1

Measurement and QualityCourse

2

Measurement and Quality Course

• Course will contain 4 modules.

• Each module will represent one month of activity for a typical college class.

• Each module will break down into four weeklong sections.

• Module content organized and partitioned logically.

3

Measurement and Quality Course

Outline Overview

I. Module 1 – Introduction to MeasurementA. History of Measurement

B. Systems of Units – SI and English

C. Blueprint Reading / Scales

D. Tolerances and Fits

E. Statistics and Error Analysis

4

Measurement and Quality Course

II. Module 2 – Length MeasurementA. Rulers / Scales

B. Vernier Instruments

C. Micrometer Instruments

D. Depth and Height Gages

E. Gage Blocks

F. Statistics and Quality in Length Measurement

5

Measurement and Quality Course

III. Module 3 - Angular Measurements, Thread Metrology, and Optics

A. Angular Units and ConversionsB. Measuring Angles with Gage Blocks, Plain

Protractors, Sine Bars & Plates, and Vernier Protractors

C. Thread MetrologyD. Optical Theory of Light WavesE. Waviness Measurement with Optical FlatF. Statistics and Quality in Angular and Thread

Measurement

6

Measurement and Quality Course

IV. Module 4 – CMM and InspectionA. Coordinate Measuring Machines

B. Roundness Checking

C. Inspection Using an Optical Comparator and Measuring Microscope

D. Statistical Process Control

7

Measurement and Quality Course

Three Step Learning Cycle1. Exploration

2. Dialog

3. Application

8

Measurement and Quality Course

Module 2 – Length Measurement Snapshot

Exploration: Vernier InstrumentsMeasurement requires various kinds of measurement

tools. For many applications, the discrimination of a rule or slide caliper is insufficient. One of the ways we can attain greater discrimination is through the use of a vernier scale. A slide rule calipers provided with a vernier scale is known as a vernier caliper.

9

Measurement and Quality Course

Exploration con’t

Materials: Vernier calipers, Dial calipers.

Parts: Bolts of various sizes.

Pick two parts and measure two dimensions on each. Record the results on in the table below and answer the following questions.

10

Measurement and Quality Course

Exploration: Questions

1. Are there any differences in the instruments from rules or slide calipers? Describe.

2. Do the instruments have the same graduations? How do they differ?

3. What might be the discriminations of the instruments?

11

Measurement and Quality Course

Dialog: Vernier Instruments• Highlight discrimination, accuracy, precision, and

repeatability.• Discussion of vernier principle.• Reading an instrument with a vernier scale.• Sources of error.• Proper measuring techniques for vernier calipers.

12

Measurement and Quality Course

Application: Measuring with Vernier Calipers

Materials: Vernier Calipers

Parts: PRIME Part, Bolts of Various Sizes

Drawings: Part Drawings with Critical Dimensions Defined

13

Measurement and Quality Course

Application con’t

Look over the supplies parts and associated drawings. Identify the critical dimensions as marked. Using the instruments provided, measure the critical dimensions and mark your results on the data sheet. When complete, notify the instructor to supply the correct dimensions, and then answer the following questions.

14

Measurement and Quality Course

Application: Questions

1. Were you able to accurately measure all the dimensions with the supplied calipers? If not, what dimension(s) were difficult to measure?

2. Compare how close your measurements were to the actual values. Calculate the error for each. What might be the cause of any differences between your measured and the actual values?

3. Comment on the precision, accuracy, and repeatability of your measurements.

15

Measurement and Quality Course

Questions???