lecture 11- profile tolerancing

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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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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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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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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Surface Profile Application


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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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All Around Application

Symbol is similar to welding all around

Only applies to the feature as seen in toleranced

view


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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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Control of Form,Orientation, Location

Surface is located by basic dimensions

Datum references included


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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

lecture 11- profile tolerancing

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