lecture 11- profile tolerancing
DESCRIPTION
Geometric Dimensioning & Tolerancing - Profile TolerancingTRANSCRIPT
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11Profile
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• 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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GD&T: Application and Interpretation © Goodheart-Willcox Co., Inc.
• Identify profile tolerances as the means for specifying 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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GD&T: Application and Interpretation © Goodheart-Willcox Co., Inc.
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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GD&T: Application and Interpretation © Goodheart-Willcox Co., Inc.
Profile Application across the Feature
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GD&T: Application and Interpretation © Goodheart-Willcox Co., Inc.
Profile Application between 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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GD&T: Application and Interpretation © Goodheart-Willcox Co., Inc.
Profile Directions
• Bidirectional profile tolerance– Centered on true profile
• Unequally distributed profile tolerance– Unidirectional profile tolerance applied to more
material– Unidirectional tolerance applied to less material– Unequal disposed tolerance applied to allow more or
less material
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GD&T: Application and Interpretation © Goodheart-Willcox Co., Inc.
Achievable Levels of Control
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GD&T: Application and Interpretation © Goodheart-Willcox Co., Inc.
Control of Form Only
• Other tolerances must establish location and orientation
• 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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GD&T: Application and Interpretation © Goodheart-Willcox Co., Inc.
Coplanarity, Orientation, and Location (Cont.)
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GD&T: Application and Interpretation © Goodheart-Willcox Co., Inc.
Profile Applied to Conical Surfaces
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GD&T: Application and Interpretation © Goodheart-Willcox Co., Inc.
Composite Profile Tolerances
• Form tolerances tighter than location or orientation tolerances
• Datum references in first segment constrain translational and rotational degrees of freedom
• Second segment constrains only rotational
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GD&T: Application and Interpretation © Goodheart-Willcox Co., Inc.
Composite Profile All Around
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GD&T: Application and Interpretation © Goodheart-Willcox Co., Inc.
Profile and Position Tolerances Combined
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GD&T: Application and Interpretation © Goodheart-Willcox Co., Inc.
Composite Profile for Pattern of Features
• Multiple features that form a single pattern• First segment: pattern-locating tolerance zone
framework• Second segment: defines feature-relating
tolerance zone framework