AutoCAD 2002 Bible

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The drawing used in the following Step-by-Step exercise on drawing revolved surfaces, ab23-d.dwg, is in the Drawings folder of the AutoCAD 2002 Bible CD-ROM.

Step-by-Step: Drawing Revolved Surfaces

1.    Open ab23-d.dwg from the CD-ROM.

2.    Save it as ab23-4.dwg in your AutoCAD Bible folder. The path curve and axis are already drawn in a UCS revolved around the X axis of the World Coordinate System (WCS) by 90 degrees.

4.    At the Select object to revolve: prompt, select the polyline to the right.

5.    At the Select object that defines the axis of revolution: prompt, select the line.

6.    At the Specify start angle <0>: prompt, press Enter. At the Specify included angle (+=ccw, -=cw) <360>: prompt, press Enter to revolve the path curve in a full circle.

7.    Choose Tools О New UCS О World to return to the WCS.

8.    Choose Top View from the View flyout of the Standard toolbar to return to plan view of the WCS.

9.    Choose SE Isometric View from the View flyout of the Standard toolbar.

10.    Choose View О Hide to see the shape more clearly.

11.    Save your drawing. It should look like Figure 23-28.

Drawing an Extruded Surface

To extrude means to thrust out. In AutoCAD, it refers to creating a 3D object from a 2D object. The TABSURF command takes an outline, or profile, which AutoCAD calls a path curve, and extrudes it along a vector that defines the direction and distance of the extrusion. TABSURF creates a 3D polyline mesh. The type of surface created is called a tabulated surface. Figure 23-29 shows two examples of extruded surfaces.

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