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The use of Metric Calipers Acknowledgment: Thanks to Southwest Wisconsin Technical College, who provided material from which this PowerPoint presentation is derived.

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Overview l In this presentation you will learn about: n The different kinds of calipers. n The components of a typical caliper. n Taking measurements from calipers.

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Introduction n Calipers are used to make precise length measurements. n Several different kinds of measurements can be made with a caliper...

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n While both micrometers and calipers can make outside length measurements...

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n Calipers can also make inside measurements...

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n …and depth measurements.

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n There are three types of calipers. n The vernier caliper:

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n The dial caliper:

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n …and the digital electronic caliper.

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n The vernier caliper takes the most skill to read, and this is the type you will be using in experiment X.3.

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n These are the main features of a typical vernier caliper: Jaws (for outside measurements) Small jaws (for inside measurements) Metric vernier scale Metric fixed scale English vernier scale English fixed scale Beam Depth gauge

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Introduction and Example 1

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Reading a Caliper n As you are about to see, using a vernier caliper is not difficult. n You only need to make two readings: one from the fixed scale and one from the vernier portion.

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Reading a caliper n Start by obtaining a measurement from the fixed scale... This is the fixed scale used for the metric readings.

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Reading a caliper n Use the zero line on the vernier to locate your position on the fixed scale.

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Reading a caliper Each number printed on the metric scale represents centimeters. 6 cm However, since your final reading is normally in millimeters, you need view these amounts as millimeters. 7 cm 8 cm 9 cm 10 cm etc.

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Reading a caliper Just mentally add a 0 (zero) by each centimeter number. 0 60 mm 0 0 00 70 mm 80 mm90 mm100 mm

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Reading a caliper: metric Since there are ten spaces between each numbered interval, these smallest spaces must be 1 mm each. For example, note the ten spaces in this interval. The smallest interval on this scale is 1mm. For example, this would be 91 mm... …this is 92 mm... …93 mm etc.

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Reading a caliper: metric As you can see in this problem, we have a fixed scale measurement of 63 mm. The reading is 63 mm since the zero line has gone just beyond the 63 mm mark, but hasnt reached the 64 mm mark.

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Reading a caliper To finish we must obtain a reading from the metric vernier scale. On this scale, each line represents 0.05 mm..05 mm.10 mm.15 mm.20 mm.25 mm.30 mm.35 mm etc.

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Reading a caliper We need now to look for the point at which the fixed scale lines up with the vernier. It appears that these two lines, line up the best. This is read as.50 mm

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Reading a caliper So based upon the two readings (one from the fixed scale, and one from the ruler) the length must be 63 mm +.50 mm = 63.50 mm 63 mm.50 mm + 63.50 mm

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Example 2

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Reading a caliper n Lets try another one

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Reading a caliper n First take a reading from the fixed scale. Use the zero line from the vernier to help. Remember that we need to read the fixed scale in terms of millimeters. The zero line is close, but not quite up to, the 20 mm line. It has gone beyond the 19 mm line however. 19 mm 0 0 0

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Reading a caliper: metric n To finish, read the vernier scale. It appears that these two lines, line up the best. This is read as.35 mm.35 mm

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19 mm Reading a caliper: metric n The final reading then is 19.35 mm..35 mm + 19.35 mm

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Example 3

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Reading a caliper: metric n Lets go through one more example.

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Reading a caliper: metric n Use the zero line from the vernier scale to help get a reading on the fixed scale. Remember that we need to read the fixed scale in terms of millimeters. The zero line is directly above the 8 mm line. 8 mm

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Reading a caliper: metric n Thats it! Since the zero line on the vernier matched up with a line on the fixed scale, you quit right there. The final reading is 8.00 mm

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Practice Problem

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Reading a caliper n Do this one on your own. Click to see the answer.

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n Start with the fixed scale reading. Remember that we need to read the fixed scale in terms of millimeters. The zero line is close to, but does not quite reach the 67 mm line. It has gone beyond the 66 mm line however. 66 mm 0 0 0 Reading a caliper

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66 mm Reading a caliper: metric n To finish, read the vernier scale. It appears that these two lines, line up the best. This is read as.60 mm.60 mm

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66 mm Reading a caliper: metric n The final reading then is 66.60 mm..60 mm + 66.60 mm

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