Use a conversion factor of 25.40 mm/in to convert gauge block lengths to Metric from Imperial . Record measured values in the work sheet of inner measurements using a Vernier Caliper. In the example above, the 3rd tick mark on the sliding scale is in coincidence with the one above it, so the caliper reading is (21.30 ± 0.05) mm. Step 1 – Rest Sliding Jaw Opposing Upper Step Of Item Release the caliper gradually. For example if the least value is 0.01 mm and the 7th mark of the vernier scale is lined up perfectly then the vernier scale reading is 7 x 0.01 = 0.07. One of the measuring scales moves with the jaws. Students first learn about using vernier calipers in Sec 1. From the start to the end, the steps can be divided into some detailed ideas. … This will be the value of the zero error. Digital vernier calipers is an instrument intended to be used to measure things accurately from the LCD display. I have taught people to use vernier calipers, and I found the following two tips helpful to everyone I have shared them with: 1. In this article we will be taking an in depth look at the main features of a caliper and how to use one to take a reading. Vernier caliper can be used for three types of measurements, outside distance (such as the length of an object),2nd one is inside distance such as the width of a groove or the diameter of a large hole, 3rd one is depth, such as the depth of a hole or the height of a step. 2.Push the jaws firmly against the workpiece. When testing the Vernier Caliper, one of the points must be near the lower limit that the instrument can measure, another somewhere in the middle, and the third near the upper limit . What is Vernier Caliper & What is it Used for? Measurement of Object’s Steps With A Vernier Caliper: The combination of left side head of the Vernier caliper and the face of the upper jaw at right hand are normally employed to read step measurements. Use your thumb to slide the jaws open and closed. Release the jaws of the vernier caliper by scrolling thumb screw till the right upper jaw touches the lower step. Rotate the lock screw to make the jaws fixed and take away the item and measure reading of object. (It was often necessary.) This Wikipedia article on the vernier scale gives all the information possibly needed, but in short, it is a ruler with an added secondary scale which gives extra precision. Place the sliding jaw on the upper step of the workpiece, then open the caliper until the fixed jaw contacts the lower step. Lock the vernier scale into its position and take the reading as before. Preparing the Instrument: In order to ready your vernier caliper for measurement, first loosen the lock screw positioned on the upper side of the caliper by turning it counter clockwise. Open the caliper slightly. Place the depth gauge so  it touches with base of the hole or interior base of the space or cavity. However if the zero lines up before the main scale zero then you will need to note the position of another mark that aligns somewhere after the main scale zero. Rest the sliding jaw opposing upper step of the item being measured. There is a fixed main scale and a secondary, sliding scale attached to the jaws which is known as the vernier scale. You can use vernier calipers underwater, if necessary. Use the large jaws to measure objects from the outside; these jaws point to you as you read the caliper. For example if there are ten divisions per marking in the vernier scale then the smallest division will represent 0.1/10 = 0.01 mm. It’s not easy to understand how it’s read immediately, although learning how to read it is mechanical and quite obvious. Rotate the screws to fix the jaws in order to remove your item and take down the reading. Measurements are demonstrated step-by-step to the full range of the instrument. Rotate the screw to lock the jaws in order to take out your the object and reading the measurements. This is … This value should then be added to the final reading. The first thing to do before measuring anything is to first clean the object that needs to be measured and ensure that there is no dirt or anything that can touch the jaws and interfere with the reading. Start by making a reading on the major scale first by seeing where the number zero lands on the major scale . A Vernier caliper has two rulers: the main scale and the sliding Vernier scale. Here we have a reading of 24mm. Remove cutting chips, dust, burrs and other foreign substances from the piece to be measured. Release the internal jaws by rotating thumb screw till the outer of each jaw connects the boundaries of the gap. Read the Vernier scale which gives you the numbers to the right of the decimal point.Metric ExampleIn the picture below, the zero line on the Vernier scale is between 24 mm and 25 mm on the main scale. If the two 0 marks are lined up exactly, skip ahead to reading the measurement. Your email address will not be published. Taking Outside Measurements Using a Vernier Caliper: Vernier calipers are generally utilized to take measurements outside of an object for example small widths, lengths or diameters. A quick guide on how to read a vernier caliper.A vernier caliper outputs measurement readings in centimetres (cm) and it is precise up to 2 decimal places (E.g. How To Take Inner Measurements Using A Vernier Caliper: Inner measurements for example the diameter of a pipe is measured with the upper jaws of the vernier caliper. Vernier caliper least counts formula is calculated by dividing the smallest reading of the main scale with the total number of divisions of the vernier scale.LC of vernier caliper is the difference between one smallest reading of the main scale and one smallest reading of vernier … Set the sliding jaw slightly larger than measurable features. To measure the depth of the mortise, extend the probe of the vernier caliper and place its tip against the end wall of the mortise, as shown. Precious Joan Bragais 133,345 views. The next step is to take the vernier scale reading. Step 1 – Make Sure the Caliper Is At Zero. Step 1. Measurement of depth with the help of a Vernier caliper: Deepness can be measured by placing the depth gauge at the surface of container you want to measure. The Mitutoyo Institute of Metrology provides educational courses and on-demand resources across a wide variety of measurement related topics including basic inspection techniques, principles of dimensional metrology, calibration