1. 10
Runout

2. Describe the two types of runout tolerances.
Complete an interpretation drawing showing how each of the runout tolerances is measured.
Apply both types of runout tolerances on circular features and face surfaces.
Specify runout tolerances using multiple (compound) datum feature references.
Limit the area of application for a runout tolerance.
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3. Runout Surface variation relative to axis of rotation
Tolerances define amount of variation permitted
Circular and total
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4. Circular Runout
Single element measured by dial indicator in a fixed position while part rotates
Each measurement of multiple elements evaluated separately
Largest reading is the circular runout for the part
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5. Feature Control Frame
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6. Multiple Datum Features
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7. Primary and Secondary
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8. Circular Runout Applications
Cylinders
Cones
Spherical surfaces
Flat surfaces
Any surface with circular cross section centered on an axis
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9. Circular Runout—Cylinder
Multiple, but separate readings per feature
Surface control relative to axis of rotation
May be internal, such as holes
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10. Circular Runout—Conical Surface
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11. Circular Runout— Spherical Surface
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12. Circular Runout—Flat Surface
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13. Datum Axis
All runout tolerances must include at least one datum feature reference to establish axis
Datum feature may be entire surface or datum targets
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14. Multiple Datum Features
Also known as compound datum features
Two features establish one datum
Identified by two letters separated by a hyphen
Functional features are preferred
Coaxial holes may be used
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15. Limited Tolerance Zone Application
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16. Primary Axis, Secondary Plane
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17. Total Runout All elements on surface evaluated together
Variations measured relative to axis
Symbol is double arrows
Diameter symbol never used
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18. Total Runout—Cylinder
Total of all variation per feature
Surface control relative to axis of rotation
May be internal, such as holes
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19. Total Runout—Face Surfaces
Applied on extension lines
Connected with leader
Dial indicator moves perpendicular to axis
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20. Combined Effects of Size and Runout
Runout may be larger than size tolerance
Size tolerance may be larger than runout
Runout may occur on perfect form feature
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21. Multiple datum features
Circular runout
Surface variation measured relative to an axis of rotation at a circular cross section.
Multiple datum features
Two or more datum features that act together to establish a single datum plane or axis. Commonly called a compound datum feature.
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22. Runout
Variation of a surface relative to an axis of rotation.
Total runout
The amount of variation measured across an entire surface when the part is rotated on an axis of rotation.
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