How to measure the inner diameter of a ring gauge with a universal tool microscope
How to measure the inner diameter of a ring gauge with a universal tool microscope: The contact method is used for measurement. Generally, a measuring head with a diameter of a few millimeters is used to make contact with the inner wall of the measured ring gauge. Due to the small diameter of the measuring head, it can ensure point contact between the measuring head and the measured ring gauge. When measuring, when the measuring head is in the diameter direction A and B of the measured ring gauge, take two readings a and b of the instrument, and the size of the measured ring gauge is: D=(b-a)+d, In the formula: D - inside the tested ring gauge; b. A - Two readings of the instrument; D - Diameter of the instrument probe. The sensitive lever must be used in conjunction with a 3x objective lens. Choosing another objective lens will result in the inability to see the three pairs of double line images. Before measurement, install a 3x objective lens on the main microscope of the universal tool microscope, and place the optical sensitive lever at the lower end of the 3x objective lens with a coupling ring. Push the optical sensitive lever up enough and fix it with a rotating knob. Fix the tested ring gauge in the middle position of the workbench without any movement to avoid measurement errors. Lower the boom, introduce the optical sensitive lever probe into the hole to be measured, and then adjust the longitudinal and transverse slide plates of the instrument so that the probe contacts the hole wall of the ring gauge to be measured and is located in the diameter direction of the hole. Its sign is to adjust the transverse slide plate so that the longitudinal indication reaches a turning point (maximum or minimum value occurs). Keeping the horizontal indication constant, micro move the vertical slider so that the three pairs of double engraved lines in the eyepiece are symmetrically wrapped around the solid line of the meter line, and read the vertical indication a1 times. Then rotate the force measuring steering ring, change the force measuring direction, move the slider, and on the other side of the measured ring gauge, make the measuring head contact the hole wall in the direction of the measured aperture, and adjust the measuring head to be in a vertical position. Read the vertical indication b1 times, and use the contact method to measure the aperture principle D=(b-a)+d. Calculate the measurement result, and engrave the diameter d of the optical sensitive lever measuring head on the side of the lever. For example, when measuring a ring gauge with a diameter of 20mm, if the diameter d of the optical sensitive lever measuring head is 310749mm, the reading value is 8116569mm, and the reading value is 9815862mm, then the inner diameter ruler D of the measured ring gauge is: D=(9815862-8116569)+310749=2010042(mm).
