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Radius

Angle

Sketcher

Description

The Sketcher ConstrainDiameter tool fixes the diameter of circles and arcs. It cannot be used for B-spline weight circles.

Usage

See also: Drawing aids.

Continue mode

1. Make sure there is no selection.
2. There are several ways to invoke the tool:
   • introduced in 1.0: If the Dimensioning constraints preference is set to Single tool (default): press the down arrow to the right of the button and select the Constrain diameter option from the dropdown.
   • If this preference has a different value (and in 0.21 and below): press the Constrain diameter button.
   • Select the Sketch → Sketcher constraints → Constrain diameter option from the menu.
   • introduced in 1.0: Right-click in the 3D view and select the Dimension → Constrain diameter option from the context menu.
   • Use the keyboard shortcut: K then O.
3. The cursor changes to a cross with the tool icon.
4. Select the edge of a circle or arc.
5. If a driving dimensional constraint is created, depending on the preferences, a dialog opens to edit its value.
6. A constraint is added.
7. Optionally keep creating constraints.
8. To finish, right-click or press Esc, or start another geometry or constraint creation tool.

Run-once mode

1. Select the edge of one or more circles or arcs.
2. Invoke the tool as explained above.
3. Optionally edit the constraint value.
4. Depending on the selection one or more constraints are added, see Notes.

Notes

• If driving constraints are created and multiple elements that are not external geometry have been pre-selected, only the first of those receives a dimensional constraint, while between the first and the others Equal constrains are applied.

Scripting

Sketch.addConstraint(Sketcher.Constraint('Diameter', ArcOrCircle, App.Units.Quantity('123.0 mm')))

The Sketcher scripting page explains the values which can be used for ArcOrCircle, and contains further examples on how to create constraints from Python scripts.

Radius

Angle

Sketcher