Brief Introduction to the Reading Method of a Micrometer
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To read a micrometer, first determine the whole millimeter and half-millimeter measurements from the fixed sleeve, then read the decimal part from the thimble where the longitudinal line of the fixed sleeve aligns. The sum of these two readings gives the dimension of the workpiece. Below is a detailed introduction to micrometers: 1. Brief Description: A micrometer, also known as a screw micrometer, screw gauge, or micrometer caliper, is a more precise tool for measuring length than a vernier caliper. It can measure lengths accurately up to 0.01mm, with a measurement range of several centimeters. 2. Classification: Micrometers can be categorized into mechanical micrometers, electronic micrometers, vernier reading outside micrometers, small-head outside micrometers, pointed outside micrometers, wall thickness micrometers, sheet thickness micrometers, and micrometers with replaceable anvils, among others.
As an experienced auto mechanic, I use a micrometer to measure parts every day. The method is simple: first clean the measuring heads, then clamp components like pistons or bearings, and slowly turn the ratchet knob until you hear a click, indicating the right pressure. Read the integer and half-millimeter marks on the main scale (e.g., 20mm), then check which line on the vernier scale aligns with the main scale. Multiply that number by 0.01 (e.g., the 3rd line is 0.03mm) and add it to the main scale reading for the total measurement (e.g., 20.03mm). This technique is crucial for measuring cylinder liners in auto repair—inaccurate readings can ruin engine assembly, so practice to minimize errors. Never take readings while parts are moving, and calibrate tools regularly for precision. Beginners often struggle with shaky hands, so having an assistant helps stabilize the tool.
