How to Use a Micrometer?
3 Answers
Here is how to use a micrometer: 1. Clean the surface of the workpiece to be measured and place it between the two anvils of the micrometer. Ensure the micrometer's spindle axis is perpendicular or parallel to the workpiece's centerline. Measuring at an angle will directly affect the accuracy of the measurement. 2. Rotate the thimble to bring the anvil close to the workpiece's measurement surface. Then switch to rotating the ratchet until it makes a "click" sound. The indicated value at this point is the measured size of the workpiece. 3. After measurement is complete, lower the thimble and remove the micrometer. 4. After use, clean the micrometer thoroughly, keep it dry, apply a thin layer of industrial vaseline, and store it in its case. 5. Avoid heavy pressure or bending the micrometer, and ensure the two anvils do not come into contact to prevent affecting the micrometer's precision.
Using a micrometer, as a DIY beginner who just started learning last month, I felt quite confused at first. First, make sure everything is clean—both the micrometer’s surface and the small part to be measured must be free of dust or grease, otherwise the reading will be off. When holding the handle, don’t grip it too tightly; stay relaxed. Slowly rotate the thimble and gently touch the object being measured—avoid pressing hard to prevent damaging the precision components or the part’s surface. Once contact is made, immediately tighten the locking mechanism to hold the position. When reading the result, note the large number from the main scale (e.g., millimeters), then add the small scale reading from the thimble—for example, 10mm plus 0.35mm totals 10.35mm. I practiced by measuring screws to get a feel for it and now use it for checking bicycle chain thickness. After each use, remember to clean and reset it to zero, and calibrate it regularly to prevent error buildup. With time, you’ll become proficient.
In my work, I frequently use a micrometer to inspect the dimensions of mechanical parts. The procedure is straightforward: clean the tool and the part to be measured to avoid impurities affecting accuracy. Turn the fine adjustment knob slowly until it gently contacts the surface of the object, stopping when slight resistance is felt to avoid excessive pressure, which protects the sensitive tip. Then, lock the device in place. When reading the measurement, add the whole millimeter value from the sleeve to the fractional part from the knob—for example, 15mm on the sleeve plus 0.18mm on the thimble equals 15.18mm. Digital micrometers are even easier to use, displaying the measurement directly for convenience. I adhere to a monthly calibration routine to maintain an accuracy of 0.01mm. During measurements, I adjust the pressure based on the material's hardness—steady for steel, gentle for plastic. Maintenance is simple: just wipe with a soft cloth and apply a bit of anti-rust oil.
