Lecture 11- Profile Tolerancing
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Transcript of Lecture 11- Profile Tolerancing
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7/16/2019 Lecture 11- Profile Tolerancing
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11Profile
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GD&T: Application and Interpretation Goodheart-Willcox Co., Inc.
Define line and surface profile tolerances. Apply profile tolerances to define allowable
variation within a limited zone on a feature or all
of a feature.
Apply profile tolerances to extend all around the
profile shown in a drawing view.
Complete profile tolerance specifications to
achieve any of the possible levels of control. Sketch the tolerance zone created by profile
tolerance specifications.
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Identify profile tolerances as the means forspecifying allowable variation for conical surface
form, orientation, and location.
Draw a composite profile tolerance specification.
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GD&T: Application and Interpretation Goodheart-Willcox Co., Inc.
Profile Specification
Line profile
Surface profile
Same feature control frame format
Different symbols No diameter symbol for the tolerance
Applied RFS
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GD&T: Application and Interpretation Goodheart-Willcox Co., Inc.
Line Profile
Control single line elements on a feature
Each element is independent of all others
Control is only parallel to the profile to which the
tolerance is applied
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GD&T: Application and Interpretation Goodheart-Willcox Co., Inc.
Line Profile Application
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Surface Profile
Control all elements on a feature
When applied to one surface on a feature of
size, the size tolerance also affects the surface
requirements Simplest level of control, controls form only
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GD&T: Application and Interpretation Goodheart-Willcox Co., Inc.
Surface Profile Application
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GD&T: Application and Interpretation Goodheart-Willcox Co., Inc.
Limits of Application
Unless specified, applicable to entire surface
All around profile
All over profile
Defined limit
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Profile Applicationacross the Feature
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Profile Applicationbetween Noted Limits
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GD&T: Application and Interpretation Goodheart-Willcox Co., Inc.
All Around Application
Symbol is similar to welding all around
Only applies to the feature as seen in toleranced
view
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GD&T: Application and Interpretation Goodheart-Willcox Co., Inc.
All Over Application
Applies to all features of a part
May apply additional tolerances
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Profile Directions
Bidirectional profile tolerance Centered on true profile
Unequally distributed profile tolerance
Unidirectional profile tolerance applied to morematerial
Unidirectional tolerance applied to less material
Unequal disposed tolerance applied to allow more or
less material
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Achievable Levels of Control
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Control of Form Only
Other tolerances must establish location andorientation
Profile tolerance must not contain datum feature
reference
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GD&T: Application and Interpretation Goodheart-Willcox Co., Inc.
Control of Form,Orientation, Location
Surface is located by basic dimensions
Datum references included
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GD&T: Application and Interpretation Goodheart-Willcox Co., Inc.
Coplanarity, Orientation,and Location
All contained in one tolerance
Profile tolerances control location, orientation,
and coplanarity if the features are:
Form defined by basic dimensions Location defined with a basic dimension
Datum references are shown
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Coplanarity, Orientation,and Location (Cont.)
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Profile Appliedto Conical Surfaces
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Composite Profile Tolerances
Form tolerances tighter than location ororientation tolerances
Datum references in first segment constrain
translational and rotational degrees of freedom Second segment constrains only rotational
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Composite Profile All Around
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Profile and PositionTolerances Combined
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Composite Profile forPattern of Features
Multiple features that form a single pattern
First segment: pattern-locating tolerance zone
framework
Second segment: defines feature-relatingtolerance zone framework