GD & T¶

Click Dimension in the top navigation bar to enter the dimension module, where you can inspect Flatness, Straightness, Circularity, Cylindricity, Parallelism, Perpendicularity, Angularity, Position, Coaxiality or Symmetry, Surface Profile, Line Profile, Circular Runout or Total Runout.

Note

Support directly clicking on the model to create new features or feature pairs and datums for inspection.
If the features used for dimension are used for pairing or are deleted/replaced, their dimension items will become invalid.

Shape Tolerance¶

Select Flatness, Straightness, Circularity or Cylindricity to open the corresponding window.

Note

When performing shape tolerance inspection, the feature to be measured can only have measurement values.

Flatness Straightness Circularity Cylindricity

Flatness inspection is used to control the deviation of a feature from a perfect plane.

Feature Types Available for Measurement

Plane

Straightness inspection is used to control the deviation of a feature from a straight line.

Feature Types Available for Measurement

Line, Cylinder, Cone

Circularity inspection is used to control the deviation of a feature from a perfect circle.

Feature Types Available for Measurement

Circle, Cylinder, Cone

Cylindricity inspection is used to control the deviation of a feature from a perfect cylinder.

Feature Types Available for Measurement

Cylinder
Select the feature to be measured, and set the tolerance (0 ~ 100).
Click Confirm, the software will automatically calculate and display annotation labels in the 3D scene: Green indicates that the deviation is within the tolerance range, while red indicates that the deviation is outside the tolerance range.
The inspection object will be displayed in the dimension module in the left-side tree view.

Position Tolerance¶

Select Parallelism, Perpendicularity, Angularity, Position, Coaxiality or Symmetry to open the corresponding window.

For inspecting Parallelism, Perpendicularity, Angularity, Coaxiality or Symmetry, select the feature to be measured and the datum, and set the tolerance (0 ~ 100); for inspecting Position, you also need to select the entity status and the tolerance zone shape.

Note

When inspecting Parallelism, Perpendicularity, and Angularity, the first datum cannot be a point or sphere feature.
When inspecting Parallelism, Perpendicularity, and Coaxiality, the feature to be measured can only have measurement values; when inspecting Angularity and Position, the feature to be measured must contain both reference values and measurement values.
When inspecting Parallelism and Perpendicularity, if the feature to be measured only has measurement values and only one datum is selected, a feature with only measurement values can be selected as the datum.
When inspecting Parallelism and Perpendicularity, if the feature to be measured/datum feature carries an entity modifier symbol, the feature to be measured/datum feature must have reference values.
When inspecting Parallelism, Perpendicularity, Angularity, and Position, the feature to be measured and datum support entity modifiers: represents Maximum Material Condition; represents Least Material Condition.

Parallelism

Perpendicularity

Angularity

Position

Coaxiality

Symmetry

Parallelism inspection is used to control the directional deviation of a feature from being parallel to a specific datum.

Feature Types Available for Measurement	Datum Feature Types
Line, Cylinder, Cone, Plane, Circle, Plate	Point, Line, Plane, Circle, Sphere, Cylinder, Cone, Slot, Regular Polygon, Rectangle, Plate

Perpendicularity inspection is used to control the deviation of a feature from a 90° angle to a specific datum.

Feature Types Available for Measurement	Datum Feature Types
Line, Cylinder, Cone, Plane, Circle, Plate	Point, Line, Plane, Circle, Sphere, Cylinder, Cone, Slot, Regular Polygon, Rectangle, Plate

Angularity inspection is used to control the deviation of a feature from a non-90° angle to a specific datum.

Feature Types Available for Measurement	Datum Feature Types
Line, Cylinder, Cone, Plane, Circle, Plate	Point, Line, Plane, Circle, Sphere, Cylinder, Cone, Slot, Regular Polygon, Rectangle, Plate

Position inspection is used to control the positional deviation of a feature relative to a datum or theoretically correct position.

Feature Types Available for Measurement	Datum Feature Types
Point, Sphere, Line, Cylinder, Cone, Circle, Slot, Regular Polygon, Rectangle, Plate	Point, Line, Plane, Circle, Sphere, Cylinder, Cone, Slot, Regular Polygon, Rectangle, Plate

Measured Feature Type	Available Tolerance Feature Types
Point	Spherical, slab-like
Sphere	Spherical, slab-like
Line	Cylindrical, slab-like
Cylinder	Cylindrical, slab-like
Cone	Cylindrical, slab-like
Circle	Cylindrical, slab-like
Slot	Cylindrical, slab-like
Regular Polygon	Cylindrical, slab-like
Rectangle	Cylindrical, slab-like
Plate	Default slab-like

Coaxiality inspection is used to control the deviation of a feature from a specific datum.

