Measurement knowledge of tool microscope
1, image method: image method is the use of the central Olympus microscope marking, the image method of targeting and positioning of the measurement method. Measurement, usually the first (metre line) scribing board on the line aimed at the edge of the image of the test piece, and read the value on the reading Olympus microscope, and then move the table to the same line aimed at the other side of the image of the test piece, and read again. The difference between the two readings is the measured value of the measured piece.
2, axis cut method: axis cut method is the use of the central microscope marking through the test piece axis line and the use of measuring knife on the engraved line for targeting and positioning of the measurement method. Measuring knife is the accessory of Wan Gongxian. There is a quarter line on its surface, the size of the engraved line to the edge of the 0.3 and 0.9 mm two kinds, measurement, the measuring knife on the measuring knife pad, the engraved surface through the axis of the measured parts, and make the edge of the measuring knife and the measured surface in close contact, with the corresponding metre line to aim at, and measure the distance between the engraved line of the two measuring knives, it is indirectly measured measured the measured value of the measured parts. In order to avoid calculations in the measurement, in the middle of the vertical metre line on both sides of the engraved with two groups of four symmetrically distributed parallel lines, each group of engraved lines on the centre of the engraved line of the distance of 0.9 and 2.7 mm, which is exactly the blade of the stylus to the distance between the engraved line of 0.3 and 0.9 mm of three times. When aiming with the 3x objective lens, the 0.9 and 2.7 mm scribe lines on the dividing plate are exactly pressed against the 0.3 and 0.9 mm scribe lines on the stylus, and the cutting edge on the stylus is then exactly aimed by the middle scribe line of the metre line. Mainly used for thread centre diameter measurement.
3, contact method: contact method is the use of the central microscope marking pairs and close to the measurement of the measuring part of the measuring point, line, surface of the 10,000 workers show accessories ----- optical hole detector probe connected to the double engraved line for targeting and positioning of the measurement method. Measurement of the optical hole detector probe close to the surface of the piece (inside and outside). When measuring the diameter of the hole, first of all, the probe and the test piece of the inner hole contact, to obtain the maximum length of the chord, so that the metre line in the middle of the line by the optical pore sounder double set of lines in the middle, and in the readout microscope read a number; and then change the direction of the measurement, so that the probe in the other side of the measurement of the piece in contact with the same so that the metre line demarcation board in the middle of the line is still being the optical pore sizer double set of lines in the middle of the line in the readout microscope to read another number. The difference between the two readings, plus the actual value of the probe diameter, that is, the inner size of the test piece, such as subtracting the actual value of the probe diameter, that is, the outer size of the test piece.
