Introduction to measurement knowledge of tool microscope
1. Imaging method: The imaging method is a measurement method that uses the marks of the central Olympus microscope to aim and position the imaging method. When measuring, you usually first aim at the edge of the image of the test piece using the scribed line on the (m-shaped) reticle, read the value on the reading Olympus microscope, and then move the workbench to aim at the same engraved line. On the other side of the image, take another reading. The difference between the two readings is the measured value of the device under test.
2. Axis cutting method: The axis cutting method is a measurement method that uses the mark of the central microscope to align the axis line passing through the test piece and the engraved line on the measuring knife for aiming and positioning. The measuring knife is an accessory of the universal display. There is a engraved line on its surface, and the dimensions from the engraved line to the cutting edge are 0.3 and 0.9 mm. When measuring, place the measuring knife on the measuring knife pad, and the engraved surface passes through the axis of the test piece and makes the edge of the measuring knife The mouth and the surface to be measured are in close contact, use the corresponding m-shaped line to aim, and measure the distance between the engraved lines of the two measuring knives to indirectly measure the measurement value of the component being tested. In order to avoid calculations during measurement, two sets of four symmetrically distributed parallel lines are engraved on both sides of the middle vertical meter line. The distance between each set of engraved lines and the central engraved line is 0.9 and 2.7 mm respectively, which is exactly the measuring tool. The distance between the cutting edge and the engraved line is 0.3 and 3 times 0.9 mm. In this way, when aiming with a 3x objective lens, the 0.9 and 2.7 mm engraved lines on the reticle just press the 0.3 and 0.9 mm engraved lines on the measuring tool. At this time, the cutting edge of the measuring tool is just in line with the middle marking of the P-shaped line. Aimed. Mainly used for thread pitch diameter measurement.
3. Contact method: The contact method uses the mark of the central microscope and the double engraved line connected with the measuring head of the optical hole measuring instrument, which is close to the measurement point, line and surface of the test piece. Aiming and positioning measurement methods. When measuring, place the probe of the optical boremeter close to the surface of the part (inner and outer). When measuring the aperture, first make the probe contact the inner hole of the test piece. After obtaining the maximum chord length, make the middle engraved line of the meter line be covered by the double set of lines of the optical boremeter, and read a number on the reading microscope. ; Then change the measurement direction so that the probe is in contact with the test piece on the other side. Also, the middle line of the meter-shaped reticle is still covered by the double sets of lines of the optical hole finder, and read on the reading microscope. Another number. The difference between the two readings, plus the actual value of the probe diameter, is the inner dimension of the test piece. If the actual value of the probe diameter is subtracted, it is the outer dimension of the test piece.
