Not only in production but also in everyday life, we often need to know the size of small parts. There are many different purposes; however, the most popular is still measuring the diameter of the drill bit or the cross-section of the cord as well as determining the size of the groove inside the workpiece; it is most convenient to use a caliper. This is a relative tool that is easy to use, although working with it requires some skill.
The scale is straightforward to use, but can only measure objects with very low accuracy. If the conditions of the problem impose a higher requirement on the measurement results, it is best to use a particular type of measuring device, called a caliper. This device allows the determination of internal and external dimensions of objects, as well as the depth of small holes.
A traditional digital caliper consists of a long bar equipped with a fixed jaw. A-frame with moving parts and screws stops moving along the bar. There are cuts on the flat surface of the bar, reproducing a ratio with a ratio of one millimeter. The length of the standard scale, as a rule, is 150 mm, although more impressive models can be found. On the mobile part of the device, you can see the scale of auxiliary use, called Nonius.
How to use the calipers
An instrument is required to measure using a regular caliper. To do this, it is necessary to separate the caliper sponge to a sufficient distance, then compact the object to be measured, for example, a drill or a metal rod. Do not use excessive force to prevent tool damage.
Now you need to look at the first label (on the left), located near the bottom scale, to find out where it was established. For example, if the label is between 0 and 1, this means the object is less than a centimeter in size. The next step is to find out parts of the scale on which labels fit. If it is the opposite of division 7, then the size of the object to be measured is 7 mm.
Using calipers, you can also measure a tenth of a millimeter. If the bottom mark is set between the numbers 7 and 8, you need to see which one exactly matches the risk on the upper scale, forming a single line with it. Match the fifth mark? This indicates that half a millimeter needs to be added to the result.
The caliper’s inner diameter for measuring is not too difficult. For this purpose, the tool has two slightly pointed sponges on the top. They need to be inserted between the inner surfaces of the cavity or tube and then pushed to a stop. All other measuring actions will be the same as described above for external measurements.
Measure with a digital caliper
When performing carpentry or plumbing often requires measurement of different holes. A standard-gauge is not very suitable for this, because it is difficult to measure, for example, a groove. Besides, it gives an accuracy of up to 1 mm, and this is not always enough. For a more accurate measurement, digital calipers are used, which allows for internal and external dimensions with an accuracy of 0, 1 mm.
- Consider an electronic caliper. The most common of them includes a bar with sponges. The sponge is fixed. There is a millimeter ratio on the bar. Its length is 150 mm. The frame moves along the bar, with the jaw moving on it. On the movable jaw is an auxiliary scale with a length of 19 mm. It is divided into 10 equal parts; the distance between the parts is 1, 9 mm. This auxiliary scale is called a Nonius. Before measuring, check the accuracy of the caliper, align the sponge. The zero points of the primary and secondary scales must match, and the tenth stroke of the secondary scale should be combined with the nineteen strokes of the primary. A digital caliper allows you to measure the depth of a hole, for this purpose, a depth gauge on the back of the bar.
- Securing a part in a vice. If there is no vice, fix it in any other way so that it does not move. Otherwise, the measurement will be inaccurate.
- To measure the outside parameters, cover the part with movable and fixed function. Gently press the sponge onto the part so that it does not cause mechanical damage or break the caliper. Fix jaw with support screw.
- Look at how the first-rate division coincides with the first Nonius risk. This part shows the total number of millimeters of the part. See where the risk of both scales exactly fits next time. Counting parts on Nonius. This number will represent one-tenth of a millimeter, and it must be added to the number of the entire millimeter.
- The internal parameters are measured by a pair of other jaws, inserted into the cavity. Counting is the same.
Note: Digital caliper lips should stand straight, not deformed.
Keep reading by holding the caliper directly before your eyes.
Above, I have shown you some tips for using the best digital calipers. Hopefully, through this article, you will learn useful tips for using electronic calipers more easily.