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# mrtrology

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• 1) Students are responsible for the terminology and their definitions
• 1) Data re**** must take in account the resolution of the measuring device.
• ### mrtrology

1. 1. Metrology Lab – Slide 1ME313 – Metals Processing - Lab Last Modified by PAN 2/19/05 Introduction to Metrology ME 313 Manufacturing Processes
2. 2. Metrology Lab – Slide 2ME313 – Metals Processing - Lab Introduction • Definition : The science that deals with measurements and their units • Basic Terminology: • Reliability : The probability of achieving desired results . ( To increase reliability, accuracy and precision must also be increased.) • Resolution : The smallest graduation that a measuring device possesses
3. 3. Metrology Lab – Slide 3ME313 – Metals Processing - Lab Accuracy vs. Precision • Accuracy : Correctness (exactness) to the actual value. • Precision : Reproducibility / consistency of measurements In a dart game one needs to utilize both of these in-order to win Is this Accurate or Precise??? AccuratePrecise Accurate and Precise
4. 4. Metrology Lab – Slide 4ME313 – Metals Processing - Lab Micrometer Divisions of 0.025” Divisions of 0.100” Divisions of 0.001” Resolution is 0.001” Reading Line
5. 5. Metrology Lab – Slide 5ME313 – Metals Processing - Lab How to Read a Micrometer Vernier scale ***Resolution 0.0001” *** Reading B 2 x 0.1000 = 0.2000 2 x 0.0250 = 0.0500 Final Reading = 0.2500 Reading C 2 x 0.1000 = 0.2000 2 x 0.0250 = 0.0500 7 x 0.0001 = 0.0007 = 0.2507Final Reading
6. 6. Metrology Lab – Slide 6ME313 – Metals Processing - Lab QUIZ TIME A B Reading A 2 x 0.1000 = 0.2000 3 x 0.0250 = 0.0750 24 x 0.0010 = 0.0240 = 0.2991Final Reading 1 x 0.0001 = 0.0001 Reading B 3 x 0.1000 = 0.3000 0 x 0.0250 = 0.0000 = 0.3001Final Reading 1 x 0.0001 = 0.0001 0 x 0.0010 = 0.0000 What is the Resolution???
7. 7. Metrology Lab – Slide 7ME313 – Metals Processing - Lab The Vernier Cailiper Readline 2 * 1.000 = 2.000 2 * 0.100 = 0.200 10 * 0.001 = 0.010 3 * 0.025 = 0.075 2.285 +
8. 8. Metrology Lab – Slide 8ME313 – Metals Processing - Lab Homework Small Block Short Plate Long Plate Small Cylinder Large Cylinder Edge Thickness Edge Thickness Diameter Edge Thickness Diameter Vernier Micrometer Vernier Caliper 0.0001” 0.001”Resolution : *Should be included in the lab report*