About the Axis of Revolution
• Use one of the following references to define an axis of revolution for a revolved feature:
◦ External reference—Use existing linear geometry:
▪ Datum axis
▪ Straight edge
▪ Straight curve
▪ Axis of a coordinate system
◦ Internal centerline—Use a centerline created in Sketcher.
▪ The centerline is automatically added to the reference collector as InternalCL.
▪ If a sketch contains more than one centerline, the first geometry centerline created is used as the axis of revolution. If the sketch does not contain a geometry centerline, the first construction centerline created is used.
▪ To specify the desired centerline to use as the axis of revolution, select it, and right-click and choose Designate Axis of Revolution.
• Creo checks for a reference to use as the axis of revolution for a revolved feature and prioritizes its default selection in this order:
◦ An axis of revolution that you designate
◦ A geometry centerline in the feature sketch
◦ A construction centerline in the feature sketch
• When you define the axis of revolution:
◦ Sketch the geometry only on one side of the axis of revolution.
◦ The axis of revolution (a geometric reference or a centerline) must lie in the sketching plane of the section.
• While defining a revolved feature, you can change the axis of revolution. For example, you can select an external axis instead of the centerline.