F4:Angularity Validation
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Revision as of 21:15, 14 January 2026 by Admin (talk | contribs) (Created page with "{{Author Credit |author=Admin }} == Summary == F4 validates angularity against the ASME logic in the F4 Application and enforces datum, feature-type, modifier, and pattern rules. == Validation rules == * A primary datum reference is required. * A basic angle is required. * Angularity is valid only for a planar surface, a planar feature of size, or a cylindrical feature of size. * Angularity cannot be applied to a pattern. * Unequally disposed is not allo...")
Summary
F4 validates angularity against the ASME logic in the F4 Application and enforces datum, feature-type, modifier, and pattern rules.
Validation rules
- A primary datum reference is required.
- A basic angle is required.
- Angularity is valid only for a planar surface, a planar feature of size, or a cylindrical feature of size.
- Angularity cannot be applied to a pattern.
- Unequally disposed is not allowed.
- Planar surface: diameter, LMC, MMC, and projected tolerance zone are not allowed.
- Planar FOS: diameter, projected tolerance zone, and tangent plane are not allowed.
- Cylindrical FOS: diameter is required; tangent plane is not allowed.
- If a linked size dimension exists, F4 compares the FCF tolerance to the size tolerance.
- If no size dimension is linked, F4 skips the size tolerance comparison.
Warnings and errors
F4 behavior
- Missing datum
Angularity requires a primary datum reference; missing datums are rejected.
F4 behavior
- Missing basic angle
Angularity requires a basic angle; missing basic angles are rejected.
F4 behavior
- Invalid feature type
If the FCF is applied to anything other than a planar surface, planar FOS, or cylindrical FOS, F4 flags non-compliance.
F4 behavior
- Pattern not allowed
Angularity applied to a pattern is rejected.
F4 behavior
- Missing diameter
Cylindrical feature of size angularity must include the diameter modifier.
F4 behavior
- Prohibited modifiers
Use the modifier rules for planar surfaces, planar FOS, and cylindrical FOS; prohibited modifiers are rejected.
Examples
- Valid: planar surface angularity with a basic angle and datum A.
- Valid: cylindrical FOS angularity with the diameter modifier.
- Invalid: missing datum or missing basic angle.