Required Items
Examples
ElbowArc
A sketch named ElbowArc
An arc, with dimensions named:
BendRadius@ElbowArc
BendAngle@ElbowArc
Route
A sketch:
named Route
on a plane normal to one end of the arc
A circle representing the outside diameter of the elbow, with a dimension named Diameter@Route
A dimension between the center of the circle and the center of the arc:
named BendRadius@Route
linked to BendRadius@ElbowArc
Feature
A Sweep 
using:
Route for Profile
ElbowArc for Path
The Thin Feature option to set the wall thickness
