TYPES OF CONSTRAINTS

Distance
Creates a distance dimension between elements.

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Length
Creates a length dimension on an element.

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Angle
Creates an angular dimension between two linear elements

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Radius/Diameter
Creates a radius dimension on an arc and a diameter on a circle.

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Semimajor Axis
Creates a semi-major dimension on an ellipse.

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Semiminor Axis
Creates a semi-minor dimension on an ellipse.
Symmetry
Creates symmetric geometry about a reference line or axis. The first two elements selected must be the symmetric geometry. The third object is the symmetry line.

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Midpoint
Creates a midpoint constraint between a point and a line.

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Equidistant Point
Sets two points to be the same distance from a reference point. The reference point is the last point selected.


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Fix
Fixes the element at its current point in space.
Coincidence
Makes two points coincident.

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If you select two lines, CATIA makes them collinear. If you select two arcs, CATIA makes them concentric and equal in radius.
Concentricity
Makes two arcs or circles concentric.

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Tangency
Creates a tangency constraint between two curves or a curve and a line.

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Parallelism
Sets two lines parallel to each other.

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Perpendicular
Sets two lines perpendicular to each other.

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Horizontal
Sets a line to be horizontal.

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The horizontal direction depends on the H axis of the sketch.
Vertical
Sets a line to be vertical.
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The vertical direction depends on the V axis of the sketch.
Tips
• You can double-click a constraint icon to make the command automatically repeat. Select another command, like Select, to stop.
• Use SmartPicks when creating geometry to save you from having to explicitly specify the constraints.
• You can activate as many constraints as necessary on the Constraint Definition dialog at one time. As you select the constraint type the geometry updates in the Graphics window. If the constraint is not correct, you can deactivate it, but the geometry will not return to its previous location unless you cancel the dialog