GDT:Position Multi-Single Segment FCF: Difference between revisions
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Created page with "{{Author Credit |author=Admin }} {{GDT Infobox |symbol=Position Multi-Single Segment FCF |type=Location |category=Multi-Segment |standard=ASME Y14.5 |author=Admin |datums=Required for planar FOS; segments should not repeat the same datum set |modifiers=Diameter required for cylindrical FOS; tangent and unequal are not allowed; ST where allowed |tolerance_zone=Multiple position segments, each defining its own zone |image=<!-- TODO: add diagr..." |
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|modifiers=Diameter required for cylindrical FOS; tangent and unequal are not allowed; ST where allowed | |modifiers=Diameter required for cylindrical FOS; tangent and unequal are not allowed; ST where allowed | ||
|tolerance_zone=Multiple position segments, each defining its own zone | |tolerance_zone=Multiple position segments, each defining its own zone | ||
|image= | |image=GDT-Position-MSS-FCF.svg | ||
|mistakes=Missing basic dimensions; missing datums for planar FOS; missing diameter for cylindrical FOS; repeating the same datum set | |mistakes=Missing basic dimensions; missing datums for planar FOS; missing diameter for cylindrical FOS; repeating the same datum set | ||
|related=[[F4:Position MSS Validation]] | |related=[[F4:Position MSS Validation]] | ||
Latest revision as of 19:30, 15 January 2026
| Symbol | Position Multi-Single Segment FCF |
|---|---|
| Type | Location |
| Category | Multi-Segment |
| Standard | ASME Y14.5 |
| Author | Admin |
| Datums | Required for planar FOS; segments should not repeat the same datum set |
| Modifiers | Diameter required for cylindrical FOS; tangent and unequal are not allowed; ST where allowed |
| Tolerance zone | Multiple position segments, each defining its own zone |
| Image | GDT-Position-MSS-FCF.svg |
| Common mistakes | Missing basic dimensions; missing datums for planar FOS; missing diameter for cylindrical FOS; repeating the same datum set |
| Related | F4:Position MSS Validation |
Summary
Position MSS (multi-single segment) feature control frames apply multiple position requirements to the same feature or pattern.
Definition
An MSS FCF contains two or more position segments. Each segment is a separate requirement and can reference different datum frames. Basic dimensions locate the true position for each requirement.
When to use it
Use position MSS when a feature needs to satisfy multiple position requirements, such as different functional datum frames.
Examples
Example: Position MSS on a hole pattern
Two position segments with different datum references controlling the same pattern.
Common mistakes
- Missing basic dimensions that locate the true position.
- Missing datum references for planar features of size.
- Omitting the diameter modifier for cylindrical features of size.
- Repeating the same datum reference set across segments.