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Metrology Lab – Slide 1ME313 – Metals Processing - Lab Last Modified by PAN 2/19/05
Introduction to Metrology
ME 313 Manufacturing Processes
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
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 thesein-order to win
Is this Accurate or Precise???
AccuratePrecise Accurate and Precise
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
Metrology Lab – Slide 5ME313 – Metals Processing - Lab
How to Read a MicrometerVernier scale ***Resolution 0.0001” ***
Reading B2 x 0.1000 = 0.20002 x 0.0250 = 0.0500Final Reading = 0.2500
Reading C2 x 0.1000 = 0.20002 x 0.0250 = 0.05007 x 0.0001 = 0.0007
= 0.2507Final Reading
Metrology Lab – Slide 6ME313 – Metals Processing - Lab
QUIZ TIME
A
B
Reading A2 x 0.1000 = 0.20003 x 0.0250 = 0.075024 x 0.0010 = 0.0240
= 0.2991Final Reading
1 x 0.0001 = 0.0001
Reading B3 x 0.1000 = 0.30000 x 0.0250 = 0.0000
= 0.3001Final Reading
1 x 0.0001 = 0.00010 x 0.0010 = 0.0000
What is the Resolution???
Metrology Lab – Slide 7ME313 – Metals Processing - Lab
The Vernier Cailiper
Readline
2 * 1.000 = 2.0002 * 0.100 = 0.200
10 * 0.001 = 0.0103 * 0.025 = 0.075
2.285
+
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
VernierMicrometer
VernierCaliper
0.0001” 0.001”Resolution :
*Should be included in the lab report*