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IndustryArena Forum > General Manufacturing Processes > Chucking and Measuring > How To Use Micrometer For Machined Parts-SANS Machining
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  1. #1
    Join Date
    Oct 2020

    Post How To Use Micrometer For Machined Parts-SANS Machining

    Accurate measurement is very important for CNC precision machining parts. Micrometer is a common measuring tool for machining parts. This article introduces the definition of the micrometer, learns the types and basic components of the micrometer, and more importantly, quickly obtains the readings and measurement methods of the micrometer.

    * What is a micrometer?

    Micrometers are also called micrometer thread gauges. This device can measure small diameters with a maximum diameter of 1.65 mm (plus or minus 0.005 mm). It is used in engineering to ensure that the measurement is accurate to the last millimeter. It is a precision measuring device with a calibration screw. It is mainly used to measure the small distance or thickness between the two faces of mechanical engineering and machined parts. Often used with other measuring instruments (such as dials), vernier calipers and digital calipers. The micrometer is also a useful tool for measuring the apparent diameter of celestial or microscopic objects in a telescope or microscope.

    * What are the Main Parts of a Micrometer

    Understand the structure and mechanism of the instrument to better understand and use the micrometer correctly. The main functions of the micrometer are as follows:

    Frame: C-shaped body that holds the anvil and barrel together. The frame is heavy and thick, which makes it difficult to deform under mechanical and thermal stress.

    Anvil: It is a part that rests on one side of the frame. In order to hold the object and make a measurement, the spindle moves toward the anvil.

    Sleeve/Barrel: A fixed cylindrical part whose frame is fixed on the other side of the anvil.

    Lock nut/thimble lock: This rod is used to tighten the movement of the spindle so that it will not move during measurement.

    Screw: It is the main part of the micrometer, hidden from sight.

    Spindle: The cylindrical component that moves when the thimble is rotated. This will touch the object to be measured and fix it.

    Thimble: It is a component that is rotated by the thumb and causes the spindle to move.

    Ratchet stop device: a device at the end of the instrument, which is only responsible for applying allowable pressure to the object, and cannot exceed this pressure.

    *How to Read a Micrometer

    1. Check the whether micrometer in English or metric, ensure the tool use the same unit as the measurement device
    2. Rotate your micrometer into a proper position and measure the object
    3. Read the largest number and count the number of quarters shown on the sleeve first, then read the number is aligned with the datum line on the thimble. Finally, add together these two numbers. The sleeve can be regarded as a ruler with ten numbers, and the space between each number is divided into quarters. One the sleeve, 1 corresponds to .100 inches, one quarter means .025 inches; while on the thimble, each line is equal to .001 inch, for example, 11 is read as 0.011 inches.

  2. #2
    Join Date
    Oct 2020

    Re: How To Use Micrometer For Machined Parts-SANS Machining

    * How to Use a Micrometer

    1. Hold the micrometer and support the entire device with the palm of your hand
    2. Grab the thimble between the thumb and index finger
    3. Wrap the little finger or ring finger partly inside the frame, do not block the object to be measured
    4. Hold the part to be measured with the other hand
    5. Gently clamp the object between the anvil and the spindle
    6. Twist the ratchet until the object is firmly fixed
    7. Read the micrometer

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