Revision as of 22:21, 14 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.

<a href="https://f4.dev/" style="display: inline-block; padding: 6px 10px; border-radius: 8px; background: var(--f4-bg-surface); border: 1px solid var(--f4-border); color: var(--f4-text); text-decoration: none;">F4 website</a> <a href="https://docs.f4.dev/" style="display: inline-block; padding: 6px 10px; border-radius: 8px; background: var(--f4-bg-surface); border: 1px solid var(--f4-border); color: var(--f4-text); text-decoration: none;">Documentation</a> <a href="https://download.f4.dev/" style="display: inline-block; padding: 6px 10px; border-radius: 8px; background: var(--f4-bg-surface); border: 1px solid var(--f4-border); color: var(--f4-text); text-decoration: none;">Downloads</a>

GD&T Reference

Standard definitions, symbols, and usage guidance.

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F4 Behavior

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

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Glossary and Examples

Short definitions and worked applications.

Browse glossary and examples

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Browse by category

Form

Straightness, flatness, circularity, cylindricity.

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Orientation

Parallelism, perpendicularity, angularity.

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Location

Position, composite, MSS, concentricity, symmetry.

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Profile

Line, surface, composite, MSS.

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Runout

Circular and total runout.

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Supporting rules

<a href="/index.php/Category:Modifiers" style="color: var(--f4-accent); text-decoration: none;">Modifiers</a> and <a href="/index.php/Category:Datums" style="color: var(--f4-accent); text-decoration: none;">Datums</a>.

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.

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Messages

Direct messages between contributors.