methods and GD&T. VERNIER CALIPER PRECAUTION: 1. Use the smaller jaws to measure holes and internal spaces, such as the inside of a pipe. The vernier reading can then be found by multiplying the least value of the vernier scale with the number of divisions till that mark. If you’re looking for a shorter version check out this article. Make sure that the zero lines of the vernier scale coincide with the zero lines of the main scale when the external jaws are closed. Don 't worry if it falls between 2 numbers - for example between 7 and 8 . Shut the jaws totally so that the caliper displays zero reading. Next note the distance travelled by the other mark. Read the scales on your Vernier caliper. Clean the caliper before use. Step 1 – Rest Sliding Jaw Opposing Upper Step Of Item. For example if the zero mark aligns with 1 mm on the main scale then you need to subtract 1 mm from the final reading. Internal measurement. Print out the template. Record the measured value in the worksheet of object’s step. For example if the other mark was previously on 0.4 and ended up at 1.2 then the zero error will be 1.2-0.4 = 0.8 mm. Your email address will not be published. Clean both the part and the caliper completely so that it is free from burrs and other obstacles. To do this find the mark on the vernier scale which lines up perfectly with a mark on the main scale. Loose clamping screws on both sliding jaws. b) The Vernier Scale Reading: A caliper has a main scale and sliding (Vernier) scale. If you need to measure an internal diameter, then insert the upper jaws in to the cavity and open them till they touch the sides. 3. Note down the measured value & record it in the work sheet you have made for measuring depth of the object. 3.Lock the clamp screw so that the jaws don't move 4.On the vernier scale is a small number 0. 4. Compare the 0 positions on the sliding scale and the fixed scale, which is engraved on the caliper body. Vernier Caliper – Working, Calculation Of Least Count & Zero Error, Vernier Caliper Least Count & Length Reading Formula, Vernier Caliper Functions & Important Parts, Frequently Asked Questions About Vernier Calipers, Ten Insize Vernier Caliper Both Digital & Analogue. While you increase the jaws with thumb screw, the depth gauge will touch the deep surface . Reading the metric scale of the vernier caliper is a two-step process. The main scale is marked in inches or centimetres and the vernier scale is usually graduated in divisions representing 1/10 of the smallest main scale division. The scales on a vernier caliper are marked and look similar to any ordinary ruler. Step 1 – Rotate Thumb Screw to Make Longer Depth Gauge. Learn how your comment data is processed. The step by step procedure for identifying the dimension of an object with the help of Vernier caliper is given below : Read the value of the main (stationary) bar scale which is just to the left and above the ‘0’ zero reading on the Vernier (moveable) scale. Determine that this is the best instrument you have available for the particular measurement. Place the object in between the two jaws such that they touch opposite ends of the object making sure the object is held firmly but don’t press too tight. Step 1: Measure the ambient temperature and record it. Move the sliding scale until the larger jaws of the caliper are fully pressed against each other. To do this find the mark on the vernier scale which lines up perfectly with a mark on the main scale. How To Use Vernier Caliper In Right Way Step-by-Steps. The error is commonly about 0.05 mm which is pretty accurate. Record all of the readings. Reading the caliper is a two-step process: The main scale contributes to the main number and one decimal place. 8/15/13. Manually operated traditional analogue vernier calipers are standard for highly precise manual calculation and theory if vernier scale. Step 1: Holding the Caliper This is the proper way to hold a caliper. Do not use simply because it is handy. Next place the correct size micrometer standard onto the surface plate and extend the caliper above it, then close the caliper until it is just touching it. Note: The measurement-reading technique described in this post will be similar for vernier calipers which output measurement readings in inches. Alow the caliper to align with the hole or rip that is being measured. This distance is worked out by utilizing the outer measuring sides of the Vernier caliper i.e. Make sure the measuring faces are clean. Ensure that the left side head of the caliper is at 90 degrees to the edge of the upper step. The first one uses a vernier scale, while the second one uses a dial gauge, while the third one uses electronic components.Each of them looks different and has a … I understand the problems people have with reading vernier calipers. Vernier Caliper: 5 Fields Are Using It Interestingly, Vernier Caliper Parts Names & Possible Replacements, Online Shopping of Top Ten High Quality Industrial Vernier Calipers, Vernier Caliper Experiments, Example & Test, Vernier Caliper Practice for Finding Cylinders’ Dia & Volume, Vernier Caliper – Working, Calculation Of Least Count & Zero Error, Vernier Caliper Least Count & Length Reading Formula, Vernier Caliper Functions & Important Parts, Frequently Asked Questions About Vernier Calipers, Ten Insize Vernier Caliper Both Digital & Analogue. However, the accuracy varies according to the type of caliper used. We have already introduced the vernier caliper as a simple but brilliant tool for taking precise measurements which a normal ruler is incapable of. Taking Outside Measurements Using a Vernier Caliper: Measurement of depth with the help of a Vernier caliper: How To Take Inner Measurements Using A Vernier Caliper: How To Measure The Length of Cylinder Using a Vernier Caliper? Skip navigation ... How to use vernier caliper (ENG).avi - Duration: 3:44. Using the Vernier Caliper: a)Familiarize yourself with the part of vernier caliper: The primary jaws of the vernier caliper are used for measuring the external diameter. Learn how your comment data is processed. 1. In this article we will be taking an in depth look at the main features of a caliper and how to use one to take a reading. Required fields are marked *. We can be contacted via email at mim@mitutoyo.com, via phone at 888-MITUTOYO or 630-723-3620, or visit the Education home page. 3:44. 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