Weighting constraints

Use the weight values in a constraint to moderate a source object’s influence on the constrained object.

NoteWhile all constraints can be weighted, individual weight settings apply only to the Aim, Parent/Child, Rotation, Scale, and Chain IK constraints. See Aim constraint settings, Parent-child constraint settings, Rotation constraint settings, Scale constraint settings, and Chain IK constraint settings for information on these constraints’ other settings.

To weight source objects:

Double-click to select the constraint in the Scene browser. The constraint settings display in the Properties or Navigator window.
Adjust the Weight values until you achieve the desired effect.

See Blending constraints for more on changing weight values.