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ADVANCED MNFG > GD&T > Flashcards

GD&T Flashcards

1
Q

What does GD&T Stand for

A

Geometric Dimensioning & Tolerancing

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2
Q

What is Tolerancing

A

The total amount a specific Dimension is permitted to vary

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3
Q

Why do you need to tolerance?

A

Because every dimension cannot be perfect

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4
Q

What factors influence change in fit?

A

Temperature, humidity, atmosphere, dust, corrosion, wear, lubrication, etc

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5
Q

What are the two ways that a fit can be specified

A

Hole and Shaft basis

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6
Q

What are the 2 major fit systems?

A

ANSI and ISO

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7
Q

What are the 3 ISO general groups?

A

Clearance, Transition and interference fits

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8
Q

What are the 3 ANSI general groups

A

“RC”, locational and “FN” fits

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9
Q

“40H8” what does the first number mean

A

The basic size of the component

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10
Q

“40H8” What does the letter mean?

A

The letter indicates the class of fit (UPPER CASE FOR HOLES, lower case for shafts)

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11
Q

“40H8” what does the second number mean?

A

The second number indicates the international tolerance (IT) Grade

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12
Q

what kind of fit is “H11/c11”

A

a loose-running fit for wide commercial tolerances or allowances on external members

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13
Q

what kind of fit is “H9/d9”

A

free running fit not for use where accuracy is essential, but good for large temperature variation, high running speeds, or heavy journal pressures

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14
Q

what kind of fit is “H8/f7”

A

Close running fit for running on accurate machines and for accurate location at moderate speeds and journal pressures

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15
Q

what kind of fit is “H7/g6”

A

Sliding fit not intended to run freely, but to move and turn freely and locate accurately

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16
Q

what kind of fit is “H7/h6”

A

Locational clearance fit provides snug fit for locating stationary parts; but can be freely assembled and disassembled

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17
Q

what kind of fit is “H7/k6”

A

locational transition fit for accurate location, a compromise between clearance and interference

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18
Q

what kind of fit is “H7/n6”

A

locational transition fit for more accurate location where greater interference is permissible

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19
Q

what kind of fit is “H7/p6”

A

Locational interference fit for parts requiring rigidity and alignment with prime accuracy of location but without special bore pressure requirements

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20
Q

what kind of fit is “H7/s6”

A

Medium drive fit for ordinary steel parts or shrink fits on light sections, the tightest fit usable with cast iron

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21
Q

what kind of fit is “H7/u6”

A

Force fit suitable for parts which can be highly stressed or for shrink fits where the heavy pressing forces required are impractical

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22
Q

What does a metric limit tolerance value specified on one line look like

A

12.50±0.25

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23
Q

what does a stacked inch limit tolerance value look like

A

1.062
1.000

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24
Q

what’s the specified dimension of : 76±0.4

A

76

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25
Q

what’s the lower limit of : 76±0.4

A

75.6 (76-0.4)

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26
Q

Whats the upper limit of: 76±0.4

A

76.04 (76+0.4)

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27
Q

Whats the tolerance of 76±0.4

A

0.8 (76.04-75.6=0.8)

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28
Q

What type of dimension appears on a drawing in parentheses?

A

A reference dimension

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29
Q

What does an inch dimension with an equal bilateral tolerance look like?

A

0.750±0.005

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30
Q

what does ISO stand for

A

International standards organization

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31
Q

what does ANSI stand for

A

The American National Standards Institute

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32
Q

Why use GD&T?

A

Proper use guarantees the form, fit and function of a product without the need to make assumptions or interpret requirements

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33
Q

What is a feature?

A

a feature is a general term that applies to a physical portion of a part. (an edge, surface, vertex, etc)

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34
Q

What is a feature of size (FOS)

A

one cylindrical or spherical surface; a set of 2 opposed elements or parallel surfaces that are associated with a size dimension

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35
Q

When is MMC most often used?

A

when FOS is used in an assembly

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36
Q

When is LMC most often used?

A

LMC is often specified to ensure a minimum wall thickness on a part

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37
Q

When is RFS used?

A

RFS is often applied to ensure symmetry, and is the default if MMC and LMC aren’t specified

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38
Q

What is basic dimensioning?

A

The basic dimension is the theoretical exact size that the feature of size should be

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39
Q

How are basic dimensions indicated on drawings?

A

Enclosed in rectangles

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40
Q

What are tolerance zones?

A

They’re pictorial representation of the limits of size for a particular tolerance

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41
Q

What is the standardization of engineering drawing symbols controlled by

A

ASME Y14.5

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42
Q

What is this Symbol: Ø

A

Diameter

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43
Q

What is this Symbol: R

A

Radius

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44
Q

What is this Symbol: SR

A

Spherical Radius

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45
Q

What is this Symbol: SØ

A

Spherical Diameter

46
Q

What is this Symbol: CR

A

Controlled Radius

47
Q

What is this Symbol: X

A

Places or by

48
Q

What is this Symbol: l_l

A

Counterbore

49
Q

What is this Symbol: lSFl

A

Spotface

50
Q

What is this Symbol: V

A

Countersink

51
Q

What is this Symbol: a square

A

Square shape

52
Q

What is this Symbol: ___
l
V

A

Depth or deep

53
Q

What is this Symbol: <-O

A

Dimension Origin

54
Q

What is this Symbol: ()

