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

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.

GD&T Validation Messages and Solutions Also validate GD&T using the GD&T Checker
Tolerance Type	Status	Message	Solution
All GD&T	Error	Cannot find feature by ID=0	A feature or point may have been deleted. Check the dialog and remove the line that displays "No Selection".
All GD&T	Error	Name with '#' or "=", which will corrupt CSV files.	Edit the name of the MTM and GD&T, remove '#' or "=" from the name or the description.

Auto Refinement	Error	Point detected in feature list - AutoRefine will not be applied to any features in the list.	Uncheck the Auto Refinement option in the dialog, or create a separate GD&T for Points.

Datum Reference Frame (DRF)	Error	Primary Plane is Parallel to Secondary Plane In DRF	The Secondary points create a plane parallel to the Primary feature. (65630) Users will need to change the Secondary points direction to establish a better Datum Reference Frame.
	Error	Invalid DRF	The DRF has either been deleted or changed. Double-click the line in the Run Log or Validation window to edit or delete the DRF.
	Warning	Datum not referenced.	The datum is not applied in a Datum Reference Frame. The Datum may be not used in a Geometric Tolerance or defined a DRF. Create a new DRF with the datum feature.
	Warning	Ignore Different DRF on the same feature.	Warning only - No solution. (Ref. 67146) - The second DRF on the same feature will be ignored for the analysis.

Flatness	Error	Invalid material condition	Material condition was applied to the tolerance. Remove the Material Condition application from the tolerance. (CAD Extraction)

Form Tolerances (Flatness, Straightness, Circularity, Profile - No DRF).	Nominal Build (Run Log)	Multi-Form GD&Ts applied on the same feature.	Delete or deactivate one of the Form tolerances. Only the largest variation will be applied.

Orientation GD&T	Error	Contain non-Planar features in Orientation GTOL. (May need a direction).	The GD&T defined is a cylindrical feature but isn't defined without a diametrical zone. 3DCS will require a direction. Please add a direction in the GD&T Options tab.
Orientation GD&T	Dialog	Orientation GD&T applied to a single point. No variation will occur.	Not a valid use of orientation GD&T. Apply to a surface, planar or feature of size. (71598)

Geometric Tolerances	Error	Invalid Range (+/-X.X) (Size) Should be > (greater than) Range (+/-X.X) in GD&T (Parallelism, Angularity, Position).	Create Feature Slot/Tab and select the Slot/Tab in the tolerances instead of the surface. Change the range of geometric tolerance (Position, Parallelism, Angularity) to be smaller than the Size tolerance total range.
	Warning	If Orientation == Location, Message: Warning: Orientation Zone is equal to Location Zone. Entire Zone will be applied as Orientation. If Form == Orientation, Message: Warning: Form Zone is equal to Orientation Zone. Entire Zone will be applied as Form. If Form == Location, Message: Warning: Form Zone is equal to Location Zone. Entire Zone will be applied as Form. If Form == Orientation == Location, Message: Warning: Form Zone is equal to Orientation Zone & Location Zone. Entire Zone will be applied as Form.	Reduce the Form and/or Orientation tolerances to allow for Location, Orientation and Form tolerances to apply each type of variation to the model. (68239)
		Orientation > Location, Message: Orientation Zone larger than Location Zone, please correct. Form > Orientation, Message: Form Zone larger than Orientation Zone, please correct. Form > Location, Message: Form Zone larger than Location Zone, please correct.
		Changing to a type that does not allow an offset. The entered offset (X.XX) will be removed.	Editing the dialog or opening Validate will change certain GD&T that had an offset in previous versions and do not currently have an Offset field. (71084)
		Multiple Profile GDTs applied on same features - smaller tolerance is ignored	No action required. Review the GD&T and deactivate the required note, then re-run the Simulation. (70282)
Circularity	Error	Circularity: Spheres are not allowed.	Remove the sphere shape feature from the GD&T and select the cylindrical features of size. (71628)

Group Pattern - Position	Error	Feature Axis Direction > 90deg (affecting Pos Tol start angle)	The direction of the features are in a opposite directions. Change one of the features direction to be the same direction.

Linear Dimensions	Warning	MultiSizeGD&T on Non-Origin feature	The software is warning the user that the variation may not be what the user expects. The user may need to set the GD&T with one of the features as the origin feature. Change the type to Dimensioning Location, in the Options tab set the first or second feature as the origin.
Linear Dimensions	Error	Invalid size feature directions	The Features are created in the same direction. Change the Tolerance from Size to a Dimensioning Location tolerance, and check the origin feature in the options.
	Error	Sum of Orientation range (0.010000 mm) and Form range (0.010000 mm) should be less than Size range (0.020000 mm)	The size range should be lesser than the sum orientation and range applied to those features.
Position	Error	PosGD&T Requires SizeGD&T	The Position GD&Ton the selected features with matrial condition missing a size GD&T

Circularity	Error	Sphere is not allowed	Sphere features are not supported for Circularity
Composite Position	Warning	Composite position GD&T should use right skew or normal distribution.	Warning shows up if any distribution type is selected except for right skew and normal
Composite Profile	Warning	Composite Profile GD&T should use normal distribution	Warning shows up if any distribution type is selected except for Normal.
Perpendicularity	Error	Feature is not perpendicular to datum	The selected feature for perpendicularity is not perpendicular to the selected Datum (DRF)
Parallelism	Error	Feature is not parallel to datum	The selected feature for parallelism is not parallel to the selected Datum (DRF)

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