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Chapter 23. Visualization > Creating Solids from 2D Polylines

Creating Solids from 2D Polylines

Let's start by drawing the cylinders and arched slot. You will want to create the primitives, or the basic features that make up the part. In this case, the primitives are the two cylinders, the arm and the reinforcing web part of the arm. Then you'll use the Boolean operations to join them together.

Example: Creating the Primitives

  1. Open the drawing ch23_01.dwg that was copied from the accompanying CD. In this example you'll create the base for the grinder vise shown in Figure 23.1.

  2. Using the polyline profile for the base, you'll extrude the polyline to form the base primitive. From the Solids toolbar, select the Extrude button shown in Figure 23.2.

    Figure 23.2. Choose the Extrude button from the Solids toolbar to give the profile thickness.

    AutoCAD displays the current Isolines setting at the command line, which indicates the number of lines that will be used to represent the solid object. A value of 4 should be sufficient for now, so select the polyline and press Enter.

Tip 226 from

Although increasing the number of isolines for a part increases the amount of detail, it also increases the amount of time needed to regenerate the object, such as when toggling from model space to paper space layout. See "Model Space and Paper Space" in Chapter 18, "Plotting and Layouts," for more information on using this feature.

This should be taken into consideration when adjusting this value and balanced between the level of detail you need shown in the drawing and the time it will take to regenerate, which mainly depends on the size of the model and the design and speed of your computer. Generally, you'll want to adjust this value when needed, setting it to a low value when you are not working on this particular part, and then increasing the number of isolines when working on or near this part.

  1. At the Specify Height of Extrusion or [Path] prompt, type 3.25 and press Enter.

  2. Type 0 at the Specify Angle of Taper for Extrusion <0> prompt and press Enter to complete the extrusion. The angle of taper allows the part to become narrower, based on the angle and thickness of the part.

  3. At this point, the polyline has been extruded into the screen, which you cannot see at this moment. Use the Viewports command to split the screen into two viewports, and then change the view in the right viewport to view the primitive from the Southeast direction. Type Viewports at the command line to open the Viewports dialog box.

→ See Chapter 11, "Viewing the Drawing," for more information on working with viewports.

  1. Select Two: Vertical from the Standard Viewports list to create two vertical viewports. Choose 3D from the Setup list, and then from the Change to View list click SE Isometric. Click the OK button to create the viewports. You screen should look similar to the one shown in Figure 23.3.

    Figure 23.3. To assist you in drawing in three dimensions you can create two viewports from which to work from and view your model.

After your drawing viewports have been set up, let's talk briefly about the UCS, or User Coordinate System, discussed in the next section.



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