How to use a caliper?

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How to use a caliper?

The caliper is used to measure the distance (length), depth, and if necessary, the diameter of various parts and objects if they are small. Calipers come in several forms. They differ in that different calipers are able to measure objects of different sizes. Also, the difference is in how accurate the measurement is, they will comply.

Before using the caliper, you need to examine its structure. In the photo you can see the following parts:

Caliper structure

  1. 1. Barbell. This is the line itself, on which divisions of 1 millimeter in size each are applied. The length of the standard scale is 150 millimeters or 15 centimeters. It is this maximum size that a measured object can have. There are such types of calipers, the length of the rod in which exceeds the mark of 15 centimeters.
  2. Caliper frame (movable). With this frame you can move the sponge. The movable frame allows you to expand or narrow the sponge of the caliper to the size of the measured object.Thanks to the special screw (8), the movable frame can be fixed in the position that corresponds to the size of the object being measured.
  3. Scale with divisions. Thanks to this scale, you can find out and clarify the size of the measured object as an integer.
  4. "Sponges" for measurement (internal). With the help of sponges measured the size of the desired object inside. For example, glasses. Sponges are diluted to the walls of the glass, only inside.
  5. "Sponges" for measurement (external). Thanks to such sponges it is possible to measure an object outside. They need to close so that the left and right jaws tightly in contact with the walls of the measured object from the outside.
  6. Depth gauge - depth gauge. Such a device can measure the depth of a certain hole. Also, the depth gauge is needed to clarify the size of the various protrusions that can not be measured with a caliper.
  7. Auxiliary scale or nonius. This scale is located below the main one. The size of each division of the nonius is 1.9 millimeter. The scale itself has 10 such divisions. Accordingly, the length of the entire nonius is 19 millimeters. These dimensions are relevant only for the ShTs-1 series caliper, which is shown in the figure.With the help of such an auxiliary scale as a nonius, you can more accurately find out the size of the object being measured, taking into account up to a tenth of a millimeter.
  8. The screw that clamps the movable frame of the caliper. This part of the caliper helps to fix the moving frame, so that after measuring the desired item, it does not lose the available parameters.

A video on how to use a caliper on this page can help you a lot. You can also read the instructions on how to correctly check the accuracy of this subject.

In order to measure the desired item with a caliper, you need to take it (the object) with your left hand. It is better to hold the caliper in your right hand. Then you need to push the sponge (external) to the size of the object. They are divorced with nonius. Since this auxiliary ruler is movable, it will help push the jaws to the width of the measured object. Sponges should be in close contact with the extreme points of the measured object.

When the size is measured, it is necessary to fix the jaws with the fastening screw. When you do this, the item can be put off. Now look at the scale with markup.There you can see the length of the subject. To what number (by how many divisions) has the vernier shifted to the right side - an auxiliary ruler, so many tenths will fit the size of the item being measured. Now you know how to use a caliper, and accordingly, and use it in the necessary for this purpose.

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