Latest revision as of 18:28, 15 January 2026

F4 Wiki

The public, stable reference for GD&T and how the F4 Application interprets it.

Each topic pairs standard GD&T guidance with F4 validation behavior so you can move from definition to decision quickly.

Quick links

Start here

GD&T Reference
Standard definitions, symbols, and usage guidance.

F4 Behavior
Rules, checks, and decisions used by the F4 validator.

Glossary and Examples
Short definitions and worked applications.

Browse by category

Form
Straightness, flatness, circularity, cylindricity.

Orientation
Parallelism, perpendicularity, angularity.

Location
Position, composite, MSS, concentricity, symmetry.

Profile
Line, surface, composite, MSS.

Runout
Circular and total runout.

Supporting rules Related guidance for modifiers and datum systems.

Featured pages

GDT:Straightness - basic line element form control.
GDT:Flatness - planar form control.
GDT:Position - primary location control for features of size.
GDT:Profile of a Surface - shape and location combined.
F4:Position Validation - how F4 checks position.

How to use this wiki

The public view shows approved revisions only.
Each GD&T page links to its matching F4 validation page.
Use the sidebar or search to find topics quickly.
When a rule needs interpretation, the F4 page calls out the decision and its impact.

Community

Community forum
Announcements, questions, feature requests, and showcases.

Messages
Direct messages between contributors.

@@ Line 2: / Line 2: @@
 = F4 Wiki =
-A trusted GD&T reference with F4 validation behavior, reviewed and published by moderators.
+{| class="f4-hero"
+| [[File:F4_Logo_White.svg|80px|frameless|link=Main_Page|alt=F4|class=f4-logo]]
+| '''The public, stable reference for GD&T and how the F4 Application interprets it.'''<br/>
+Each topic pairs standard GD&T guidance with F4 validation behavior so you can move from definition to decision quickly.
+|}
-This wiki is the public, stable reference for how GD&T concepts are defined and how the F4 Application interprets and validates them.
+== Quick links ==
-Every page links standard guidance to F4-specific behavior so engineers can move from definition to decision quickly.
+* [https://f4.dev/ F4 website]
+* [https://docs.f4.dev/ Documentation]
+* [https://download.f4.dev/ Downloads]
+== Start here ==
+{| class="f4-card-grid"
+|-
+| class="f4-card" |
+'''[[:Category:GDT Reference|GD&T Reference]]'''<br/>
+Standard definitions, symbols, and usage guidance.
+| class="f4-card" |
+'''[[:Category:F4 Behavior|F4 Behavior]]'''<br/>
+Rules, checks, and decisions used by the F4 validator.
+| class="f4-card" |
+'''[[:Category:Glossary|Glossary and Examples]]'''<br/>
+Short definitions and worked applications.
+|}
-== Quick start ==
+== Browse by category ==
-* [[Category:GDT Reference|GD&T Reference]] for standard definitions and examples.
+{| class="f4-card-grid"
-* [[Category:F4 Behavior|F4 Behavior]] for validation rules, warnings, and errors.
+|-
-* [[Category:Glossary|Glossary]] for short definitions.
+| class="f4-card" |
-* [[Category:Examples|Examples]] for worked applications.
+'''[[:Category:Form|Form]]'''<br/>
-* [[Forum:Start|Community forum]] for discussions and questions.
+Straightness, flatness, circularity, cylindricity.
+| class="f4-card" |
+'''[[:Category:Orientation|Orientation]]'''<br/>
+Parallelism, perpendicularity, angularity.
+|-
+| class="f4-card" |
+'''[[:Category:Location|Location]]'''<br/>
+Position, composite, MSS, concentricity, symmetry.
+| class="f4-card" |
+'''[[:Category:Profile|Profile]]'''<br/>
+Line, surface, composite, MSS.
+|-
+| class="f4-card" |
+'''[[:Category:Runout|Runout]]'''<br/>
+Circular and total runout.
+| class="f4-card" |
+'''Supporting rules'''
+Related guidance for modifiers and datum systems.
+* [[:Category:Modifiers|Modifiers]]
+* [[:Category:Datums|Datums]]
+|}
+== Featured pages ==
+* [[GDT:Straightness]] - basic line element form control.
+* [[GDT:Flatness]] - planar form control.
+* [[GDT:Position]] - primary location control for features of size.
+* [[GDT:Profile of a Surface]] - shape and location combined.
+* [[F4:Position Validation]] - how F4 checks position.
 == How to use this wiki ==
@@ Line 18: / Line 65: @@
 * Each GD&T page links to its matching F4 validation page.
 * Use the sidebar or search to find topics quickly.
-* When an item requires interpretation, the F4 page calls out the decision and how it affects compliance.
+* When a rule needs interpretation, the F4 page calls out the decision and its impact.
-== About F4 ==
-F4 is an engineering platform focused on GD&T interpretation and compliance checks.
-Use this wiki alongside the official docs and downloads.
-* [https://f4.dev/ F4 website]
-* [https://docs.f4.dev/ Documentation]
-* [https://download.f4.dev/ Downloads]
-== Featured pages ==
+== Community ==
-* [[GDT:Straightness]]
+{| class="f4-card-grid"
-* [[GDT:Flatness]]
+|-
-* [[GDT:Position]]
+| class="f4-card" |
-* [[GDT:Profile of a Surface]]
+'''[[Forum:Start|Community forum]]'''<br/>
-* [[F4:Position Validation]]
+Announcements, questions, feature requests, and showcases.
+| class="f4-card" |
+'''[[Special:UserBoard|Messages]]'''<br/>
+Direct messages between contributors.
+|}
 == Contribute ==
@@ Line 39: / Line 82: @@
 * [[F4_Wiki:License|License]]
 * [[Special:ApprovedRevs|Review queue]]
-* [[Special:UserBoard|Messages]]