GDT:Cylindricity: Difference between revisions
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Created page with "{{Author Credit |author=Admin }} {{GDT Infobox |symbol=Cylindricity |type=Form |category=Form |standard=ASME Y14.5 |author=Admin |datums=None |modifiers=ST (statistical tolerance, where allowed) |tolerance_zone=Two coaxial cylinders separated by the tolerance value |image=<!-- TODO: add diagram file name --> |mistakes=Adding datum references; applying cylindricity to a pattern; using prohibited modifiers |related=F4:Cylindricity Validatio..." |
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|modifiers=ST (statistical tolerance, where allowed) | |modifiers=ST (statistical tolerance, where allowed) | ||
|tolerance_zone=Two coaxial cylinders separated by the tolerance value | |tolerance_zone=Two coaxial cylinders separated by the tolerance value | ||
|image= | |image=GDT-Cylindricity.svg | ||
|mistakes=Adding datum references; applying cylindricity to a pattern; using prohibited modifiers | |mistakes=Adding datum references; applying cylindricity to a pattern; using prohibited modifiers | ||
|related=[[F4:Cylindricity Validation]] | |related=[[F4:Cylindricity Validation]] | ||
Latest revision as of 19:27, 15 January 2026
| Symbol | Cylindricity |
|---|---|
| Type | Form |
| Category | Form |
| Standard | ASME Y14.5 |
| Author | Admin |
| Datums | None |
| Modifiers | ST (statistical tolerance, where allowed) |
| Tolerance zone | Two coaxial cylinders separated by the tolerance value |
| Image | GDT-Cylindricity.svg |
| Common mistakes | Adding datum references; applying cylindricity to a pattern; using prohibited modifiers |
| Related | F4:Cylindricity Validation |
Summary
Cylindricity controls the complete form of a cylindrical surface. It combines roundness and straightness along the entire length.
Definition
The tolerance zone is the region between two coaxial cylinders separated by the tolerance value. The entire surface must fall within this zone.
When to use it
Use cylindricity when you need a shaft or bore to be uniformly cylindrical along its full length without using datums.
Examples
Example: Cylindricity on a shaft
Cylindricity applied to a shaft surface to control full-length form.
Common mistakes
- Adding datum references to a cylindricity FCF.
- Applying cylindricity to a pattern.
- Using modifiers other than ST where allowed.