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@@ Line 3: / Line 3: @@
 <div style="background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 12px; padding: 1.2em; margin-bottom: 1.2em;">
-''The public, stable reference for GD&T and how the F4 Application interprets it.''<br>
+<div style="display: flex; gap: 16px; align-items: center; flex-wrap: wrap;">
-Each topic pairs standard GD&T guidance with F4 validation behavior so you can move from definition to decision quickly.
+<div style="flex: 0 0 auto;">
+<img src="/resources/assets/logo-white.svg" alt="F4" style="height: 56px; width: auto;">
+</div>
+<div style="flex: 1 1 320px;">
+<div style="font-size: 1.2em; font-weight: 600;">The public, stable reference for GD&T and how the F4 Application interprets it.</div>
+<div style="margin-top: 0.4em;">Each topic pairs standard GD&T guidance with F4 validation behavior so you can move from definition to decision quickly.</div>
+</div>
+</div>
+<div style="margin-top: 0.9em; display: flex; gap: 8px; flex-wrap: wrap;">
+<a href="https://f4.dev/" style="display: inline-block; padding: 6px 10px; border-radius: 8px; background: var(--f4-bg-surface); border: 1px solid var(--f4-border); color: var(--f4-text); text-decoration: none;">F4 website</a>
+<a href="https://docs.f4.dev/" style="display: inline-block; padding: 6px 10px; border-radius: 8px; background: var(--f4-bg-surface); border: 1px solid var(--f4-border); color: var(--f4-text); text-decoration: none;">Documentation</a>
+<a href="https://download.f4.dev/" style="display: inline-block; padding: 6px 10px; border-radius: 8px; background: var(--f4-bg-surface); border: 1px solid var(--f4-border); color: var(--f4-text); text-decoration: none;">Downloads</a>
+</div>
 </div>
@@ Line 10: / Line 22: @@
 |-
 | style="vertical-align: top; width: 33%;" |
-<div style="background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em;">
+<a href="/index.php/Category:GDT_Reference" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);">
-'''GD&T Reference'''<br>
+<div style="font-weight: 600;">GD&T Reference</div>
-Standard definitions, symbols, and usage guidance.
+<div style="margin-top: 0.4em;">Standard definitions, symbols, and usage guidance.</div>
-* [[Category:GDT Reference|Browse GD&T Reference]]
+</a>
-</div>
 | style="vertical-align: top; width: 33%;" |
-<div style="background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em;">
+<a href="/index.php/Category:F4_Behavior" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);">
-'''F4 Behavior'''<br>
+<div style="font-weight: 600;">F4 Behavior</div>
-Rules, checks, and decisions used by the F4 validator.
+<div style="margin-top: 0.4em;">Rules, checks, and decisions used by the F4 validator.</div>
-* [[Category:F4 Behavior|Browse F4 Behavior]]
+</a>
-</div>
 | style="vertical-align: top; width: 33%;" |
+<a href="/index.php/Category:Glossary" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);">
+<div style="font-weight: 600;">Glossary and Examples</div>
+<div style="margin-top: 0.4em;">Short definitions and worked applications.</div>
+<div style="margin-top: 0.6em; color: var(--f4-accent);">Browse glossary and examples</div>
+</a>
+|}
+== Browse by category ==
+{| style="width: 100%; border-collapse: separate; border-spacing: 12px;"
+|-
+| style="vertical-align: top; width: 50%;" |
+<a href="/index.php/Category:Form" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);">
+<div style="font-weight: 600;">Form</div>
+<div style="margin-top: 0.4em;">Straightness, flatness, circularity, cylindricity.</div>
+</a>
+| style="vertical-align: top; width: 50%;" |
+<a href="/index.php/Category:Orientation" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);">
+<div style="font-weight: 600;">Orientation</div>
+<div style="margin-top: 0.4em;">Parallelism, perpendicularity, angularity.</div>
+</a>
+|-
+| style="vertical-align: top; width: 50%;" |
+<a href="/index.php/Category:Location" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);">
+<div style="font-weight: 600;">Location</div>
+<div style="margin-top: 0.4em;">Position, composite, MSS, concentricity, symmetry.</div>
+</a>
+| style="vertical-align: top; width: 50%;" |
+<a href="/index.php/Category:Profile" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);">
+<div style="font-weight: 600;">Profile</div>
+<div style="margin-top: 0.4em;">Line, surface, composite, MSS.</div>
+</a>
+|-
+| style="vertical-align: top; width: 50%;" |
+<a href="/index.php/Category:Runout" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);">
+<div style="font-weight: 600;">Runout</div>
+<div style="margin-top: 0.4em;">Circular and total runout.</div>
+</a>
+| style="vertical-align: top; width: 50%;" |
 <div style="background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em;">
-'''Glossary and Examples'''<br>
+<div style="font-weight: 600;">Supporting rules</div>
-Short definitions and worked applications.
+<div style="margin-top: 0.4em;"><a href="/index.php/Category:Modifiers" style="color: var(--f4-accent); text-decoration: none;">Modifiers</a> and <a href="/index.php/Category:Datums" style="color: var(--f4-accent); text-decoration: none;">Datums</a>.</div>
-* [[Category:Glossary|Glossary]]
-* [[Category:Examples|Examples]]
 </div>
 |}
-== Browse by category ==
-* [[Category:Form|Form]] - straightness, flatness, circularity, cylindricity.
-* [[Category:Orientation|Orientation]] - parallelism, perpendicularity, angularity.
-* [[Category:Location|Location]] - position, composite, MSS, concentricity, symmetry.
-* [[Category:Profile|Profile]] - line, surface, composite, MSS.
-* [[Category:Runout|Runout]] - circular and total runout.
-* [[Category:Modifiers|Modifiers]] and [[Category:Datums|Datums]] for supporting rules.
 == Featured pages ==
@@ Line 52: / Line 90: @@
 == Community ==
-* [[Forum:Start|Community forum]]
+{| style="width: 100%; border-collapse: separate; border-spacing: 12px;"
-* [[Special:UserBoard|Messages]]
+|-
+| style="vertical-align: top; width: 50%;" |
-== About F4 ==
+<a href="/index.php/Forum:Start" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);">
-F4 is an engineering platform focused on GD&T interpretation and compliance checks.
+<div style="font-weight: 600;">Community forum</div>
-Use this wiki alongside the official docs and downloads.
+<div style="margin-top: 0.4em;">Announcements, questions, feature requests, and showcases.</div>
+</a>
-* [https://f4.dev/ F4 website]
+| style="vertical-align: top; width: 50%;" |
-* [https://docs.f4.dev/ Documentation]
+<a href="/index.php/Special:UserBoard" style="display: block; background: var(--f4-bg-panel); border: 1px solid var(--f4-border); border-radius: 10px; padding: 0.9em; text-decoration: none; color: var(--f4-text);">
-* [https://download.f4.dev/ Downloads]
+<div style="font-weight: 600;">Messages</div>
+<div style="margin-top: 0.4em;">Direct messages between contributors.</div>
+</a>
+|}
 == Contribute ==