How to Measure the Inner Ring Dimension of a Ring Gauge with a Universal Tool Microscope
How to Measure the Inner Diameter of a Ring Gauge with a Universal Tool Microscope:Using the contact measurement method, a probe with a diameter of several millimeters is generally used to contact the inner wall of the ring gauge. Due to the small diameter of the probe, point contact between the probe and the ring gauge is ensured. During measurement, when the probe is at positions A and B along the diameter of the ring gauge, take two readings 'a' and 'b' from the instrument. The dimension of the ring gauge is then calculated as: D = (b - a) + d.Where:D = Inner diameter of the ring gaugeb, a = Two readings from the instrumentd = Diameter of the instrument probe
The sensitive lever must be used with a 3× objective lens; other objective lenses will not show the images of the three pairs of double engraved lines.
Measurement Procedure:
Before measurement, install the 3× objective lens on the main microscope of the universal tool microscope. Mount the optical sensitive lever on the lower end of the 3× objective lens using an adapter sleeve, push the optical sensitive lever fully upward, and secure it with the rotating knob.
Fix the ring gauge to be measured in the center of the worktable, ensuring no movement to avoid measurement errors.
Lower the arm frame and introduce the probe of the optical sensitive lever into the hole to be measured. Then, adjust the longitudinal and transverse slides of the instrument to bring the probe into contact with the hole wall of the ring gauge, positioning it along the diameter of the hole. This is indicated by adjusting the transverse slide until the longitudinal reading reaches a turning point (maximum or minimum value).
Keep the transverse reading unchanged, finely adjust the longitudinal slide so that the three pairs of double engraved lines in the eyepiece symmetrically enclose the solid line of the reticle, and record the first longitudinal reading 'a1'.
Then, rotate the force direction ring to change the force direction, move the slide, and on the opposite side of the ring gauge, bring the probe into contact with the hole wall along the diameter of the hole. Adjust the probe to a vertical position and record the second longitudinal reading 'b1'.
Calculate the measurement result using the contact measurement principle for aperture: D = (b - a) + d. The diameter 'd' of the optical sensitive lever probe is engraved on the side of the lever.
Example:Measuring a φ20mm ring gauge. Given the diameter 'd' of the optical sensitive lever probe is 3.10749mm, the first reading is 81.16569mm, and the second reading is 98.15862mm. The inner diameter D of the ring gauge is calculated as:D = (98.15862 - 81.16569) + 3.10749 = 20.10042 (mm)
