The indicator nutromer is such a device that allows you to accurately determine the parameters and values of the internal holes of the parts, including their radius and depth. In this case, the device readings are displayed on the display using the contact method. In general, GOST indicator calipers are used in cases where there is a need to measure a part located in a very inaccessible place (that is, where it is impossible to use ordinary building tape). This element works on the principle of a radiusometer.
Characteristic
This measuring device is widely used as a kind of ruler for internal measurements of products. The indicator nutromer is produced in accordance with the standard measurement limits, which are determined by GOST. Often, such devices are able to determine the depth of the device in the range from 1 to 18 millimeters. Also, the caliper indicator has in its design removable washers and rods that are mounted in the hole of the tee of the tool head. The difference in their size is from 1 to 5 millimeters.
Device
The main structural element in the indicator caliper is the guide sleeve. A clock indicator is installed in its upper part, the reliability of which is determined by a special screw. It displays accurate measurement data. The scale on it can be either dial or electronic. Inside the sleeve, the caliper has a long shaft that is in contact with a similar part of a smaller diameter. The short rod rests against the “fungus” of the tee of the head. The tee has a removable measuring rod and an “engine”. Both parts are fixed in the housing with a nut. In addition, the indicator caliper has a centering bridge in its design. It is designed to install the indicator head. The diameter of the latter depends on the width of the hole of the part into which the device is inserted during the measurement of values. This is how the modern indicator caliper is arranged.
How to use this device?
Before performing work, you must reset the previous values. Resetting information is done in several ways - using a micrometer, a calibration ring, or an end measure. After the value “0” is displayed on the scale of the electronic or dial indicator, you can begin to measure the width of the part’s hole. In this case, the caliper is placed in the hole perpendicular to the product. By the value of the arrow, you can find out how exactly the reference values differ from those indicated by the manufacturer.
If the arrow of the device deviates to the right, then the diameter of the hole is less than the specified one. Accordingly, if the arrow is turned to the left, the width of the part is greater. In this case, the value and level of deviation of the width of the device from the reference are defined as the division price multiplied by the number of divisions by which the arrow itself has shifted.