Introduction of working principle and usage of reading microscope
1. First, zero the reading microscope (be careful to turn the knob gently, because the reading microscope is a high-precision instrument with high cost, and too much force will reduce the accuracy);
2. Then place the indented component on a horizontal workbench;
3. Place the reading microscope on the component (when the microscope and the workpiece are placed together, don't shake your hands, because the combination of the microscope and the workpiece is not very tight, which will cause reading errors if you don't pay attention), and point the light hole at the bright place;
4. Rotate the nut to make the marking line move left and right along the X axis;
5. The marking line is tangent to both sides of the indentation respectively, and the distance traveled by the marking line at this time is the indentation diameter;
6. Rotate the workpiece by 90, and measure it again (however, because the indentation is usually irregular, it is necessary to rotate the workpiece by 90, and measure it again and take the average value), and take the average value of the two results to get the zui final diameter of the hole.
7. Write down the reading, and put the microscope back to the designated position after zeroing.
Working principle of reading microscope:
A length measuring tool that uses microscope optical system to amplify, subdivide and read the graduation of line ruler. It is often used as a reading part of a length meter, a length measuring machine and a tool microscope, or as a positioning part of a coordinate boring machine and a coordinate grinder, and can also be used to measure smaller dimensions, such as line spacing, indentation diameter, crack and pinhole diameter in hardness testing, etc. Its dividing values are 10 microns, 1 micron and 0.5 microns.
According to the principle of subdivision, reading microscopes are usually divided into three types: direct reading, line moving and image moving.
1. Direct reading microscope: The scales on the line scale are partially enlarged by the objective lens and imaged on the reticle. If the line spacing is 1 mm, the scale is enlarged to be equal to the distance of 100 scales on the reticle, and the scale value of 0.01 mm can be read through the eyepiece (magnification).
2. Marking mobile reading microscope: When measuring, rotate the micro-motion handwheel to align the double marks on the movable reticle with the line image of the line scale, read the percentile and thousandth from the reading drum or other reading mechanism, and read the decimals from the movable reticle. In order to avoid the abrasion of the precise thread (or other micro-motion mechanism) on the micro-motion handwheel, some microscopes make the double scribed lines on the movable reticle into double Archimedes spiral lines (C in the figure). The pitch of the double Archimedes spiral is equal to 1/10 of the line spacing of the line ruler multiplied by the magnification of the objective lens, and 100 equal divisions are engraved on its inner ring, so after it is aligned with the line image, the decimal digits can be read from the fixed reticle and from the movable reticle.
Read percentiles and thousandths on the reticle.
3. Image mobile reading microscope: A movable optical element (such as plane parallel glass, wedge glass or compensation lens) is added between the objective lens and the reticle. When this kind of optical element is moved, the line image of the line scale will move. After the line image is aligned with the double lines on the fixed reticle, the values of decimals, percentiles and thousandths can be read from the fixed reticle and the movable reticle respectively.
The component that magnifies the scale of the line scale through the objective lens and projects it on the screen, and uses the reticle and micro-motion device to subdivide and read it is called the optical reading head. It can reduce the fatigue of human eyes when aiming and reading, and its graduation values are 10 microns, 2 microns and 1 micron.
Working principle and usage of reading microscope The microscope is a precise optical instrument with a history of more than 300 years. Since the advent of the microscope, people have seen many tiny tissues that were invisible in the past. At present, there are not only optical microscopes that can magnify thousands of times, but also electron microscopes that magnify hundreds of thousands of times, which make us have a further understanding of things around us. We measure the indentation size of Brinell hardness test, and most of them are done by microscope. Therefore, the performance of microscope is the key to do a good job in measurement experiment.
