GDT:Profile of a Line
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Revision as of 21:28, 14 January 2026 by Admin (talk | contribs) (Created page with "{{Author Credit |author=Admin }} {{GDT Infobox |symbol=Profile of a Line |type=Profile |category=Profile |standard=ASME Y14.5 |author=Admin |datums=Optional, based on how the true profile is located |modifiers=Dynamic profile, non-uniform, tangent, unequal, free state, ST where allowed |tolerance_zone=Two offset lines about the true profile |image=<!-- TODO: add diagram file name --> |mistakes=Missing basic/toleranced location; using prohib...")
| Symbol | Profile of a Line |
|---|---|
| Type | Profile |
| Category | Profile |
| Standard | ASME Y14.5 |
| Author | Admin |
| Datums | Optional, based on how the true profile is located |
| Modifiers | Dynamic profile, non-uniform, tangent, unequal, free state, ST where allowed |
| Tolerance zone | Two offset lines about the true profile |
| Image | |
| Common mistakes | Missing basic/toleranced location; using prohibited modifiers; misusing datum surfaces |
| Related | F4:Profile of a Line Validation |
Summary
Profile of a line controls the form of a cross-section or line element relative to the true profile.
Definition
The tolerance zone is bounded by two lines equally disposed about the true profile unless otherwise specified. The measured line must fall within this zone.
When to use it
Use profile of a line to control a specific section of a surface or a 2D profile where form and location must be controlled together.
Examples
Example: Line profile with datum references
Profile of a line applied to a cross-section located by basic dimensions and datums.
Common mistakes
- Not locating the true profile with basic or toleranced dimensions.
- Applying the profile to a datum surface in an ambiguous way.
- Using prohibited modifiers.