the line on the upper scale, making it a single line. Coincided the fifth label? This suggests that to the result you want to add a millimeter.
The number of additional labels on the lower scale can be set to 10 or 20, depending upon the accuracy class of the caliper.

Inner diameter caliper to measure is also not too difficult. For this purpose, the tool has two slightly pointed sponge at the top. They must be inserted between the inner surfaces of cavities or tubes, and then push until it stops. All other measurement steps will be the same as those described above for external measurements.

# Advice 2: How to measure caliper

When performing carpentry or plumbing work is required regularly to measure different holes. The usual line for this is not very suitable, since it is difficult to measure, for example, a recess. In addition, it provides an accuracy of 1 mm, and this is not always enough. For more accurate measurements used the Vernier caliper, which allows to determine the internal and external dimensions with an accuracy of 0.1 mm.
You will need
• Caliper
• The part you want to measure
• Vise
Instruction
1
Consider the caliper. The most common of them consists of a rod with the sponge. Sponge still. The rod has a millimetre scale. Its length is 150 mm. the rod moves the frame, movable on her lips. On movable jaws located auxiliary scale length of 19 mm. It is divided into 10 equal parts, the distance between divisions 1, 9 mm. This auxiliary scale called a Vernier. Before measurement, check the accuracy of the caliper, aligning the sponge. The zero mark of the main and additional scales must coincide with the tenth stroke for more scale be aligned with nineteenth-stroke main. Caliper allows you to measure the depth of the hole, on the opposite side of the rod is a depth gauge.
2
Clamp the workpiece in the vise. If a Vice, secure it in any other way, so she did not move, otherwise the measurement will be inaccurate.
3
To measure external parameters will cover the detail of the movable and stationary jaws. Lightly press the sponge to the details so as not to cause mechanical damage and don't break the caliper. Fix the sponge support screw.
4
Look how the divisions of the main scale coincide the risk of the first Vernier. This division indicates the number of whole millimeters on the details. Look at where the risks of both scales exactly coincide next time. Count the tick marks on the Vernier. This number will indicate tenths of a millimeter, it must be added to the number of whole millimeters.
5
The internal parameters are measured by another pair of jaws which are inserted inside the notch. The calculation is exactly the same.
Note
The jaws of the caliper needs to stand up straight, without distortions.

Take readings by holding the caliper in front of you.
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