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Autocad for dummies - Byrnes D.

Byrnes D. Autocad for dummies - Wiley publishing, 2007. - 435 p.
Download (direct link): autocad2006.pdf
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AutoCAD draws the nut, as shown in Figure 3-6. It’s on the Nuts layer and inherits that layer’s red color.
Occasionally, ortho and running object snaps interfere with drafting in AutoCAD. You can disable both features by clicking their status bar buttons.
9. Turn off ortho mode and running object snaps by clicking the ORTHO and OSNAP buttons on the status bar until they look popped out and
you see <Ortho off> and <Osnap off> on the command line.
10. Press Ctrl+S to save the drawing.

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Chapter 3: A Lap Around the CAD Track
Not much of a base plate yet, is it? But don’t worry — we cover creating more nuts and bolts with editing commands later in this chapter. If your brain is feeling full, now is a good time to take a break and go look out the window. If you exit AutoCAD, just restart the program and reopen your drawing when you’re ready to continue.
Get a Closer Look with Zoom and Pan
The example drawing in this chapter is pretty uncluttered and small, but most real CAD drawings are neither. Technical drawings usually are jam-packed with lines, text, and dimensions. CAD drawings often get plotted on sheets of paper that measure two to three feet on a side — that’s in the hundreds of millimeters, for you metric mavens. Anyone who owns a monitor that large probably can afford to hire a whole room of drafters and, therefore, isn’t reading this book. The rest of us need to zoom and pan in our drawings — a lot. We cover zooming and panning in detail in Chapter 8. Quick definitions should suffice for now. Zoom means changing the magnification of the display. When you zoom in, you move closer to the drawing objects so you can see detail, and when you zoom out, you move farther away so you can see more of the drawing area. Pan means moving from one area to another without changing the magnification. If you’ve used the scroll bars in any application, you’ve panned the display.
Zooming and panning frequently enables you to see the details better, draw more confidently (because you can see what you’re doing), and edit more quickly (because object selection is easier when a zillion objects aren’t on the screen).
Fortunately, zooming and panning in AutoCAD is as simple as it is necessary. The following steps describe how to use AutoCAD’s Zoom and Pan Realtime feature, which is pretty easy to operate and provides a lot of flexibility. Chapter 8 covers additional zoom and pan options.
To zoom and pan in your drawing, follow these steps:
1. Click the Zoom Realtime button (the one that looks like a magnifying glass with a plus/minus sign next to it) on the Standard toolbar.
The Realtime option of the ZOOM (Z) command starts. The crosshairs change to a magnifying glass and AutoCAD prompts you at the command line:
Press ESC or ENTER to exit, or right-click to display shortcut menu.
60 Part I: AutoCAD 101
Figure 3-7:
2. Move the crosshairs near the middle of the screen, press and hold the left mouse button, and drag the crosshairs up and down until the plate almost fills the screen.
As you can see, dragging up increases the zoom magnification and dragging down decreases it.
3. Right-click in the drawing area to display the Zoom/Pan Realtime menu, shown in Figure 3-7, and choose Pan from the menu.
The crosshairs change to a hand.
4. Click and drag to pan the drawing until the plate is more or less centered in the drawing area.
You can use the right-click menu to toggle back and forth between Zoom and Pan as many times as you like. If you get lost, choose Zoom Original or Zoom Extents in order to return to a recognizable view.
5. Right-click in the drawing area and choose Exit from the Zoom/Pan Realtime menu.
The hand cursor returns to the normal AutoCAD crosshairs.
Chapter 3: A Lap Around the CAD Track 61
Modify to Make It Merrier
When you have a better view of your base plate, you can edit the objects on it more easily. In the following sections, you use the ARRAY (AR) command to add more anchor bolts, the STRETCH (S) command to change the shape of the plate, and the HATCH (H) command to add crosshatching to the column.
Hooray for array
Using the ARRAY command is a great way to generate a bunch of new objects at regular spacings from existing objects. The array pattern can be either rectangular (that is, columns and rows of objects) or polar (in a circle around a center point, like the spokes of a wheel around its hub). In this example, you use a rectangular array to create three additional anchor bolts:
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