11 Profile. GD&T: Application and Interpretation© Goodheart-Willcox Co., Inc. Define line and...

11Profile

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.


• Identify profile tolerances as the means for specifying allowable variation for conical surface form, orientation, and location.

• Draw a composite profile tolerance specification.


Profile Specification

• Line profile• Surface profile• Same feature control frame format• Different symbols• No diameter symbol for the tolerance• Applied RFS


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


Line Profile Application


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


Surface Profile Application


Limits of Application

• Unless specified, applicable to entire surface• All around profile• All over profile• Defined limit


Profile Application across the Feature


Profile Application between Noted Limits


All Around Application

• Symbol is similar to welding all around• Only applies to the feature as seen in toleranced

view


All Over Application

• Applies to all features of a part• May apply additional tolerances


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


Achievable Levels of Control


Control of Form Only

• Other tolerances must establish location and orientation

• Profile tolerance must not contain datum feature reference


Control of Form, Orientation, Location

• Surface is located by basic dimensions• Datum references included


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


Coplanarity, Orientation, and Location (Cont.)


Profile Applied to Conical Surfaces


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


Composite Profile All Around


Profile and Position Tolerances Combined


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

11 Profile. GD&T: Application and Interpretation© Goodheart-Willcox Co., Inc. Define line and...

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