Feature Types Available for Measurement	Datum Feature Types
Point, Sphere, Circle, Slot, Regular Polygon, Rectangle, Line, Cylinder, Cone	Line, Cylinder, Cone, Circle, Slot, Regular Polygon, Rectangle

Symmetry inspection is used to control the symmetrical deviation of a central element relative to the datum center plane.

Feature Types Available for Measurement	Datum Feature Types
Plate, Plate Array	Plane, Plate

Click Confirm, the software will automatically calculate and display annotation labels in the 3D scene: Green indicates that the deviation is within the tolerance range, while red indicates that the deviation is outside the tolerance range.
The inspection object will be displayed in the dimension module in the left-side tree view.

Profile Tolerance¶

Surface Profile¶

Surface profile inspection is used to control the shape deviation of the actual surface contour relative to the theoretical contour.

Note

When performing surface profile inspection, the feature to be measured must contain both reference values and measurement values.

(Optional) Right-click on a feature group in the left-side tree view, or hold down Ctrl while selecting multiple feature groups. Then click Pattern in the context menu to create a pattern containing one or more feature pairs.

Note

The features to be measured can include planes, cylinders, cones, spheres, surfaces, plane arrays, cylinder arrays, cone arrays, sphere arrays, and surface arrays.
Select Surface Profile to open the corresponding window.
Select the feature to be measured and the tolerance symmetry, and set the tolerance and datum.
Note
- If you select the tolerance symmetry as , you can set asymmetric tolerance.
- Datum features can include points, lines, planes, circles, spheres, cylinders, cones, slots, regular polygons, rectangles, and plates.
- Datum features support entity modifiers: represents Maximum Material Condition; represents Least Material Condition.
Click Confirm, the software will automatically calculate and display annotation labels in the 3D scene: Green indicates that the deviation is within the tolerance range, while red indicates that the deviation is outside the tolerance range.
The inspection object will be displayed in the dimension module in the left-side tree view.

Line Profile¶

Line profile inspection is used to control the shape deviation of the actual curve contour relative to the theoretical contour.

Select Line Profile to open the corresponding window.
Select the feature to be measured and set the tolerance and datum.
Note
- The features to be measured can include polylines, lines, circles, slots, regular polygons, and rectangles.
- Datums can include points, lines, planes, circles, spheres, cylinders, cones, slots, regular polygons, rectangles, and plates.
- Datum features support entity modifiers: represents Maximum Material Condition; represents Least Material Condition.
Click Confirm, the software will automatically calculate and display annotation labels in the 3D scene: Green indicates that the deviation is within the tolerance range, while red indicates that the deviation is outside the tolerance range.
The inspection object will be displayed in the dimension module in the left-side tree view.

Runout Tolerance¶

This function can be used to inspect the runout tolerance of circular runout and total runout.

Terminology Explanation¶

Runout Tolerance: The degree of variation of the measured feature relative to the reference when rotating components around the reference axis, which can be divided into circular runout and total runout.
Circular Runout: The maximum allowable variation of the measured feature when it is coaxial with the reference axis during rotation.
Section Number: The number of sections taken from the object to be measured.
Total Runout: The amount of runout along the entire measured surface when the part continuously rotates around the reference axis.

Operation Instructions¶

Select the detection type as Circular Runout or Total Runout.
Note
- Circular Runout: Circular runout inspection is used to control the radial or face runout amount when elements rotate around the datum axis for one revolution.
- Total Runout: Total runout inspection is used to control the comprehensive shape and position deviation of the entire surface when elements rotate around the datum axis.
In the settings window, select the feature, datum, and tolerance (0 ~ 100); for circular runout, you also need to input the section number.
Note
- The features to be measured can include planes, cylinders, and cones.
- The datum can include lines, cylinders, cones, circles, slots, regular polygons, and rectangular features.
Click Confirm, the software will automatically calculate and display annotation labels in the 3D scene: Green indicates that the deviation is within the tolerance range, while red indicates that the deviation is outside the tolerance range.
The inspection object will be displayed in the dimension module in the left-side tree view.