GDT:Multi-Single Segment FCF
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| Symbol | Multi-Single Segment FCF |
|---|---|
| Type | Multi-Segment |
| Category | Multi-Segment |
| Standard | ASME Y14.5 |
| Author | Admin |
| Datums | Per segment as required by the tolerance type |
| Modifiers | Per segment; must follow the rules for each tolerance symbol |
| Tolerance zone | Multiple single-segment zones stacked in one feature control frame |
| Image | GDT-Multi-Single-Segment-FCF.svg |
| Common mistakes | Using composite rules instead of MSS; repeating identical segments or datum frames; missing basic dimensions for position/profile; mixing incompatible modifiers |
| Related | F4:Multi-Single Segment Validation |
Summary
Multi-single segment (MSS) feature control frames stack two or more single-segment tolerances to apply multiple requirements to the same feature or pattern.
Definition
An MSS FCF contains two or more single segments, each a separate requirement. Segments can reference different datum frames and may use different tolerance symbols. MSS is not the same as a composite FCF.
When to use it
Use MSS when a feature must satisfy multiple independent requirements, such as different functional datum frames or different tolerance symbols.
Examples
Example: Two MSS segments with different datum frames
An MSS frame applies two independent requirements with different datums to the same feature.
Example: MSS with mixed tolerance symbols
Two segments apply different symbols to the same feature when each requirement must be evaluated separately.
Common mistakes
- Treating MSS as a composite FCF.
- Repeating the same datum reference set across segments.
- Missing basic dimensions for position or profile requirements.
- Using modifiers that are not permitted for a given segment.