How to use User & World Coordinate Systems UCS WCS

Here is how to use CS WCS (User & World Coordinate Systems) in AutoCAD

The World Coordinate System (WCS) is the default coordinate system used by AutoCAD.

the WCS will be sufficient for most of your 2D drafting needs and this is the only coordinate system used in this course.
you know that the current coordinate system is the WCS when you see the letter W in the UCS icon.

If you plan to work with 3D drawings or with drawings that are oriented at an odd angle (e.g. site plans not square to the world)

then you may want to learn how to create and manage your own User Coordinate System (UCS).
you know the current coordinate system is a UCS when there is no W in the UCS icon.

To learn more about creating and managing your own UCS use the AutoCAD Help utility

Create a drawing from scratch using English default settings and save this new drawing as Cube.dwg in your personal folder.

use a method of your choice to create the LINEs shown in the illustration below.

Create a drawing from scratch using English default settings and save this drawing as Octahedron.dwg in your personal folder.

use a method of your choice to create the LINEs shown in the illustration below.

Create a new drawing from scratch using English default settings and save this drawing as Elevation.dwg in your personal folder.

use a method of your choice to create the LINEs shown in the illustration below.

This drawing will be easier to complete if you use the Units command & select Architectural as the type of units for length.

then you could enter distances using feet and inches.
for example, with Architectural units you could type 10’6 for 10  feet + 6 inches = 126 inches (one drawing unit equals one inch).

Open a drawing called T104_3.dwg in your personal folder.

use the Line command to connect the osnap points from the center of the inner CIRCLE to the osnap points shown.
the appropriate osnap mode to use is indicated for each LINE as well as where to hold your crosshairs for these osnap points.