# What is profile of line in GD?

## What is profile of line in GD?

Profile of a line describes a tolerance zone around any line in any feature, usually of a curved shape. Profile of a line is a 2-Dimensional tolerance range that can be applied to any linear tolerance. The profile of a line callout can also be set with an all-around leader or given a specific range (see example).

## What is Profile GDT?

Profile of a surface describes a 3-Dimensional tolerance zone around a surface, usually which is an advanced curve or shape. Profile controls all the points along the surface within a tolerance range that directly mimics the designed profile.

## What is difference between profile of line and profile of surface?

In other words, while profile of a line looks only at a specific cross section, profile of a surface looks at how measurements vary from one cross section to the next.

## Does profile of a line need a datum?

Profile can control, form, location, orientation, and size or any subset of these. Profile can be used with or without datum references and with or without basic dimensions.

## What does U mean in GD?

unequally disposed profile
“U” stands for “unequally disposed profile.” This specifies the range of run-out of the offset amount from the tolerance zone (tolerance zone limit) in terms of the profile tolerance of a plane. “UZ” is used for annotation according to the ISO standards.

## How does a profile tolerance work?

In GD, profile tolerance defines a uniform boundary around a surface within which the elements of the surface must lie. Profile is a complex tolerance that simultaneously controls a feature’s form, size, orientation, and sometimes location. The top figure shows the profile tolerance applied to a curved surface.

## What is profile measurement?

Profile measurement systems measure and record the profile of a target by tracing the surface of the target using a stylus. Some instruments can even be used as surface roughness meters. These instruments are ideal for measuring minute shapes such as screw threads and thin films in the order of micrometers.

## What is profile of a line?

Definition of Profile of a Line In GD the Profile of a Line symbol is used to establish a tolerane zone around a line in a feature. It might be used to specify the 2-dimensional tolerance for a line that is the cross section of a surface, for example. Instead, it is used to define tolerances for complex surfaces.

## What is the difference between flatness and profile?

RE: Flatness vs. Profile. Flatness is to a single surface or plane while profile of a surface CAN apply to multiple surfaces on the same plane.