What Is a Micrometer Screw?

OUTSIDE MICROMETER, also called a spiral micrometer, is often referred to as "micrometer". It is a more precise length measuring instrument than vernier calipers, with precisions of 0.01mm, 0.02mm, and 0.05mm. In addition to the estimated 1 digit, it can read the third digit (thousandth) after the decimal point. .

The structure of the outside micrometer is composed of a fixed ruler frame, anvil, micrometer screw, fixed sleeve, differential tube, force measurement device, locking device and so on. There is a horizontal line on the fixed sleeve, and there is a row of graduation lines with a distance of 1 mm on the line and the bottom. The graduated line on the differential tube is a horizontal line that divides the circumference into 50 equal parts, and it rotates. From the point of view of reading methods, there are three types of commonly used outside micrometers: ordinary type, band display and electronic digital display.

According to the principle of spiral motion, when the differential cylinder (also known as the movable graduated cylinder) rotates once, the micrometer screw moves forward or backward by a pitch of 0.5 mm. In this way, when the micrometer cylinder is rotated by one division, it has rotated 1 / 50th of a circle. At this time, the screw moves along the axis by 1/50 × 0.5mm = 0.01mm. Therefore, the micrometer can accurately read 0 .01 mm value.

use

Use the reference line of the differential sleeve as the reference to read the scale value of the left fixed sleeve, and then use the fixed sleeve reference line to read the scale aligned with the reference line on the differential sleeve scale line, which is the differential sleeve scale value. The sleeve scale value is added to the differential sleeve scale value to obtain the measured value.

Generally, the outside micrometer will be used in conjunction with a data acquisition instrument. The data acquisition instrument can be directly connected to the outside micrometer for automatic data collection. No manual recording of data by the operator is required, saving labor costs; Automatic data collection and data analysis.

Application background of micrometer

At present, the internal quality inspection method of the factory is to measure a piece of data and manually record it in the paper by the surveyor, or measure it by one person and record it by another person. When analysis is needed, the operator enters the EXCEL form; the problems caused by this method are low efficiency and easy to memorize the data. At the same time, some operators are not clear about the measurement specifications of the product. For products exceeding the specifications, the operator cannot take measures in time, and need to perform data During analysis, it needs to be entered into the computer repeatedly.

Main goal of outside micrometer

Realize paperless measurement, improve the accuracy of measurement and improve the efficiency of detection, and can promptly remind when the specifications are exceeded