Applied Math I - University of Oxford

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

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

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

While both micrometers and calipers can make outside length measurements... Calipers can also make inside measurements...

and depth measurements. There are three types of calipers. The vernier caliper:

The dial caliper: and the digital electronic caliper.

The vernier caliper takes the most skill to read, and this is the type you will be using in experiment X.3. These are the main features of a typical vernier caliper: Small

jaws (for inside Depth gauge Metric vernierMetric scale fixed scale measurements) Beam Jaws (for English

outside vernier scalescale English fixed measurements) Introduction and Example 1

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

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

Reading a caliper Use the zero line on the vernier to locate your position on the fixed scale. Reading a caliper However, since your final reading is Each number printed on the normally in millimeters, you need view

metric scale represents centimeters. these amounts as millimeters. 6 cm 7 cm 8 cm 9 cm 10etc. cm

Reading a caliper Just mentally add a 0 (zero) by each centimeter number. 60 mm70 mm 80 mm90 mm 100 mm 0 0

0 0 0 Reading a caliper: metric Since there are ten spaces between each numbered interval, these smallest spaces must be 1 mm each.

For example, For this example, note the ten this is 92on mm... The smallest interval thisinterval. would be 9193

mm... mmin this spaces scale is 1mm. etc. 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. 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 .25 .20 mm mm mm etc. .30 .35mm

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

lines, line up the best. 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

Example 2 Reading a caliper Lets try another one Reading a caliper

The zerothe line fixed is close, scale. but not quite First take a reading from Use up to, the 20 mm line. It has gone the zero line from the vernier to help. beyond the 19 mm line however.

Remember that we need to read the fixed scale in terms of millimeters. 19 mm 0 0 0

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

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

Example 3 Reading a caliper: metric Lets go through one more example. Reading a caliper: metric

Use the zero line from the vernier scale The zero line is directly above the to help get a reading on the that fixed scale. we need to read the

8 mmRemember line. fixed scale in terms of millimeters. 8 mm Reading a caliper: metric Thats it! Since the zero line on the vernier matched

The on final reading 8.00 mm up with a line the fixed isscale, you quit right there. Practice

Thescale zero line reading. is close to, but does Start with the fixed not quite reach the 67 mm line. It hasRemember gone beyond mmtoline thatthe

we66 need read the however. fixed scale in terms of millimeters. 66 mm 0 0

0 Reading a caliper: metric This is read as .60 mm It appears that these two lines, line up the best.

To finish, read the vernier scale. 66 mm .60 mm Reading a caliper: metric The final reading then is 66.60 mm. 66 mm + .60 mm

66.60 mm

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