Three things to note when operating a tool microscope
1. Pay attention to the focusing sequence of the eyepiece and objective lens
Many people use the objective lens to adjust the focus when they start to measure. After adjusting the object's focal length, they then use the "meter" line in the eyepiece to align the measurement. If the "meter" line is not clear enough, they will adjust the focus of the eyepiece. . In fact, this order is wrong, because it will cause a certain artifact in the image of the object being measured after being focused. The correct method is to first adjust the "meter" line in the eyepiece clearly, and then focus on the object, so as to ensure that the "meter" line and the image of the object are clear.
2. Pay attention to burrs and scratches on the surface of the test piece before measurement.
The parts under test may produce some burrs and scratches during processing, use and transportation. These defects are not easy to detect, but they can easily cause misalignment of the universal tool microscope during measurement or cause the measurement surface to be not on the same focal plane. Certain local ghosts will affect the accuracy of the measurement results, so these surface burrs and scratches must be thoroughly removed.
3. Pay attention to the correct installation of the component under test
There are generally two types of installation methods for the parts under test on universal tool microscopes: (1) Placement of flat test parts. For flat test parts, it is important to note that the measured surface of the tested part should be on the same focal plane, otherwise it is easy to form a local ghost image. For parts with chamfers on the measured surface, it is best to keep the chamfer facing downwards, otherwise it will easily cause focus adjustment. Not clear, resulting in inaccurate measurements. (2) Installation of shaft measuring parts. Shaft test parts generally rely on the center hole for positioning. The hole must be cleaned before installation, especially to eliminate sand and burrs. Otherwise, the axis line of the test piece will be out of alignment with the center line of the instrument, resulting in Large measurement error. This situation is often encountered in daily measurements. The best way is to use the horizontal line of the "meter" line in the reticle of the instrument to check the runout error of the outer diameter of the measured shaft after installation, thereby judging the measured shaft. Are the components installed correctly?
