AutoCAD 2002 Bible

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9.    Repeat the CIRCLE command. At the Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: prompt, choose the Center object snapJand pickQ. At the Specify radius of circle or [Diameter]: prompt, type .05 J.


10.    Repeat Step 9 to create a circle inside the circle whose center is at О and whose radius is 0.05.


11.    Repeat the CIRCLE command. At the Specify center point for circle or [3P/2P/Ttr (tan tan radius)]: prompt, pick the endpoint at ф. At the Specify radius of circle or [Diameter]: prompt, pick the endpoint at @.


12.    Repeat Step 11, choosing the endpoint at # for the center of the circle and the endpoint at $ for its radius, as shown in Figure 7-1.


13.    Save your drawing. It should look like Figure 7-2.

Figure 7-2: The completed air compressor


Thanks to the U.S. Army Corps of Engineers at Vicksburg, Mississippi, for this drawing. They maintain a Web site of drawings at http://cadlib.wes.army.mil.



It may have occurred to you that this task would have been easier if you could simply have copied one circle to another location instead of creating each circle from scratch. I cover copying in Chapter 9.

Drawing Arcs


An arc is a portion of a circle. Therefore, to define an arc, you not only have to define a circle — for example, by specifying a center and a radius — but also you must define the start and endpoints of the arc. You can do this in many ways. AutoCAD offers several methods of defining an arc. The method you pick depends on the information you have about the arc you want to draw.

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