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The drawing used in the following Step-by-Step exercise on chamfering solids, ab24-i.dwg, is in the Drawings folder of the AutoCAD 2002 Bible CD-ROM.
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Step-by-Step: Chamfering Solids
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1. Open ab24-i.dwg from the CD-ROM. 2. Save the file as ab24-12.dwg in your AutoCAD Bible folder. This is a simple box with dimensions of 233 102 12 millimeters, as shown in Figure 24-38.
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24 Creating Solids and Editing in 3D
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2 Figure 24-38: You can chamfer this solid box to create a new shape.
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3. Choose Chamfer from the Modify toolbar. Follow the prompts:
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Select first line or [Polyline/Distance/Angle/Trim/Method]: Pick the edge at 1 in Figure 24-38. Base surface selection... Enter surface selection option [Next/OK (current)] <OK>: Specify base surface chamfer distance <0.5000>: 30 Specify other surface chamfer distance <0.5000>: 30 Select an edge or [Loop]: Pick 1. Select an edge or [Loop]:
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You can t properly see the chamfer because of the viewpoint. You change the viewpoint at the end of the exercise. 4. Repeat the CHAMFER command. Do the exact same operation as in Step 3, but pick 2. 5. Repeat the CHAMFER command. Follow the prompts:
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Select first line or [Polyline/Distance/Angle/Trim/Method]: Pick the edge at 3. Base surface selection... Enter surface selection option [Next/OK (current)] <OK>: Make sure the surface indicated by 4 is highlighted. If not, type n . Then press Enter again. Specify base surface chamfer distance <30.0000>: 233 Specify other surface chamfer distance <30.0000>: 40 Select an edge or [Loop]: Pick 3. Select an edge or [Loop]:
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Part IV Drawing in Three Dimensions
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6. Choose Top View from the Viewpoints flyout on the Standard toolbar. This shows you the shape in profile. 7. Save your drawing. It should look like Figure 24-39.
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Figure 24-39: The completed solid. Compare it to the model in Figure 24-1.
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The EXPLODE command has a particular effect that varies according to the type of 3D object. Table 24-4 lists the effects of exploding 3D objects.
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Table 24-4 Using EXPLODE on 3D Objects
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Object Solids Bodies Polyface meshes Polygon meshes Polylines with thickness Result Flat surfaces become regions. Curved surfaces become bodies. Curved surfaces become single-surface bodies. Flat bodies become regions or curves. 3D faces. 3D faces. Lines.
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A body is a freeform solid. You cannot directly create a body. AutoCAD uses bodies when 3D models do not fit into any other object type.
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24 Creating Solids and Editing in 3D
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ACIS and stereolithography (.stl) are two file formats especially applicable to 3D models. 27 explains how to export drawings in these formats.
Editing Solids
Prior to AutoCAD 2000, direct editing of solids was very limited. You could chamfer, fillet, slice, or explode a solid. You could also use UNION, SUBTRACT, and INTERSECT. Other editing commands did not actually modify the solids. AutoCAD 2000 introduced SOLIDEDIT to directly edit solids. This command has so many options that it might as well be several commands. SOLIDEDIT offers three major types of solid editing: Faces: A number of options enable you to edit the faces of solids. You can extrude, move, rotate, offset, taper, delete, copy, and color (assign a color to) faces. Edges: You can color and copy edges. Bodies: The body options apply to solids as a whole. You can imprint, separate, shell, clean, and check solids. These options are more easily done than said. The easiest way to use SOLIDEDIT is to open the Edit Solids toolbar, shown in Figure 24-40. The next three sections explain how to edit faces, edges, and bodies.
Editing faces
A face is a surface on a solid. A face can be either flat or curved. For example, a hole in a block is a face and many of the face editing operations work well to modify holes. Of course, you can edit an outer face of a surface as well. The SOLIDEDIT command supports several methods of selecting a face or faces. You are accustomed (by now) to selecting a solid by picking one of its edges. However, an edge borders on two faces, and when you pick an edge AutoCAD highlights both its adjoining faces, as shown in Figure 24-41. Sometimes, picking a face on an edge works for example, when you want to pick the entire face represented by a hole. For other situations, to enable you to pick only one face, you can use the boundary set method, by picking within the closed boundary of a face. You can also use a crossing window, crossing polygon, or fence to select a face. For these three latter selection methods, you need to type c, cp, or f, respectively, and then press Enter.