AutoCAD 2008 User's Guide > Create and Modify Objects > Use Precision Tools > Use Coordinates and Coordinate Systems (UCS) > Specify Workplanes in 3D (UCS) > Control the User Coordinate System in 3D > 
Control the User Coordinate System in 3D
Concept Procedure Quick Reference
 
 
 

Z axis

  1. Click Tools menu New UCS Z Axis Vector.At the Command prompt, enter ucs.
  2. Specify a point for the new origin.

    The UCS origin (0,0,0) is redefined at the point you specify.

  3. Specify a point that lies on the positive Z axis.

 Toolbar: UCS 
 Command entry: UCS