These micrometers come with a calibration certificate traceable to NIST that states they've passed a test for accuracy. The pitch of the screw thread on the spindle is 40 threads per inch. Blade Micrometers can be used to measure the outside dimensions of grooves. It is important to check if the micrometer is English or metric before using it for measurements. The above image shows a typical micrometer screw gauge and how to read it. Depth micrometers have a base that aligns with the top of the recess that needs to be measured. Now it gets a little easier to read the mike. This allows measurements within 0.001 millimeters to be made on metric micrometers, or 0.0001 inches on inch-system micrometers. A micrometer generally provides greater precision than a caliper, but can measure a smaller range of lengths. There are some important parts of the dial meter that you have to know first. Have you ever needed to make an extremely precise measurement? (often known by the brand names Mul-T-Anvil and Uni-Mike). Once you have secured the right measurement, you still need to understand how to read outside micrometer scales and combine both figures to call it a perfect measurement. For these types of measurements, we turn to the micrometer. Each of the longer lines (the ones with the numbers above them) equals .1˝ (4 x .025”). Then find a line on the vernier that exactly coincides with a thimble line. The key parts that you need to know are the frame, lock, thimble barrel, and ratchet stop. Be sure to unlock the locking knob before attempting to rotate the thimble. Listen to the latest Brake & Front End podcast. Verify that the IUT is clean. By adding the vernier reading to the thousandths reading the actual reading in ten-thousandths of an inch is obtained. Exact measurements like this are necessary when even the smallest of space between objects can cause problems or difficulties. Anatomy of a Micrometer. Steps: To obtain the first part of the measurement: Look at the image above, you will see a number 5 to the immediate left of the thimble. ©2004 Linn-Benton Community College. An "outside micrometer" is one that measures the outside of something such as diameter, length or thickness. Groove Micrometer. Metric micrometers read differently. If you work in an industry that works with small parts or fittings, you more than likely have. Micrometers are designed with a wide variety of styles and sizes for normal or specialized applications. It is commonly used in mechanical engineering and machining applications. Add that to the .375˝ and you have a reading of .385˝. How to read an outside micrometer 1 of 4 9/9/2007 8:04 PM Watch for discounts in your Shopping Cart when purchasing magnifiers! That’s a close fit. This could be the size of a pipe, tool or object from the outside. You can recognize a vernier caliper by the extra lines located on the barrel. Since micrometers only have a limited measurement span, they frequently come in packages of varying sizes to accommodate your needs. You can use a micrometer to measure very small distances with extreme accuracy. need to measure a tolerance that is less than 0.002″), most machinists will turn to a Micrometer Reading. You continue to turn until the rod hits the bottom surface of the hole being measured. Reading a dial micrometer is easy. How to Read an Outside Micrometer Graduated in 0.001" Micrometer thimble showing 0.276 inch Inside micrometer . There are other types of micrometers, including depth micrometers and inside micrometers. You will quickly improve if you practice with a real micrometer. Start with the numbers, then add the tick marks. To measure the distance, you simply turn a screw until the area to be measured is fitted perfectly to the mouth of the micrometer. Step7: Turn on the ON/OFF button of the digital outside micrometer. The main scale is graduated on the barrel with two sets of division marks. There are 50 divisions of .01mm on the thimble of a metric micrometer. How to read an outside micrometer 1 of 4 9/9/2007 8:04 PM Watch for discounts in your Shopping Cart when purchasing magnifiers! It sounds confusing, but take your time and keep at it. your own Pins on Pinterest They come in many designs and styles to fit the needs of whatever object it is you need measured. If you need more precise measurements, which is quite common in machining, you can achieve readings in ten-thousandths of an inch by using a Vernier scale (optional on some micrometers). Recognize the Micrometer Body Parts. Combine the two readings. Reading is quite easy once you have secured the measurement you recorded with the lock nut because … Electronic Long-Reach Outside Micrometers with Calibration Certificate. Most micrometers are designed to measure within one one-thousandth of an inch! 2. When you are close use rachet to press the measuring face against the part. It is used to check the outside diameter of the circle by the means of the accuracy of 0.01 mm or up to 0.001 mm. You will quickly improve if you practice with a real micrometer. Use a vice grip to hold the frame of the micrometer and free up your hands. A micrometer is an essential tool for taking precise measurements. As the names imply, they measure depth and the inside diameters, respectively. The vernier micrometer as shown in Fig.consists of three scales as follows: vernier micrometer diagram. Therefore, when the zero lines of the vernier exactly coincide with thimble lines (Figure 2), the number on the vernier lines is the difference between the vernier line and the next thimble line in ten-thousandths of an inch. How to find the numbers you want will vary depending on the type and design of the micrometer. If it doesn’t read 0, … 1″-2″ outside micrometer This accuracy is achieved using a precision ground thread with 40 threads per inch on a rotating barrel. First determine the number of thousandths, as with an ordinary micrometer. There are several different designs, depending on what needs to be measured. One model of the inside micrometer resembles the outside micrometer in that it also has a thimble and ratchet for turning the spindle, and a sleeve with the measurements … *For example, 0.165 inches or 4.19 mm . With that in mind, here’s a quick quiz: What is the reading shown in Figure 1? When this happens you use the numbering system on the thimble to find your measurement. Parts of an Outside Micrometer. They look and move much like a C-clamp, which opens and closes by turning an internal screw. An "outside micrometer" is one that measures the outside of something such as diameter, length or thickness. Micrometer thimble showing 0.276 inch. 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