UCS Overview

                     The user coordinate system provides an alternate movable coordinate system for coordinate entry, planes of operation, and viewing. Most AutoCAD geometric editing commands are dependent on the location and orientation of the UCS. There are a variety of ways to set the User Coordinate System using the UCS command.

1. Type              UCS at the command prompt
                    Command: UCS
                    Specify origin of UCS or [Face/NAmed/OBject/Previous/View/World/X/Y/Z] <World>: 

 Face               Aligns the UCS to the selected face of a solid object.

Named          Saves or restores a UCS.

Object           Lets you define a new UCS by pointing at an object.

Previous       Restores the previos UCS.

New               Defines a new coordinate system by one of six methods: Origin, Z Axis,3 Point, Object, Face, View X, Y, Z.

View              Establishes a new UCS whose XY plane is perpendicular to your viewing direction (e.g. parallel to your screen)

World           Restores the world UCS

X/Y/Z           Rotates the ucs around a specified axis.

UCS Toolbars

Found under the AutoCAD Classic Toolbars