Exam 1 Review

Question 1

Heavy dark line that divides part view to expose internal geometries

Answer 1

Sectional line

Question 2

Reference features usually defined by the critical surfaces on a part. These surfaces will be the origin for
dimensioning other features.

Answer 2

Datum

Question 3

In the three-plane datum system, the primary (first) datum constrains _____ degree(s) of freedom

Answer 3

3

Question 4

In the three-plane datum system, the secondary (second) datum constrains _____ degree(s) of freedom

Answer 4

2

Question 5

In the three-plane datum system, the tertiary (third) datum constrains _____ degree(s) of freedom

Answer 5

1

Question 6

In the three-plane datum system, the primary (first) datum constrains which degrees of freedom?

Answer 6

1 translation in Z
1 rotation in u
1 rotation in v

Question 7

In the three-plane datum system, the secondary (second) datum constrains which degrees of freedom?

Answer 7

1 translation in X
1 rotation in w

Question 8

In the three-plane datum system, the tertiary (third) datum constrains which degrees of freedom?

Answer 8

1 translation in Y

Question 9

In the three-plane datum system, the primary (first) datum has a minimum of _____ point contact

Answer 9

3

Question 10

In the three-plane datum system, the secondary (second) datum has a minimum of _____ point contact

Answer 10

2

Question 11

In the three-plane datum system, the tertiary (third) datum has a minimum of _____ point contact

Answer 11

1

Question 12

Theoretically, the exact size we would prefer

Answer 12

Basic Size

Question 13

Maximum and minimum dimensions acceptable

Answer 13

Limits of size

Question 14

Total amount of variation about the Basic Size we can “tolerate”

Answer 14

Total tolerance

Question 15

The intended difference in size of mating parts

Answer 15

Allowance

Question 16

Specifying the maximum and minimum dimensions only

Answer 16

Limit dimensioning

Question 17

Specifying the basic size +/- tolerance values

Answer 17

“Plus and Minus” Dimensioning

Question 18

There is always space (The hole is larger than the cylinder)

Answer 18

Clearance fit

Question 19

There is never space (The hole is smaller than the cylinder)

Answer 19

Interference fit

Question 20

There may be a space or there may be interference

Answer 20

Transition fit

Question 21

Comparing an unknown quantity to a known standard

Answer 21

Measurement

Question 22

Examining a part to evaluate its conformity to design

Answer 22

Inspection

Question 23

Determining if a part or feature meets the design specifications

Answer 23

Gaging

Question 23

If I have a measurement instrument, what aspects of the instrument do I care about?

Answer 23

Resolution
Stability

Question 24

When a measurement device is checked against a known standard

Answer 24

Calibration

Question 25

Examples of known standards

Answer 25

Gauge blocks, gauge pins Government standards (NIST)

Question 26

Linear measurement is an inspection by

Answer 26

variables

Question 27

Gaging instruments are an inspection by

Answer 27

attributes

Question 28

Provides information about the characteristics of the part and the process but is often slow and cumbersome

Answer 28

Measuring

Question 29

Can be much quicker but provides less information about the part and fabrication process

Answer 29

Gaging

Question 30

There is _____ in all measurements

Answer 30

variability

Question 31

The variation in measurement when: * Using one measurement instrument * Used by the same operator * Measuring the same characteristics of a part

Answer 31

Repeatability (Measurement Variation)

Question 32

Multiple operators: * Using the same measuring instrument * Measuring the same characteristics of a part

Answer 32

Reproducibility (Operator Variation)

Question 33

Used in nondestructive tests

Answer 33

Crossed R&R Study

Question 34

Used in destructive testing

Answer 34

Nested R&R Study

Question 35

We have to make the assumption the parts are reasonably ______ in Gage R&R studies

Answer 35

Homogeneous

Question 36

The operator measurement mean deviates from the actual part dimension

Answer 36

Accuracy

Question 37

Potential causes of accuracy

Answer 37

* Lack of calibration * Thermal effects

Question 38

Variations caused by changes over time periods

Answer 38

Measurement Stability

Question 39

Accuracy of an instrument over the entire range of measurement

Answer 39

Linearity

Question 40

Considered the modern approach to dims and tolerance

Answer 40

Geometric Dimensioning and Tolerancing

Question 41

Form Tolerances

Answer 41

Straightness Flatness Circularity Cylindricity

Question 42

Orientation Tolerances

Answer 42

Angularity Perpendicularity Parallelism

Question 43

Primary Datum: Planar surface that fixes the _____ orientation of the part

Answer 43

Spatial

Question 44

Secondary Datum: Planar surface that fixes the _____ orientation of the part

Answer 44

Planar

Question 45

Tertiary Datum: Planar surface that fixes the _____ location of the part

Answer 45

Planar