Final Test Flashcards
What is runout?
Deviation of surface elements relative to a datum axis.
What is Circular runout?
Radial space between two coaxial circles AND/OR
Axial space between two coaxial circles (offset axially).
What is Total runout?
Radial space between two coaxial cylinders AND/OR
Axial space between two planes (offset axially).
TRUE OR FALSE:
A total runout must reference a datum axis.
True
TRUE OR FALSE:
A circular runout tolerance affects the cylindricity of a cylindrical surface.
False
When establishing a datum axis, a single diameter is used where the ____________________ orients the parts in assembly.
Diameter
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.
Right
What are three common real-world applications of circular and total runout tolerance?
- Clearence between rotating parts and stationary parts
- Gear Mesh
- Rotating parts for alignment
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.
C) Perpendicularity and flatness
TRUE OR FALSE:
The tolerance zone shape for concentricity is the space within a cylinder.
True
TRUE OR FALSE:
The tolerance zone for a concentricity tolerance is the space between two concentric cylinders.
False
The tolerance zone shape for symmetry is the space between two ____________________ planes.
Parallel
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.
Median
What are two similarities between position and symmetry?
1.Shape of tolerance zone
2.Both tolerance limitations
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) Location and orientation
What is Runout tolerance?
Control functional relationship of a surface relative to a datum axis established from a datum feature at RMB.
What is Circular runout tolerance?
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.
What is Total runout tolerance?
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.
What are Common runout tolerance zones?
Space between two coaxial circles/ cylinders AND
Space between two axially offset coaxial circles or planes.
What is Concentricity?
Median points of all diametrically opposed elements of a surface of revolution are congruent with a datum axis or centre point.
What is Symmetry?
All median points of all opposed elements of two or more feature surfaces are congruent with a datum axis or centre plane.
Concentricity and symmetry do what?
Limit the location of median points relative to a datum.
TRUE OR FALSE:
A circular runout tolerance can be applied to circular elements and planar surface elements that are perpendicular to the datum axis.
True
TRUE OR FALSE:
A total runout tolerance may have a bonus tolerance.
False
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.
True
TRUE OR FALSE:
Where circular runout is applied to a cylindrical surface, the tolerance zone is two coaxial circles centered on the datum axis.
True
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.
Total
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.
Diameter
TRUE OR FALSE:
A concentricity tolerance must be applied with datum feature references.
True
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).
False
A(n) ____________________ point is the mid-point of a two-point measurement.
Median
What are two examples of real-world applications of concentricity or symmetry tolerances on a drawing?
- Limit the deviations of median points
- Centre plane for balance of a high speed rotating part
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) Location deviations
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.
C) Median point
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.
C) Balance of a high speed rotating part
What is Parallelism?
Surface, axis, or center plane equidistant at all points from a datum plane or axis.
What is Parallelism tolerance?
Limits the amount of deviation of a surface, axis, or center plane.
What are 3 common real-world applications of a parallelism tolerance?
1.Support (distribute load & reduce wear)
2.Assembly (maintain uniform gap)
3.Performance (linear motion)
Where parallelism is applied to a planar surface, what is Tolerance zone?
Space between two parallel planes.
Parallel to primary datum plane.
Where parallelism is applied to a planar surface, what is Tolerance value?
Distance between tolerance zone planes.
Tolerance limits what?
Flatness of surface
Where parallelism is applied to a hole diameter at MMC the tolerance zone is a what?
Virtual condition
Where parallelism tolerance is applied to a planar surface it controls what?
Orientation and flatness
Angularity is what?
Surface, axis, or centre plane at the specified angle to a datum plane or axis.
Angularity tolerance limits what?
Deviation of surface, axis, or centre plane.
True position is what?
Theoretically exact location of a feature of size established by basic dimensions.
Position tolerance does what?
Defines the allowable deviation of a feature of size from true position and May limit orientation deviation.
A position tolerance must what?
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
Flatness is defined as what?
A perfect plane.
Straightness is defined as what?
a perfect line element.
Flatness Tolerance is what?
A geometric tolerance that defines allowable flatness deviation on planar surface or derived median plane.
Straightness Tolerance is defined as what?
allowable straightness deviation on individual surface elements or on a derived median line.
