F4:Circularity Validation
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Revision as of 21:08, 14 January 2026 by Admin (talk | contribs) (Created page with "{{Author Credit |author=Admin }} == Summary == F4 validates circularity against the ASME logic in the F4 Application and enforces feature-type, modifier, and pattern rules. == Validation rules == * Circularity is valid only for a sphere or a surface of revolution. * Circularity cannot reference datums. * Circularity cannot be applied to a pattern. * FOS linkage is not allowed for circularity in F4. * Prohibited modifiers: diameter, LMC, MMC, projected to...")
Summary
F4 validates circularity against the ASME logic in the F4 Application and enforces feature-type, modifier, and pattern rules.
Validation rules
- Circularity is valid only for a sphere or a surface of revolution.
- Circularity cannot reference datums.
- Circularity cannot be applied to a pattern.
- FOS linkage is not allowed for circularity in F4.
- Prohibited modifiers: diameter, LMC, MMC, projected tolerance zone, tangent plane, unequally disposed.
Warnings and errors
F4 behavior
- Invalid feature type
If the FCF is applied to anything other than a sphere or a surface of revolution, F4 flags non-compliance.
F4 behavior
- Pattern not allowed
Circularity applied to a pattern is rejected.
F4 behavior
- Datum references
Any datum reference in a circularity FCF is rejected.
F4 behavior
- FOS linkage not allowed
Circularity must not be linked to a feature of size in F4.
F4 behavior
- Prohibited modifiers
Diameter, LMC, MMC, projected tolerance zone, tangent plane, and unequally disposed are not allowed on circularity.
Examples
- Valid: circularity on a revolved surface with no datums.
- Invalid: circularity with a datum reference or applied to a pattern.