Features and Operations > Validation > GD&T Checker and Relationship Wizard

The GD&T Checker and Relationship Wizard (Relationship) is a tree dialog that shows relationships of features and points used in Moves, Tolerances/GD&T and Measures (MTMs). This dialog also shows GD&T errors and warnings, or if features are used or not used in GD&T/3DCS Tolerance but are used in other MTMs. The GD&T Checker/Relationship Wizard can be found under the Validation menu.

Commands:

Hide Toleranced Features: Points and Features that are used in GD&T or 3DCS Tolerances will be hidden.

Hide Unused Features: Hides Points and Features that are not used in other GD&T or 3DCS Tolerances.

Hide MTMs (Moves, Tolerances, GD&T and Measures): Hides all MTMs from in the model list.

Summary: Creates a text file and reports the Features and GD&T that have Errors and Warnings.

Refresh: Any Model changes gets updated quickly in the relationship tree on clicking the Refresh button.

Syntax, Error Messages, and Deviation Validation

Below is a list of messages validating the GD&T inputs. The messages can be seen within the GD&T Checker and Relationship Wizard is open.

3DCS will deviate these tolerances in this order for the Analysis.

1.Size

2.Form

3.Orientation

4.Location

5.Pattern (Composite Position and Composite Profile - ASME Standard only)

6.Dimensions

Check GD&T Syntax

Based on GD&T-Standard: (Select Summary from any of the GD&T dialogs to see codes mentioned below).

The table below shows what 3DCS will validate in the GD&T. For example: selecting a cylindrical feature in a Surface Profile tolerance may display an zone-shape warning.

Feature type checking: Specific for geometric tolerances and size tolerances. If a circular and a planar feature exist in the field, a warning could be displayed if the tolerance is (Circular, Planar, Size)

Zone-shape checking; (No Zone Shape, Zone-Shape always, Cylindrical, Spherical)

Material condition checking; (No MMC, MMC for Size)

DRF existing checking; (No DRF, DRF required, Optional DRF)

GD&T Syntax validation
GD&T type		Feature Type validation	Can use MMC/LMC Modifier	DRF validation
	Datum	No Syntax Validation
	Feature of Size	2 Parallel Planes or Cylinder	No	N/A
	Position	2 Parallel Planes or Cylinder	Yes	DRF Required
	Profile of a Surface	Planar Surfaces, irregular surfaces	No	Not Required
	Flatness	Planar surface	Yes	No DRF
	Perpendicularity	Lines, Planar, or Cylinder	Yes, if Feature of Size	DRF Required
	Angularity	Lines, Planar, or Cylinder	Yes, if Feature of Size	DRF Required
	Parallelism	Lines, Planar, or Cylinder	Yes, if Feature of Size	DRF Required
	Straightness	Lines, Plane, Cylinder	Yes, if Feature of Size	No DRF
	Total Runout	Circles	No	DRF Required
	Runout	Cylinder	No	DRF Required
	Circularity	Circle	No	No DRF
	Cylindricity	Cylinder	No	No DRF
	Concentricity	Cylinder	No	DRF Required
	Symmetry	2 Parallel Planes	No	DRF Required
	Profile of a Line	Lines, Axis, irregular lines	No	Not Required
	Dimensioning Location	2 Parallel Planes	No	N/A
	Angle Size	2 Lines	No	N/A
	Torus - Minor Diameter	Cylinder	No	N/A

GD&T Feature Association and Deviation check

Check GD&T Association:

•All size features with Position GD&T should be associated with a Size GD&T

•Each datum should be used somewhere (warning if not); Datum not referenced.

Check GD&T Feature List:

•Check Feature List: (1) not empty; (2) no invalid feature; (3) no mix of plane and size feature except size dimensioning;

General GD&T Deviation:

•This section describes the general guidelines in deviating GD&T.

General GD&T Deviation
GD&T type		Feature Type validation	Deviation
	Position	Cylindrical, Spherical	Deviates the axis with two random settings and applied on Centers; Simulates the deviation as Location
	Position	Slot, Tab	Deviates the plane with one random setting and applied on Centers; Simulates the deviation as Location
	Position	Plane; Planar (ISO/JIS)	Deviates a planar surface with one random setting; Simulates the deviation as Location
	Profile of a Surface	Planar, Conical Surfaces	Deviates the plane with one random setting and applied on Centers; Simulates the deviation as Location
	Profile of Line	Line, Edge, Curve	Deviates the line with one random setting and applied on Surface; Simulates the deviation as Location, normal the edge (Set the direction in Edge Direction dialog).
	Symmetry	Center Plane	Deviates a planar surface with one random setting; Simulates the deviation as Location
	Concentricity	Cylindrical, Spherical	Deviates an axis with two random settings and applied on Centers; Simulates deviation as Location
	Circular Runout	Cylindrical	Deviates cylindrical features center or axis, shown as sections (points), as Position variation for true cylinder; Cone-type features deviate the surface of the cone as Form
	Total Runout	Cylindrical	Deviates the cylindrical feature type as position (location) with one random setting
	Angularity	Cylindrical, Spherical	Deviate an axis with two random settings and applied to the Center; Simulates the deviation as Orientation.
	Angularity	Center Plane or Planar	Deviate a plane or surface with one random value, tilts plane from the Center; Simulates the deviation as Orientation.
	Parallelism	Cylindrical, Spherical	Deviates an axis with one random setting and applied on Centers; Simulates the deviation as Location
	Parallelism	Center Plane or Planar	Deviates the plane with one random setting and applied on Centers; Simulates the deviation as Location
	Perpendicularity	Cylindrical, Spherical	Deviates an axis with two random settings and applied to the Center; Simulates the deviation as Orientation.
	Perpendicularity	Center Plane or Planar	Deviate a plane or surface with one random value, tilts plane from the Center; Simulates the deviation as Orientation.
	Straightness	Cylindrical, Spherical	Deviate the axis with two random settings, applied to the Center; Simulates the deviation as Form.
	Straightness	Center Plane or Planar	Deviate a plane or surface with one random value; Simulates deviation as Form.
	Flatness	Planar	Deviates a plane or surface with one random value; Simulates deviation as Form.
	Circularity (Roundness)	Cylinder, Sphere	Deviates the edge (sections) with one random value; Simulates deviation as Form (Size).
	Cylindricity	Cylinder	Deviates the edge (sections) with one random value; Simulates deviation as Form.

Notes:

While editing the GD&T or GD&T Measure dialogs, if any GD&T or GD&T Measure has the same name, while the dialog is open and the user either select OK or Apply, a rename dialog will open. The user will need to define a new name.

GD&T Checker and Relationship Wizard