However, instead of counting up from zero as you did you find the positive zero error, count down from 25 to find the negative zero error. Find the mark on the Vernier scale that aligns with a mark on the main scale to identify your zero error. Because the zero of the Vernier scale sits to the left of the zero on the main scale, you know the caliper has a negative zero error. Finding Negative Zero Error: To find a negative zero error, close the jaws of the caliper.So, you will need to subtract 3/1000 from your final measurement to find the true measurement. For example, if the aligning mark on the Vernier scale is 3/1000 (0.003), the zero error is +0.003. Find the mark on the Vernier scale that aligns with a mark on the main scale. Because the zero of the Vernier scale sits to the right of the zero on the main scale, you know the caliper has a positive zero error. Finding Positive Zero Error: To find a positive zero error, close the jaws of the caliper.The Spruce Home Improvement Review Board.Keep graduations and markings on all calipers clean and legible.Store calipers in separate containers provided.When the jaws come in contact with the workpiece, the measurement can be read directly from a digital display. The vernier caliper should not be used to measure the outside diameter of a cylinder having a radius greater than the depth of the caliper opening.ĭigital vernier caliper is very accurate and does involve the computations needed by a standard vernier caliper. To this must be added the number of divisions from the zero line on the vernier scale to the line which is coincident witha line on the main scale, in this case 15 divisions which equals 0,015in the total reading is therefore:
#Vernier caliper reading plus
This is shown as 3,00in plus 0,300in plus 2*0,025in which equals 3,35in. To read a measurement note the position of the zero line on the vernier scale in relation to the main scale. The difference in length between a small division on the main scale and the vernier scale is 0,025- 0,024 = 0,001in. Each of these has a length of 0,6in divided by 25 = 0,024in. On the vernier scale 0,6in is divided into 25 parts. Each tenth is divided into four giving 0,1in. The main scale on the vernier is graduated and numbered in inches with each inch graduated and numbered in tenths (0,1in). MEASURING WITH IMPERIAL VERNIER CALIPER TO WITHIN 0,001in So the reading is 28mm plus 30 divisions of 0,02mm
Note the line on the vernier scale which is coincident with a line on the main scale.ģ0th line concides with a line on the main scale. The zero of the vernier scale immediately preceding 28mm. To this (28mm) must be added the decimal reading on the vernier scale.
To read the measurement note the main scale measurement immediately preceding the zero line on vernier scale.
The difference between one division on the main scale and one division on the metric vernier scale is 1/50 or 0,02mm. Each division is 49/50, which is equal to 0,98mm.
MEASURING WITH METRIC VERNIER CALIPER TO WITHIN 0,02mmĮach division on the main scale is 1mm. The metric vernier scale is 49mm long and divided into 50 equal parts. Vernier calipers work like slide caliper. Vernier calipers are available with metric and imperial graduations. If you need 3D model of a Vernier caliper, please visit this page: 3D model of Vernier caliper
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