Create and Save AutoCAD drawing files ? Use the AutoCAD visual reference commands ? Draw, using the LINE and CIRCLE
commands ? Use the ERASE command ? Define Positions using the Basic Entry methods ? Use the AutoCAD Pan Realtime option. In order to become effective in using a CAD system, we must learn to create geometric entities quickly and accurately. In learning to use a CAD system, lines and circles are the first two, and perhaps the most important two, geometric entities that one should master the skills of creating and modifying. Note that AutoCAD automatically assigns generic name, Drawing X, as new drawings are created. In our example, AutoCAD opened the graphics window using the default system units and assigned the drawing name Drawing1. Drawing Units Setup Every object we construct in a CAD system is measured in units. We should determine the value of the units within the CAD system before creating the first geometric entities. Drawing Area Setup Next, we will set up the Drawing Limits; setting the Drawing Limits controls the extents of the display of the grid. It also serves as a visual reference that marks the working area. On your own, move the graphic cursor near the upper-right comer inside the drawing area and note that the drawing area is unchanged. (The Drawing Limits command is used to set the drawing area, but the display will not be adjusted until a display command is used.). Visual reference, Using the buttons is a quick and easy way to make changes to these drawing aid options. The CAD Database and the User Coordinate System.
link dowload:http://www.acaddemo.com/pdfsample/978-1-58503-361-4-1.pdf
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