28 Dec 2010 ... To learn how to use a caliper to accurately measure dimensions and ... the lab
report instructions). 2. Worksheets a. Caliper b. Micrometer.
IE 337: Materials and Manufacturing Processes
Lab # 1
Metrology Background: Metrology is defined by the International Bureau of Weights and Measures (BIPM) as “the science of measurement, embracing both experimental and theoretical determinations at any level of uncertainty in any field of science and technology.” In this course you will be conducting many experiments in material processing. Many of the experiments will require the use of metrology equipment to collect data. Objective: 1. To learn how to use a micrometer to accurately measure dimensions. 2. To learn how to use a caliper to accurately measure dimensions and depth. 3. To learn how to use a surface roughness tester to measure surface roughness. Equipment and Materials: 1. Caliper 2. Micrometer 3. Various parts for measurement Procedure: Caliper 1. Learn how to read caliper by watching demonstration given by lab instructor. 2. Measure each part provided three times. 3. Enter values on worksheet provided. Micrometer 1. Learn how to read caliper by watching demonstration given by lab instructor. 2. Measure each part provided three times. 3. Enter values on worksheet provided. Lab Deliverables: 1. Prepare a report detailing the lab activity, observations, results and difficulties faced (follow the lab report instructions). 2. Worksheets a. Caliper b. Micrometer How to read a Micrometer measuremen The spindle of an inch-system micrometer has 40 threads per inch, so that one turn moves the spindle axially 0.025 inch (1÷40 = 0.025), equal to the distance between two graduations on the frame. The 25 graduations on the thimble allow the 0.025 inch to be further divided, so that turning the thimble through one division moves the spindle axially 0.001 inch (0.025÷25 = 0.001). Thus, the reading is given by the number of whole divisions that are visible on the scale of the frame, multiplied by 25 (the number of thousandths of an inch that each division represents), plus the 1
December 28, 2010
IE 337: Materials and Manufacturing Processes
Lab # 1
Metrology number of that division on the thimble which coincides with the axial zero line on the frame. The result will be the diameter expressed in thousandths of an inch. As the numbers 1, 2, 3, etc., appear below every fourth sub-division on the frame, indicating hundreds of thousandths, the reading can easily be taken mentally.
Suppose the thimble were screwed out so that graduation 2, and three additional sub-divisions were visible (as shown in the image), and that graduation 1 on the thimble coincided with the axial line on the frame. The reading then would be 0.2000 + 0.075 + 0.001, or 0.276 inch.
2
December 28, 2010
IE 337: Materials and Manufacturing Processes
Lab # 1
Metrology Group Members: _______________________________________________________________ _______________________________________________________________ I. Purpose A.)
Providing a basic introduction to the use of measurement tools (calipers, micrometers etc.)
B.)
Introduction to Surface Roughness (Finish) Measurement
II. Procedures: Complete the lab sheet to report the laboratory outcomes. Dimensions of different geometries Locate the work-piece provided for this lab. Using a Caliper and Micrometer, measure the dimensions as shown on the sheet provided. Caliper Measurements Dimension 1
Measurement 3
2
Average
Std. Dev.
A B C D E F G H I J K L M N O P Q R S
3
December 28, 2010
IE 337: Materials and Manufacturing Processes
Lab # 1
Metrology Micrometer Measurements (upto 4 decimals) Dimension 1
Measurement 3
2
Average
Std. Dev.
A B C D E F G H I J K L M N O P Q R S
Reference: 1. www.wikipedia.org
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