Ie 305 Metrology Lab 1 Introduction To The Metrology Laboratory

IE 305 METROLOGY LAB 1 INTRODUCTION TO THE METROLOGY LABORATORY James Paul Johnson November 3rd, 2009

Introduction: In essence, metrology is the science of measurement. Through the use of different tools and equipment, experimenters can determine precise measurements for various fields and uses. This lab was designed to familiarize the lab section the metrology tools that will be used in the rest of the year. In this way, it can be better understood how to apply metrology in the future. Methodology: Three different tasks were assigned so as to foster familiarity with the metrology equipment. Firstly, four distinct work pieces would be analyzed using the various instruments. Those using the equipment were to make three repeated measurements on each topologically distinct dimension for each work piece. Secondly, a micrometer was to be opened to a random position. The measurement interpreted and recorded, and then a picture drawn to explain how the reading was arrived. Thirdly, it was to be determined the minimum number of gage blocks to realize the reference lengths of .8597 in. and 2.3012 in. Also, wringing of the gage blocks is to be practiced. There were seven tools that were utilized during this lab. These include gage blocks, the conventional and digital micrometer, the conventional and digital caliper, the depth micrometer, and the Vernier Height Gage. Results: Table 1: W_1 Distances to be Measured, Instrument Used, Measurements W_1

Instrument

Measurements

d_11

Digital Caliper

1.9720, 1.9715, 1.9655

d_12

Conventional Micrometer

1.3939, 1.3862, 1.3938

d_13

Digital Caliper

.1075, .1075, .1095

d_14

Digital Caliper

.1545, .1550, .1545

Table 2: W_2 Distances to be Measured, Instrument Used, Measurements W_2

Instrument

Measurements

d_21

Digital Caliper

1.9805, 2.0005, 1.9945

d_22

Digital Caliper

.9835, .9795, .9755

d_23

Digital Caliper

.8750, .8775, .8605

d_24

Digital Caliper

1.1270, 1.1280, 1.1290

d_25

Digital Caliper

Table 3: W_3 Distances to be Measured, Instrument Used, Measurements W_3

Instrument

Measurements

d_31

Digital Caliper

1.9524, 1.9502, 1.9569

d_32

Digital Micrometer

.8981, .8981, 1.0992

d_33

Depth Micrometer

.301, .298, .299

d_34

Conventional Caliper

.7565, .7565, .7555

Table 4: W_4 Distances to be Measured, Instrument Used, Measurements W_4

Instrument

Measurements

d_41

Vernier Height Gage

6.435, 6.430, 6.435

d_42

Vernier Height Gage

5.425, 5.4525, 5.428

d_43

Vernier Height Gage

3.156, 3.160, 3.158

Figure 1: Drawing of Micrometer Measurement for an Inch Micrometer

The inch and metric micrometers were set to a random position, which was .850 in. and 21.585 mm. To read the micrometer, the number of bars is counted on the sleeve, which in this case is the third line between 0 and 1, denoting .75. Then, thimble is read by taking off the number that is next to the line that matches up with the sleeve line. In this case, the number is 10, denoting . 10. To get the measurement, the two numbers are added, .75 + .10 to get .85 inches. The millimeter micrometer works in exactly the same manner, except that it uses millimeter denominations. Table 5: Gage Block Measurements, Reference Length, Total Number of Blocks As shown in the table, it takes 4 blocks to realize the reference length of .8597. Gage Block 1 Measurement

.5000

Gage Block 2 Measurement

.1500

Gage Block 3 Measurement

.1090

Gage Block 4 Measurement

.1007

Reference Length

.8597

Total Number of Blocks

4

Table 6: Gage Block Measurements, Reference Length, Total Number of Blocks As shown in the table, it takes 4 blocks to realize the reference length of 2.3012. Gage Block 1 Measurement

.1002

Gage Block 2 Measurement

.1010

Gage Block 3 Measurement

.1000

Gage Block 4 Measurement

2.0000

Reference Length

2.3012

Total Number of Blocks

4

Conclusion: As previously stated the purpose of this lab was to give this lab section hands on experience with the metrology equipment. As such, several measurements were taken of distinct work

pieces with each individual metrology tool. Also, gage blocks were counted out to realize two reference lengths, and wringing used to construct those lengths. Those who developed the familiarity with the metrology equipment will be able to use those tools for future labs. References: Lehtihet, E. A.. Lecture Notes. Fall Semester, 2009.