Autodesk AUTOCAD 2006, Command Reference Manual, Page: 1011 / 1490

path curve
axis of revolution
The path curve is swept about the selected axis to define the surface. The path
curve defines the N direction of the surface mesh. Selecting a circle or a closed
polyline as the path curve closes the mesh in the N direction.
The vector from a polyline’s first vertex to its last vertex determines the rotation
axis. Any intermediate vertices are ignored. The axis of revolution determines
the M direction of the mesh.
Specify start angle <0>: Enter a value or press ENTER
Specify included angle (+=ccw, -=cw) <360>: Enter a value or press ENTER
Included Angle
Specifies how far about the axis of revolution the surface extends.
Start Angle
If set to a nonzero value, begins the surface of revolution at an offset from
the generating path curve.
Specifying a start angle begins the surface of revolution at an offset from the
generating path curve. The included angle is the distance through which the
path curve is swept.
Entering an included angle that is less than a full circle prevents the circle
from closing.
Image Specifications Dialog Box | 987