F4:Position Validation: Difference between revisions

Latest revision as of 21:16, 14 January 2026

Author: Admin

Summary

F4 validates position against the ASME logic in the F4 Application and enforces feature-type, datum, modifier, and basic-dimension rules.

Validation rules

Position requires a feature of size.
Position is valid only for a planar feature of size or a cylindrical feature of size.
Basic dimensions must be used to establish true position.
Tangent plane and unequally disposed are not allowed.
Planar FOS: diameter and projected tolerance zone are not allowed.
Cylindrical FOS: diameter is required.
A datum reference is required for planar FOS; cylindrical FOS can be allowed without a datum.

Warnings and errors

F4 behavior

Invalid feature type

If the FCF is applied to anything other than a planar FOS or cylindrical FOS, F4 flags non-compliance.

F4 behavior

Missing basic dimensions

Position requires basic dimensions to establish true position; missing basic dimensions are rejected.

F4 behavior

Missing datum

Planar feature of size position requires at least one datum reference.

F4 behavior

Missing diameter

Cylindrical feature of size position must include the diameter modifier.

F4 behavior

Prohibited modifiers

Tangent plane, unequally disposed, and other prohibited modifiers are rejected.

Examples

Valid: planar FOS position with basic dimensions and a datum reference.
Valid: cylindrical FOS position with the diameter modifier.
Invalid: missing basic dimensions or missing datum on planar FOS.

Related pages

@@ Line 4: / Line 4: @@
 == Summary ==
-Short description of how F4 validates this feature.
+F4 validates position against the ASME logic in the F4 Application and enforces feature-type, datum, modifier, and basic-dimension rules.
 == Validation rules ==
-* Rule 1
+* Position requires a feature of size.
-* Rule 2
+* Position is valid only for a planar feature of size or a cylindrical feature of size.
+* Basic dimensions must be used to establish true position.
+* Tangent plane and unequally disposed are not allowed.
+* Planar FOS: diameter and projected tolerance zone are not allowed.
+* Cylindrical FOS: diameter is required.
+* A datum reference is required for planar FOS; cylindrical FOS can be allowed without a datum.
-== Errors and warnings ==
+== Warnings and errors ==
 {{F4 Behavior
-|type=warning
+|type=error
-|title=Datum order
+|title=Invalid feature type
-|body=F4 enforces datum order in composite frames.
+|body=If the FCF is applied to anything other than a planar FOS or cylindrical FOS, F4 flags non-compliance.
+}}
+{{F4 Behavior
+|type=error
+|title=Missing basic dimensions
+|body=Position requires basic dimensions to establish true position; missing basic dimensions are rejected.
+}}
+{{F4 Behavior
+|type=error
+|title=Missing datum
+|body=Planar feature of size position requires at least one datum reference.
+}}
+{{F4 Behavior
+|type=error
+|title=Missing diameter
+|body=Cylindrical feature of size position must include the diameter modifier.
+}}
+{{F4 Behavior
+|type=error
+|title=Prohibited modifiers
+|body=Tangent plane, unequally disposed, and other prohibited modifiers are rejected.
 }}
 == Examples ==
-Describe example behaviors and outputs.
+* Valid: planar FOS position with basic dimensions and a datum reference.
+* Valid: cylindrical FOS position with the diameter modifier.
+* Invalid: missing basic dimensions or missing datum on planar FOS.
-== Related ==
+== Related pages ==
 * [[GDT:Position]]
+* [[F4:Compliance Logic]]
 [[Category:F4 Behavior]]
-[[Category:Location]]