The caliper is a special measuring tool for both linear external measurements of small parts and holes in them. With the help of a caliper it is very easy to measure the diameter of round products.
Structurally, the caliper is a metal ruler on which there is a measuring scale, with stops at one end (in order to measure the internal dimensions) - upper jaws and internal jaws - they are used to measure external dimensions. Also, on the basis of a caliper, there is a special slider with an emphasis and a pin - a depth gauge. The slider also has a scale called a vernier. An additional vernier scale is designed for measuring accuracy.
Caliper scheme
1 - rod; 2 - slider; 3 - vernier; 4 - upper jaws; 5 - lower jaws; 6 - depth gauge; 7 - locking screw; 8 - detail, workpiece
The Soviet, and now the Russian industry produces fairly good calipers with various measurement parameters. So on sale you can find calipers with a maximum measurement size of 100; 125; 150; 200; 300; 400; 500; 600; 800; 1000 and up to 2000 mm. Also, they may differ in measurement accuracy. Calipers can have an accuracy of: 0.1 mm; 0.02 mm and 0.05 mm. By the way, in modern stores there are now a lot of calipers made in China, which are cheaper than domestic tools, and in terms of quality they are quite suitable for home use.
Marking of domestic calipers
Calipers are precise measuring instruments and have special markings that a knowledgeable person can use to learn about their characteristics and design. The marking of this tool is an alphanumeric code. In this case, the letters indicate the name of the tool, and the numbers indicate the type of caliper and its design.
So currently on sale you can find calipers of the following markings:
1. ШЦ-1. This caliper has a depth gauge in its design, as well as external and internal sponges.
2. ShTs-2. This type of tool has a double-sided arrangement of jaws, as well as a micrometric feed frame.
3. ShTs-2. A feature of this caliper is that the jaws are only on one side.
All types of calipers are available in various lengths as well as measurement accuracy. You can also find special models of this tool. The scope of these models is very specific, primarily due to the harsh operating conditions in which a conventional tool will fail very quickly. Some modern models of calipers do not have a classic measuring device, but arrow and even LCD digital indicators. It is much easier to measure with their help, but at a cost they are much more expensive.
Well, if the question of price has arisen, then when choosing this tool in the store, first of all, be guided by why you need it. If you are a turner, take a tool with high measurement accuracy, and if you need it for domestic needs, the simplest one will do. The price of models, depending on the accuracy, varies very much, there is also a large variation in prices along the length of the tool. The longer, the more expensive.
Using a caliper, it is very easy and simple to measure the thickness of the material with high accuracy,
Other hand measuring tools
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