Creating Solids and Surfaces from 2D - Autodesk AutoCAD 2013 Practical 3D Drafting and Design - page 103

The other command options, either for axis or revolution angle definition, are:
• Object : We can select an object to define the axis of revolution. Eligible
objects are lines, segments of polylines, and edges of solids or surfaces
(if the Ctrl key is pressed).
• X/Y/Z : The axis of revolution is defined by the positive direction of the X,
Y, or Z axis of the current coordinate system.
• STart angle : The revolution object starts at this angle from the section
object.
• Reverse : It allows us to reverse the direction angle. It is similar to spe-
cifying a negative angle value.
Note
An interesting curiosity is that when the command prompts for the angle of re-
volution and if we press the S key, it applies an angle of 270 degrees.