A

Reference

55
Q

Characteristics of FORM

A

Never has a datum associated

56
Q

Characteristics of PROFILE

A

SOMETIMES has a datum associated

57
Q

Characteristics of LOCATION

A

ALWAYS has a datum associated

58
Q

Characteristics of ORIENTATION

A

ALWAYS has a datum associated

59
Q

Characteristics of RUNOUT

A

ALWAYS has a datum associated although datum may not be obvious

60
Q

Material Condition: (M)

A

At maximum material condition

61
Q

Material Condition: (L)

A

at least material condition

62
Q

Material Condition: (P)

A

Projected tolerance zone

63
Q

Material Condition: (F)

A

free state

64
Q

Material Condition: (T)

A

tangent plane

65
Q

Material Condition: Ø

A

Diameter

66
Q

Material Condition: SØ

A

Spherical diameter

67
Q

Material Condition: R

A

Radius

68
Q

Material Condition: SR

A

spherical radius

69
Q

Material Condition: CR

A

Controlled Radius

70
Q

Material Condition: ()

A

Reference

71
Q

Material Condition: {ST}

A

Statistical Tolerance

72
Q

Material Condition: <–>

A

Between

73
Q

What is a datum

A

a datum is a reference from which measurements are made (assumed to be perfect)

74
Q

What is a datum feature?

A

An actual feature that is used to establish a datum, like a face, bore or shaft

75
Q

What are datum symbols?

A

Symbols that are used to identify datum and in situations where more than 1 datum is used, their order of precedence is shown in the feature control frame

76
Q

What is a datum centre plane?

A

A plane that splits a symmetrical feature such as a slot or tab (needs a leader)

77
Q

What are the 6 degrees of freedom

A

The two rotational directions around the each of the xyz axis

78
Q

What is the symbol for coplanar surface datums?

A

L-M in the control frame

79
Q

What does A mean in the feature control frame?

A

Primary datum reference

80
Q

What does B mean in the feature control frame?

A

Secondary Datum reference

81
Q

What do letters connected by ‘-‘ in the feature control frame mean?

A

‘A-B’ multiple datum reference

82
Q

When do coaxial features exist?

A

When more than 1 features share a common axis

83
Q

for an external datum feature, how is the datum centre plane created?

A

Its established by 2 parallel planes at the minimum separation

84
Q

for an internal datum feature, how is the datum centre plane created?

A

its established by 2 parallel planes at maximum separation

85
Q

A parts tolerance should be as liberal as possible to be?

A

Consistent with the parts function

86
Q

The limits of the size of a feature controls?

A

the amount of variation in both size and form

87
Q

What is the “envelope rule”?

A

if the feature is at MMC its geometric form must be perfect

88
Q

What does RFS mean

A

Regardless of feature size

89
Q

What does RMB mean

A

Regardless of material boundary

90
Q

What features are applied only on a RFS basis

A

Circularity, cylindricity, profile, circular runout, total runout, concentricity & symmetry

91
Q

What are the exceptions to rule #1 Extreme form variations

A

*parts that have stock sizes: sheet metal, gaskets, tubing, etc
*a feature of size of a non-rigid part (rubber)

92
Q

What can override rule #1 Extreme form variations

A

*apply a straightness control to the FOS
*By adding a special note to the FOS
*By means of the “independency” symbol (I)

93
Q

What does FOS mean?

A

Features of Size

94
Q

What is the symbol for RFS?

A

It doesn’t have one, its assumed when no other condition is specified

95
Q

What is Rule #2 “all applicable geometric tolerances”

A

RFS applies, unless MMC or LMC is specified

96
Q

What is Bonus Tolerance?

A

It allows the tolerance available to vary with the actual size of the part

97
Q

When is Bonus Tolerance permissible

A

When a MMC or LMC modifier is used in the tolerance portion of the feature control frame

98
Q

What is a bonus tolerance derived from?

A

from the FOS tolerance

99
Q

What is flatness

A

a form of tolerance and it controls the whole surface by means of 2 planes specifying the tolerance

100
Q

Flatness Independency

A

defining size tolerance as independent of form tolerance

101
Q

What is circularity?

A

the control of “out-of-roundness”

102
Q

How is circularity measured?

A

it is measured at any/each cross section perpendicular to the axis

103
Q

Does circularity reference a datum?

A

No, it controls form

104
Q

How large can the circularity tolerance be?

A

It must be less than a tolerance of size

105
Q

How is circularity show in the control frame?

A

a circle followed by a dimension

106
Q

Where does Free State Variation exist?

A

Where a part distorts when manufacturing forces are removed

107
Q

How is parallelism gauged?

A

Its gauged relative to a datum or another feature (Face A is parallel to face B)

108
Q

Parallelism geometric tolerance is defined by?

A

Parallel planes or cylindrical zones that are parallel to a datum plane

109
Q

Theoretically what is a tangent plane?

A

Its an exact plane that is considered to “lie” on the high points of the feature surface

110
Q

How can perpendicularity be specified?

A

Its always specified RFS and a datum is required

ADVANCED MNFG (2 decks)

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