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IE 2480 > Exam 1 Review > Flashcards

Exam 1 Review Flashcards

1
Q

Heavy dark line that divides part view to expose internal geometries

A

Sectional line

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2
Q

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

A

Datum

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3
Q

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

A

3

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4
Q

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

A

2

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5
Q

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

A

1

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6
Q

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

A

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

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7
Q

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

A

1 translation in X
1 rotation in w

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8
Q

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

A

1 translation in Y

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9
Q

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

A

3

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10
Q

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

A

2

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11
Q

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

A

1

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12
Q

Theoretically, the exact size we would prefer

A

Basic Size

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13
Q

Maximum and minimum dimensions acceptable

A

Limits of size

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14
Q

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

A

Total tolerance

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15
Q

The intended difference in size of mating parts

A

Allowance

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16
Q

Specifying the maximum and minimum dimensions only

A

Limit dimensioning

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17
Q

Specifying the basic size +/- tolerance values

A

“Plus and Minus” Dimensioning

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18
Q

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

A

Clearance fit

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19
Q

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

A

Interference fit

20
Q

There may be a space or there may be interference

A

Transition fit

21
Q

Comparing an unknown quantity to a known standard

A

Measurement

22
Q

Examining a part to evaluate its conformity to design

A

Inspection

23
Q

Determining if a part or feature meets the design specifications

A

Gaging

23
Q

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

A

Resolution
Stability

24
Q

When a measurement device is
checked against a known standard

A

Calibration

25
Q

Examples of known standards

A

Gauge blocks, gauge pins
Government standards (NIST)

26
Q

Linear measurement is an inspection by

A

variables

27
Q

Gaging instruments are an inspection by

A

attributes

28
Q

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

A

Measuring

29
Q

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

A

Gaging

30
Q

There is _____ in all measurements

A

variability

31
Q

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

A

Repeatability (Measurement Variation)

32
Q

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

A

Reproducibility (Operator Variation)

33
Q

Used in nondestructive tests

A

Crossed R&R Study

34
Q

Used in destructive testing

A

Nested R&R Study

35
Q

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

A

Homogeneous

36
Q

The operator measurement mean deviates from the actual
part dimension

A

Accuracy

37
Q

Potential causes of accuracy

A
  • Lack of calibration
  • Thermal effects
38
Q

Variations caused by
changes over time
periods

A

Measurement Stability

39
Q

Accuracy of an instrument
over the entire range of
measurement

A

Linearity

40
Q

Considered the modern approach to dims and tolerance

A

Geometric Dimensioning and Tolerancing

41
Q

Form Tolerances

A

Straightness
Flatness
Circularity
Cylindricity

42
Q

Orientation Tolerances

A

Angularity
Perpendicularity
Parallelism

43
Q

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

A

Spatial

44
Q

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

A

Planar

45
Q

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

A

Planar

IE 2480 (2 decks)

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