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Metrology > Final Test > Flashcards

Final Test Flashcards

1
Q

What is runout?

A

Deviation of surface elements relative to a datum axis.

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2
Q

What is Circular runout?

A

Radial space between two coaxial circles AND/OR
Axial space between two coaxial circles (offset axially).

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3
Q

What is Total runout?

A

Radial space between two coaxial cylinders AND/OR
Axial space between two planes (offset axially).

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4
Q

TRUE OR FALSE:
A total runout must reference a datum axis.

A

True

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5
Q

TRUE OR FALSE:
A circular runout tolerance affects the cylindricity of a cylindrical surface.

A

False

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6
Q

When establishing a datum axis, a single diameter is used where the ____________________ orients the parts in assembly.

A

Diameter

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7
Q

Where circular runout is applied to a planar surface at a(n) ____________________ angle to a datum axis, it controls deviations of the circular elements of the plane for wobble, which includes orientation and form deviations of the circular elements.

A

Right

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8
Q

What are three common real-world applications of circular and total runout tolerance?

A
  1. Clearence between rotating parts and stationary parts
  2. Gear Mesh
  3. Rotating parts for alignment
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9
Q

Which surface deviations may be limited by total runout applied to a surface perpendicular to the datum axis?
A)Circularity and straightness.
B)Circularity and flatness.
C)Perpendicularity and flatness.
D)Location, perpendicularity, and straightness.

A

C) Perpendicularity and flatness

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10
Q

TRUE OR FALSE:
The tolerance zone shape for concentricity is the space within a cylinder.

A

True

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11
Q

TRUE OR FALSE:
The tolerance zone for a concentricity tolerance is the space between two concentric cylinders.

A

False

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12
Q

The tolerance zone shape for symmetry is the space between two ____________________ planes.

A

Parallel

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13
Q

One difference between position (RFS) and concentricity is that position controls the location of the axis of the unrelated actual mating envelope, and concentricity controls the location of a cloud of ____________________ points.

A

Median

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14
Q

What are two similarities between position and symmetry?

A

1.Shape of tolerance zone
2.Both tolerance limitations

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15
Q

Two types of geometry attributes affected by a concentricity or symmetry tolerance are:

A)Location and orientation.
B)Size and form.
C)Concentricity and symmetry.
D)None of the above.

A

A) Location and orientation

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16
Q

What is Runout tolerance?

A

Control functional relationship of a surface relative to a datum axis established from a datum feature at RMB.

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17
Q

What is Circular runout tolerance?

A

Limits high to low point deviation of circular elements of a surface of revolution or a of planar surface perpendicular to and intersecting the datum axis.

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18
Q

What is Total runout tolerance?

A

Limits high to low point deviation of all surface elements on a cylindrical surface or of a planar surface perpendicular to and intersecting the datum axis.

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19
Q

What are Common runout tolerance zones?

A

Space between two coaxial circles/ cylinders AND
Space between two axially offset coaxial circles or planes.

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20
Q

What is Concentricity?

A

Median points of all diametrically opposed elements of a surface of revolution are congruent with a datum axis or centre point.

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21
Q

What is Symmetry?

A

All median points of all opposed elements of two or more feature surfaces are congruent with a datum axis or centre plane.

22
Q

Concentricity and symmetry do what?

A

Limit the location of median points relative to a datum.

23
Q

TRUE OR FALSE:
A circular runout tolerance can be applied to circular elements and planar surface elements that are perpendicular to the datum axis.

A

True

24
Q

TRUE OR FALSE:
A total runout tolerance may have a bonus tolerance.

A

False

25
Q

TRUE OR FALSE:
Two tolerance zone shapes for a total runout tolerance are the space between two coaxial cylinders and the space between two parallel planes.

A

True

26
Q

TRUE OR FALSE:
Where circular runout is applied to a cylindrical surface, the tolerance zone is two coaxial circles centered on the datum axis.

A

True

27
Q

A(n) ____________________ runout tolerance is a geometric tolerance that limits the high to low point deviation of all surface elements of a cylindrical surface, or all surface elements of a planar surface that is perpendicular to and intersects the datum axis. It is measured normal to the surface elements.

A

Total

28
Q

In certain applications, the function of a part requires defining the circular runout deviation of a diameter relative to a datum axis. In this application, the ____________________ must meet its size requirements.

A

Diameter

29
Q

TRUE OR FALSE:
A concentricity tolerance must be applied with datum feature references.

A

True

30
Q

TRUE OR FALSE:
Concentricity and symmetry tolerances do not affect orientation and form of the axis or center plane of the toleranced feature of size (e.g., parallelism, perpendicularity, straightness or flatness).

A

False

31
Q

A(n) ____________________ point is the mid-point of a two-point measurement.

A

Median

32
Q

What are two examples of real-world applications of concentricity or symmetry tolerances on a drawing?

A
  1. Limit the deviations of median points
  2. Centre plane for balance of a high speed rotating part
33
Q

The “cumulative effect” of runout tolerances applied to a cylindrical surface refers to the fact that a runout tolerance affects both form and ____.
A)Location deviations.
B)Bonus tolerances.
C)Size deviations.
D)None of the above.

A

A) Location deviations

34
Q

The midpoint of a two-point measurement is known as:
A)A centre point.
B)A midpoint.
C)A median point.
D)A datum point.

A

C) Median point

35
Q

A real-world application for concentricity tolerance is:
A)Assembly.
B)Support.
C)Balance of a high-speed rotation part.
D)Seal on a rotating part.

A

C) Balance of a high speed rotating part

36
Q

What is Parallelism?

A

Surface, axis, or center plane equidistant at all points from a datum plane or axis.

37
Q

What is Parallelism tolerance?

A

Limits the amount of deviation of a surface, axis, or center plane.

38
Q

What are 3 common real-world applications of a parallelism tolerance?

A

1.Support (distribute load & reduce wear)
2.Assembly (maintain uniform gap)
3.Performance (linear motion)

39
Q

Where parallelism is applied to a planar surface, what is Tolerance zone?

A

Space between two parallel planes.
Parallel to primary datum plane.

40
Q

Where parallelism is applied to a planar surface, what is Tolerance value?

A

Distance between tolerance zone planes.

41
Q

Tolerance limits what?

A

Flatness of surface

42
Q

Where parallelism is applied to a hole diameter at MMC the tolerance zone is a what?

A

Virtual condition

43
Q

Where parallelism tolerance is applied to a planar surface it controls what?

A

Orientation and flatness

44
Q

Angularity is what?

A

Surface, axis, or centre plane at the specified angle to a datum plane or axis.

45
Q

Angularity tolerance limits what?

A

Deviation of surface, axis, or centre plane.

46
Q

True position is what?

A

Theoretically exact location of a feature of size established by basic dimensions.

47
Q

Position tolerance does what?

A

Defines the allowable deviation of a feature of size from true position and May limit orientation deviation.

48
Q

A position tolerance must what?

A

1.Be applied to a feature of size or pattern of features of size
2.Have location and spacing of feature(s) of size defined by basic dimensions
3.Have datums specified
4.Have modifiers specified

49
Q

Flatness is defined as what?

A

A perfect plane.

50
Q

Straightness is defined as what?

A

a perfect line element.

51
Q

Flatness Tolerance is what?

A

A geometric tolerance that defines allowable flatness deviation on planar surface or derived median plane.

52
Q

Straightness Tolerance is defined as what?

A

allowable straightness deviation on individual surface elements or on a derived median line.

Metrology (1 decks)

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